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1

Rapid Site Preparation for Turbojet VTOL Aircraft.  

National Technical Information Service (NTIS)

A sprayable, rapid-curing, light-weight, low-cost material system for use as a remote landing and takeoff site for turbojet VTOL aircraft was developed. The material system was composed of a chlorinated polyester resin system modified with temperature res...

J. E. Butler G. F. Thomas

1964-01-01

2

The Application of Flight and Simulator Testing to VTOL Aircraft Handling Qualities Specifications.  

National Technical Information Service (NTIS)

Several well defined handling qualities limitations were encountered during the flight tests of the X-14A research airplane and several other VTOL aircraft while hovering in visual flight conditions. The purpose of the paper is to describe some of these l...

F. J. Drinkwater L. S. Rolls

1969-01-01

3

The Use of an Aircraft Test Stand for VTOL Handling Qualities Studies.  

National Technical Information Service (NTIS)

The VTOL flight tests stand for testing control concepts on the X-14B VSS aircraft in hover, is described. This stand permits realistic and safe piloted evaluation and checkout of various control systems and of parameter variations within each system to d...

F. A. Pauli L. D. Corliss S. D. Selan R. M. Gerdes T. D. Gossett

1974-01-01

4

Comprehensive Mission Analysis Computer Program (Comap) for VTOL Aircraft.  

National Technical Information Service (NTIS)

COMAP is a Comprehensive Mission Analysis Program. Its purpose is to facilitate the calculation of mission performance and to establish required engine size for rotary wing aircraft. The program is available for use on the IBM 7090 and UNIVAC 1108 electro...

M. Chrissanthis

1968-01-01

5

Real-time embedded control system for VTOL aircrafts: Application to stabilize a quad-rotor helicopter  

Microsoft Academic Search

In this paper, we present the design of an autopilot embedded control system for VTOL aircrafts using low cost sensors. The embedded control system uses parallel processing architecture. In addition, multitasking software is used to implement the data acquisition, control law computation, and correction output to get the desired set point. The control law can be easily tuning to improve

David Lara; Anand Sanchez; Rogelio Lozano; P. Castillo

2006-01-01

6

An Experimental Study of Pilot Visibility from a VTOL Aircraft in Overwater Hover.  

National Technical Information Service (NTIS)

A test program which investigated in small scale the phenomenon of spray generation and the resulting impairment to pilot vision when an in-line VTOL configuration, such as the LTV XC-142A, is in low-altitude overwater hover is described. Also given are t...

G. Kurylowich A. Ritter

1969-01-01

7

Computer Aided Development and Simulation of a Remote Control VTOL Tiltwing Model Aircraft  

Microsoft Academic Search

This paper describes the computer aided development of a remote control tiltwing scale aircraft. Tiltwings —even scale models—\\u000a are difficult to fly by human pilots due to their instability and the different flying modes they exhibit. For this reason\\u000a a complex flight simulation and training environment and an onboard control system (fly-by-wire) that increases stability\\u000a have been developed. Modular design,

A. Pérez De Madrid; P. Ruipérez; M. Romero; C. Mañoso; R. Hernández

2007-01-01

8

COTS approach to a utility VTOL UAV  

Microsoft Academic Search

Many UAVs are in the market place but few are very profitable. After studying the lessons learned form our predecessors, a commercial off the shelf approach was chosen to meet the price performance challenge. A multi-mission capable aircraft was chosen to provide exposure to the widest possible market. Using an analysis tool developed for DARPA, the Vigilante VTOL UAV was

Jay R. Snyder

1998-01-01

9

COTS approach to a utility VTOL UAV  

NASA Astrophysics Data System (ADS)

Many UAVs are in the market place but few are very profitable. After studying the lessons learned form our predecessors, a commercial off the shelf approach was chosen to meet the price performance challenge. A multi-mission capable aircraft was chosen to provide exposure to the widest possible market. Using an analysis tool developed for DARPA, the Vigilante VTOL UAV was successfully competed against both Outrider and Predator.

Snyder, Jay R.

1998-11-01

10

A hovering control strategy for a tail-sitter VTOL UAV that increases stability against large disturbance  

Microsoft Academic Search

The application range of UAVs (unmanned aerial vehicles) is expanding along with performance upgrades. Vertical take-off and landing (VTOL) aircraft has the merits of both fixed-wing and rotary-wing aircraft. Tail-sitting is the simplest way for the VTOL maneuver since it does not need extra actuators. However, conventional hovering control for a tail-sitter UAV is not robust enough against large disturbance

Takaaki Matsumoto; Koichi Kita; Ren Suzuki; Atsushi Oosedo; Kenta Go; Yuta Hoshino; Atsushi Konno; Masaru Uchiyama

2010-01-01

11

Preliminary Study of an Integral Fan Lift/Cruise Engine for a 100 Passenger VTOL Transport.  

National Technical Information Service (NTIS)

A simplified mission analysis was performed to determine an optimum engine cycle for a 100-passenger VTOL transport with a range of 500 statute miles. The aircraft had a total of eight integral fan lift engines, three of which serve as cruise engines. Fan...

K. C. Civinskas

1973-01-01

12

Development and Testing of a VTOL UAV.  

National Technical Information Service (NTIS)

The purpose of this project was to develop a testing platform to prepare a Vertical Takeoff and Landing Unmanned Air Vehicle (VTOL UAV) for fully independent flight tests. Other preparations for flight included extensive engine thrust and endurance testin...

A. L. Cibula

1995-01-01

13

Autonomously Flying VTOL-Robots: Modeling and Control  

Microsoft Academic Search

In this paper an approach for control of autonomously flying robots with vertical take off and landing capabilities (VTOL) is presented. After reviewing that the motion description for different VTOL-robots is very similar, the general control scheme for VTOL-robots is presented. This scheme is based on linearisation and decoupling using inversion of the system model blocks. To compensate the model

Konstantin Kondak; Markus Bernard; Nicolas Meyer; Günter Hommel

2007-01-01

14

Design of a new VTOL UAV by combining cycloidal blades and FanWing propellers  

NASA Astrophysics Data System (ADS)

Though the propelling principles of Cycloidal Blades and FanWing propellers are totally different, their structures are similar. Therefore, it is possible to develop an aircraft which combines both types of the propulsion modes of Cyclogyro and FanWing aircrafts. For this kind of aircraft, Cycloidal Blades Mode provides capabilities of Vertical Take-Off and Landing, Instantly Alterable Vector Thrusting, and Low Noise. The FanWing Mode provides capabilities of High Efficiency, Energy-Saving, and Cannot-Stall Low-Speed Cruising. Besides, because both of these propellers are observably better than conventional screw propeller in terms of efficiency, so this type of VTOL UAV could fly with Long Endurance. Furthermore, the usage of flying-wing takes advantage of high structure utilization and high aerodynamic efficiency, eliminates the interference of fuselage and tail, and overcomes flying wing's shortcomings of pitching direction instability and difficulty of control. A new magnetic suspension track-type cycloidal propulsion system is also presented in the paper to solve problems of heavy structure, high mechanical resistance, and low reliability in the traditional cycloidal propellers. The further purpose of this design is to trying to make long-endurance VTOL aircraft and Practical Flying Cars possible in reality, and to bring a new era to the aviation industry.

Li, Daizong

15

Aircraft  

SciTech Connect

This disclosure provides a solar rechargeable aircraft that is inexpensive to produce, is steerable, and can remain airborne almost indefinitely. The preferred aircraft is a span-loaded flying wing, having no fuselage or rudder. Travelling at relatively slow speeds, and having a two-hundred foot wingspan that mounts photovoltaic cells on most all of the wing's top surface, the aircraft uses only differential thrust of its eight propellers to turn. Each of five sections of the wing has one or more engines and photovoltaic arrays, and produces its own lift independent of the other sections, to avoid loading them. Five two-sided photovoltaic arrays, in all, are mounted on the wing, and receive photovoltaic energy both incident on top of the wing, and which is incident also from below, through a bottom, transparent surface. The aircraft is capable of a top speed of about ninety miles per hour, which enables the aircraft to attain and can continuously maintain altitudes of up to sixty-five thousand feet. Regenerative fuel cells in the wing store excess electricity for use at night, such that the aircraft can sustain its elevation indefinitely. A main spar of the wing doubles as a pressure vessel that houses hydrogen and oxygen gasses for use in the regenerative fuel cell. The aircraft has a wide variety of applications, which include weather monitoring and atmospheric testing, communications, surveillance, and other applications as well.

Hibbs, Bart D. (1732 N. Grand Oaks, Altadena, CA 91001); Lissaman, Peter B. S. (3276 Rubio Canyon Rd., Altadena, CA 91001); Morgan, Walter R. (3217 Amarillo Ave., Simi Valley, CA 93063); Radkey, Robert L. (70 Eddystone Ct., Redwood City, CA 94065)

1998-01-01

16

Synthesis of Hover Autopilots for Rotary-Wing VTOL Aircraft.  

National Technical Information Service (NTIS)

The practical situation is considered where imperfect information on only a few rotor and fuselage state variables is available. Filters are designed to estimate all the state variables from noisy measurements of fuselage pitch/roll angles and from noisy ...

W. E. Hall A. E. Bryson

1972-01-01

17

Aircraft.  

National Technical Information Service (NTIS)

The aircraft is a large ship designed for passenger or cargo transportation. The structure includes a long cigar-shaped fuselage, a delta-shaped supportingcontrol structure aft of the flight cabin, delta-shaped wing structure and tail structure. Four engi...

A. E. Anderson W. L. Cook J. C. Daugherty J. L. Jones D. G. Koenig

1965-01-01

18

Nonlinear attitude and gyroscope's bias estimation for a VTOL UAV  

Microsoft Academic Search

This paper addresses the problem of attitude and heading restitution for a VTOL UAV. We describe an observation strategy to restitute the complete attitude matrix of the vehicle starting from Inertial Measurement Unit (IMU) and magnetometers. This study is a part of the development of the ducted fan UAV designed by Bertin Technologies. First, a measured orientation matrix is calculated

Jean Michel Pflimlin; Tarek Hamel; Philippe Souères

2007-01-01

19

Avionics system design of a mini VTOL UAV  

Microsoft Academic Search

In this paper, the avionics system design of a mini vertical take-off and landing (VTOL) capable Unmanned Aerial Vehicle (UAV) namely a Quadrotor will be described. The Turkish Air Force Academy personnel together with a team of cadets have been working on the design and development of an autonomous quadrotor vehicle for educational purposes. The main emphasize was to study

Mustafa Ilarslan; M. Kemal Bayrakceken; Aydemir Arisoy

2010-01-01

20

Avionics system design of a mini VTOL UAV  

Microsoft Academic Search

Herein, the avionics system design of a mini Vertical Take-Off And Landing (VTOL) capable Unmanned Aerial Vehicle (UA V), namely a Quadrotor, will be described. The Turkish Air Force Academy personnel together with a team of cadets have been working on the design and development of an autonomous Quadrotor vehicle for educational purposes. The main emphasis was to study the

Mustafa Ilarslan; M. Kemal Bayrakceken; Aydemir Arisoy

2011-01-01

21

Attitude and gyro bias estimation for a VTOL UAV  

Microsoft Academic Search

In this paper, a nonlinear complementary filter (x-estimator) is presented to estimate the attitude of a vertical take off and landing unmanned aerial vehicle (VTOL UAV). The measurements are taken from a low-cost IMU (inertial measurement unit) which consists of 3-axis accelerometers and 3-axis gyroscopes. The gyro bias are estimated online. A second nonlinear complementary filter (z-estimator) which combines 3-axis

Najib Metni; Jean-Michel Pflimlin; Tarek Hamel; Philippe Souères

2006-01-01

22

Investigation of Crew Escape Concepts for VTOL and Low-Altitude DASH Vehicles.  

National Technical Information Service (NTIS)

This report covers the results of a study to define crew escape requirements and criteria for selection, evaluation, and design of crew escape systems for VTOL and low-altitude dash vehicles. Escape concept performance, survival, pressurization, restraint...

J. O. Bull E. L. Serocki J. Schor L. J. Nolan B. C. Mackey

1967-01-01

23

Design and development of an unconventional VTOL micro air vehicle: The Cyclocopter  

NASA Astrophysics Data System (ADS)

This paper discusses the systematic experimental and vehicle design/development studies conducted at the University of Maryland which culminated in the development of the first flying Cyclocopter in the history. Cyclocopter is a novel Vertical Take-Off and Landing (VTOL) aircraft, which utilizes cycloidalrotors (cyclorotors), a revolutionary horizontal axis propulsion concept, that has many advantages such as higher aerodynamic efficiency, maneuverability and high-speed forward flight capability when compared to a conventional helicopter rotor. The experimental studies included a detailed parametric study to understand the effect of rotor geometry and blade kinematics on cyclorotor hover performance. Based on the experimental results, higher blade pitch angles were found to improve thrust and increase the power loading (thrust per unit power) of the cyclorotor. Asymmetric pitching with higher pitch angle at the top than at the bottom produced better power loading. The chordwise optimum pitching axis location was observed to be around 25-35% of the blade chord. Because of the flow curvature effects, the cycloidal rotor performance was a strong function of the chord/radius ratio. The optimum chord/radius ratios were extremely high, around 0.5-0.8, depending on the blade pitching amplitude. A flow field investigation was also conducted using Particle Image Velocimetry (PIV) to unravel the physics behind thrust production of a cyclorotor. PIV studies indicated evidence of a stall delay as well as possible increases in lift on the blades from the presence of a leading edge vortex. The goal of all these studies was to understand and optimize the performance of a micro-scale cyclorotor so that it could be used in a flying vehicle. An optimized cyclorotor was used to develop a 200 gram cyclocopter capable of autonomous stable hover using an onboard feedback controller.

Benedict, Moble; Chopra, Inderjit

2012-05-01

24

Thrust Control Mechanism of VTOL UAV Cyclocopter with Cycloidal Blades System  

Microsoft Academic Search

This study describes the control mechanism of a VTOL UAV cyclocopter. The cycloidal blades system (CBS), which is a thrust system of cyclocopter is composed of several blades rotating about a horizontal axis. To generate the required thrust, the pitch angles of the blades are periodically oscillated by a pitch control mechanism. And it can change both the magnitude and

Chul Yong Yun; Ill Kyung Park; In Seong Hwang; Seung Jo Kim

2005-01-01

25

The development of a UGV-mounted automated refueling system for VTOL UAVs  

NASA Astrophysics Data System (ADS)

This paper describes the latest efforts to develop an Automated UAV Mission System (AUMS) for small vertical takeoff and landing (VTOL) unmanned air vehicles (UAVs). In certain applications such as force protection, perimeter security, and urban surveillance a VTOL UAV can provide far greater utility than fixed-wing UAVs or ground-based sensors. The VTOL UAV can operate much closer to an object of interest and can provide a hover-and-stare capability to keep its sensors trained on an object, while the fixed wing UAV would be forced into a higher altitude loitering pattern where its sensors would be subject to intermittent blockage by obstacles and terrain. The most significant disadvantage of a VTOL UAV when compared to a fixed-wing UAV is its reduced flight endurance. AUMS addresses this disadvantage by providing forward staging, refueling, and recovery capabilities for the VTOL UAV through a host unmanned ground vehicle (UGV), which serves as a launch/recovery platform and service station. The UGV has sufficient payload capacity to carry UAV fuel for multiple launch, recovery, and refuel iterations. The UGV also provides a highly mobile means of forward deploying a small UAV into hazardous areas unsafe for personnel, such as chemically or biologically contaminated areas. Teaming small UAVs with large UGVs can decrease risk to personnel and expand mission capabilities and effectiveness. There are numerous technical challenges being addressed by these development efforts. Among the challenges is the development and integration of a precision landing system compact and light enough to allow it to be mounted on a small VTOL UAV while providing repeatable landing accuracy to safely land on the AUMS. Another challenge is the design of a UGV-transportable, expandable, self-centering landing pad that contains hardware and safety devices for automatically refueling the UAV. A third challenge is making the design flexible enough to accommodate different types of VTOL UAVs, such as the AAI iSTAR ducted-fan vehicle and small helicopter UAVs. Finally, a common command-and-control architecture which supports the UAV, UGV, and AUMS must be developed and interfaced with these systems to allow fully autonomous collaborative behaviors. Funded by the Joint Robotics Program, AUMS is part of a joint effort with the Air Force Research Laboratory and the Army Missile Research Development and Engineering Command. The objective is to develop and demonstrate UGVUAV teaming concepts and work with the warfighter to ensure that future upgrades are focused on operational requirements. This paper describes the latest achievements in AUMS development and some of the military program and first responder situations that could benefit from this system.

Wills, Mike; Burmeister, Aaron; Nelson, Travis; Denewiler, Thomas; Mullens, Kathy

2006-06-01

26

Accurate Modeling and Robust Hovering Control for a Quad-rotor VTOL Aircraft  

Microsoft Academic Search

\\u000a Quad-robot type (QRT) unmanned aerial vehicles (UAVs) have been developed for quick detection and observation of the circumstances\\u000a under calamity environment such as indoor fire spots. The UAV is equipped with four propellers driven by each electricmotor,\\u000a an embedded controller, an Inertial Navigation System (INS) using three rate gyros and accelerometers, a CCD (Charge Coupled\\u000a Device) camera with wireless communication

Jinhyun Kim; Min-Sung Kang

27

Accurate Modeling and Robust Hovering Control for a Quad-rotor VTOL Aircraft  

Microsoft Academic Search

Quad-robot type (QRT) unmanned aerial vehicles (UAVs) have been developed for quick detection and observation of the circumstances\\u000a under calamity environment such as indoor fire spots. The UAV is equipped with four propellers driven by each electric motor,\\u000a an embedded controller, an Inertial Navigation System (INS) using three rate gyros and accelerometers, a CCD (Charge Coupled\\u000a Device) camera with wireless

Jinhyun Kim; Min-sung Kang

2010-01-01

28

Using natural features for vision based navigation of an indoor-VTOL MAV  

Microsoft Academic Search

The use of natural features for vision based navigation of an indoor Vertical-Take-Off-and-Landing (VTOL) Micro Aerial Vehicle (MAV) named Air-Quad is presented. Air-Quad is a small four-rotor helicopter developed at the ITE.Such a helicopter needs reliable attitude information. The measurements of the used MEMS gyroscopes and accelerometers are corrupted by strong noise. To be useful, the MEMS sensors have to

Christian Schlaile; Oliver Meister; Natalie Frietsch; Christoph Keßler; Jan Wendel; Gert F. Trommer

2009-01-01

29

Development of a GPS\\/INS\\/MAG navigation system and waypoint navigator for a VTOL UAV  

Microsoft Academic Search

Unmanned aerial vehicles (UAV) can be used for versatile surveillance and reconnaissance missions. If a UAV is capable of flying automatically on a predefined path the range of possible applications is widened significantly. This paper addresses the development of the integrated GPS\\/INS\\/MAG navigation system and a waypoint navigator for a small vertical take-off and landing (VTOL) unmanned four-rotor helicopter with

Oliver Meister; Ralf Mönikes; Jan Wendel; Natalie Frietsch; Christian Schlaile; Gert F. Trommer

2007-01-01

30

Attitude Estimation and Position Control of VTOL UAVs using IMU and GPS Measurements  

Microsoft Academic Search

We address two fundamental problems associated with the control of vertical take-off and landing (VTOL) unmanned airborne vehicles (UAVs): attitude estimation and position control. We propose two velocity-aided attitude observers which utilize a global-positioning system (GPS) in addition to an inertial measurement unit (IMU). The `velocity-aided' class of observer uses an accelerometer to measure the system \\\\emph{apparent acceleration} (instead of

Andrew Roberts; Abdelhamid Tayebi

2011-01-01

31

Versatile, modular, extensible vtol aerial platform with autonomous flight mode transitions  

Microsoft Academic Search

This paper presents the Quadshot, a novel aerial robotic platform with Vertical Take-Off and Landing (VTOL) capability. Highly dynamic maneuverability is achieved via a combination of differential thrust and aerodynamic surfaces (elevons). The relaxed stability, flying wing, tail-sitter configuration, Radio Controlled (RC) airframe is actively stabilized by onboard controllers in three complementary modes of operation, i.e. hover, horizontal flight and

Pranay Sinha; Piotr Esden-Tempski; Christopher A. Forrette; Jeffrey K. Gibboney; Gregory M. Horn

2012-01-01

32

The Advantages, Potentials and Safety of VTOL Suborbital Space Tourism Operations  

NASA Astrophysics Data System (ADS)

Suborbital space tourism offers short-time zero gravity and Earth view from space to its customers, and a package that can offer the longest duration of zero- gravity and the most exciting Earth view from space to its customer can be considered a better one than the others. To increase the duration of zero gravity time involves the design and engineering of the suborbital vehicles, but to improve the view of Earth from space aboard a suborbital vehicle, involves more than just the design and engineering of the vehicle, but more on the location of where the vehicle operates. So far, most of the proposed operations of suborbital space tourism vehicles involve a flight to above 80km and less than 120km and taking-off and landing at the same location. Therefore, the operational location of the suborbital vehicle clearly determines the view of earth from space that will be available to its passengers. The proposed operational locations or spaceports usually are existing airports such as the airport at Curacao Island in the Caribbean or spaceport specially built at locations with economic interests such as Spaceport America in New Mexico or an airport that is going to be built, such as SpaceportSEA in Selangor, Malaysia. Suborbital vehicles operating from these spaceports can only offer limited views of Earth from space which is only few thousand kilometers of land or sea around their spaceports, and a clear view of only few hundred kilometers of land or sea directly below them, even though the views can be enhanced by the application of optical devices. Therefore, the view of some exotic locations such as a colorful coral reef, and phenomena such as a smoking volcano on Earth which may be very exciting when viewed from space will not be available on these suborbital tourism packages. The only possible way for the passengers of a suborbital vehicle to view such exotic locations and phenomena is by flying above or near them, and since it will not be economic and will be more risky for a suborbital vehicle to fly above such objects after taking off from a spaceport far away from the object, and later returning to the spaceport, the way to go is to have the operation of the suborbital vehicle near the exotic locations. Unfortunately, some exotic locations such as a tropical archipelago in the middle of a clear blue ocean or a permanent icecap on a mountain range with variety of vegetation around it due to differences in height may not have suitable runway to function as spaceport, and for such reason, VTOL (vertical take-off and landing) capability for suborbital tourism vehicle may be worth considered. VTOL suborbital space tourism vehicle may not operate from a remote uneconomical location even though the location is near an exotic viewing target, but such vehicle may operate from a luxury super yacht that can sail to exotic locations around the world, and during the journey, the passengers can be trained and prepared for the flight of their life. Such is an advantage and potential of VTOL suborbital space tourism vehicle, but VTOL operation can be more complex than a conventional operation and therefore will increase the risk of operation, and for this reason the safety issue for such operation is very significant. This paper explores and discusses some advantages and potentials of VTOL suborbital space tourism operations and safety issues related to them. It also describes a couple of proposed concepts of VTOL suborbital tourism vehicles and potential exotic locations on Earth to be viewed from such vehicles.

Ridzuan Zakaria, N.; Nasrun, N.; Abu, J.; Jusoh, A.; Azim, L.; Said, A.; Ishak, S.; Rafidi Zakaria, N.

2012-01-01

33

Modeling and simulation of a VTOL UAV for landing gear performance evaluation  

NASA Astrophysics Data System (ADS)

A multibody dynamics model of a Vertical Take-off and Landing (VTOL) Unmanned Aerial Vehicle (UAV) is presented in this study. The scope of the project was to investigate a lightweight landing gear which has a stable and robust landing performance. Two original designs of the landing gear for the module of interest have been modeled and analyzed in this study. Two new designs have also been developed, modeled, and analyzed. A limited analysis of the forces that occur in the legs/struts has also been performed, to account for possible failure of the members due to buckling. The model incorporates a sloped surface of deformable terrain for stability analysis of the landing scenarios, and unilateral constraints to model the ground reaction forces upon contact. The lift forces on the UAV are modeled as mathematical relations dependent on the speed of the ducted fan to enable the variation of the impact velocities and the different landing scenarios. The simulations conducted illustrate that initial conditions at landing have a big impact on the stability of the module. The two new designs account for the worst possible scenario, and, for the material properties given, end with a larger weight than the one of the original design with three legs and a ring. Simulation data from several landing scenarios are presented in this paper, with analysis of the difference in performance among the different designs.

Chan, Brendan J.; Sandu, Corina; Ko, Andy; Streett, Tim

2007-05-01

34

Aircraft Noise  

NASA Astrophysics Data System (ADS)

Aircraft industry is exposed to increasing public pressure aiming at a continuing reduction of aircraft noise levels. This is necessary to both compensate for the detrimental effect on noise of the expected increase in air traffic and improve the quality of living in residential areas around airports.

Michel, Ulf; Dobrzynski, Werner; Splettstoesser, Wolf; Delfs, Jan; Isermann, Ullrich; Obermeier, Frank

35

Aircraft Icing  

Microsoft Academic Search

Full-scale icing experiments and, therefore, certification time and cost can be significantly reduced by developing calculation methods to evaluate the aircraft and system performance for a wide range of icing conditions. This article summarizes calculation methods for icing that include ice accretion, ice system performance, and icing effects on aircraft.

Tuncer Cebeci; Fassi Kafyeke

2003-01-01

36

Development of a GPS/INS/MAG navigation system and waypoint navigator for a VTOL UAV  

NASA Astrophysics Data System (ADS)

Unmanned aerial vehicles (UAV) can be used for versatile surveillance and reconnaissance missions. If a UAV is capable of flying automatically on a predefined path the range of possible applications is widened significantly. This paper addresses the development of the integrated GPS/INS/MAG navigation system and a waypoint navigator for a small vertical take-off and landing (VTOL) unmanned four-rotor helicopter with a take-off weight below 1 kg. The core of the navigation system consists of low cost inertial sensors which are continuously aided with GPS, magnetometer compass, and a barometric height information. Due to the fact, that the yaw angle becomes unobservable during hovering flight, the integration with a magnetic compass is mandatory. This integration must be robust with respect to errors caused by the terrestrial magnetic field deviation and interferences from surrounding electronic devices as well as ferrite metals. The described integration concept with a Kalman filter overcomes the problem that erroneous magnetic measurements yield to an attitude error in the roll and pitch axis. The algorithm provides long-term stable navigation information even during GPS outages which is mandatory for the flight control of the UAV. In the second part of the paper the guidance algorithms are discussed in detail. These algorithms allow the UAV to operate in a semi-autonomous mode position hold as well an complete autonomous waypoint mode. In the position hold mode the helicopter maintains its position regardless of wind disturbances which ease the pilot job during hold-and-stare missions. The autonomous waypoint navigator enable the flight outside the range of vision and beyond the range of the radio link. Flight test results of the implemented modes of operation are shown.

Meister, Oliver; Mönikes, Ralf; Wendel, Jan; Frietsch, Natalie; Schlaile, Christian; Trommer, Gert F.

2007-05-01

37

Conceptual Design Study of 1985 Commercial VTOL Transports That Utilize Rotors.  

National Technical Information Service (NTIS)

Conceptual design studies of pure and compound helicopter commercial short-haul transport aircraft for initial fabrication in 1980 were performed to determine their technical and economic feasibility. One-hundred-passenger configurations were optimized fo...

N. F. K. Kefford C. L. Munch

1975-01-01

38

Aircraft Industry.  

National Technical Information Service (NTIS)

The aircraft industry plays a critical role in today's global economy. Comprising a wide array of firms supplying various products and services to a diverse and dynamic customer base, this industry represents a compelling case study from three distinct pe...

B. Braley D. Bereda F. M. Al Garni J. Bojarski J. Spicer

2007-01-01

39

Aircraft disinsection.  

PubMed

Aircraft disinsection has been an international practice since the 1920s, the purpose of which is to protect public health, the environment, agriculture, and livestock by the eradication of disease vectors. Although most nations of the world have discontinued this practice, about 20 continue with this requirement. Aircraft disinsection is sanctioned by international law with the World Health Organization (WHO) publishing general procedural guidelines in the International Health Regulations (IHR). There are currently four acceptable procedures: blocks away, top of descent, on arrival, and residual. A 2% pyrethrum solution, a naturally occurring substance found in the chrysanthemum flower, or several synthetic pyrethroids, are the recommended agents because they are extremely effective insecticides which pose minimal health risks. Although the use of insecticides for aircraft disinsection is controversial, national policies compelling this requirement must be respected. This paper will explore the background of aircraft disinsection, the procedures, the types of agents, and the toxicity. If aircraft disinsection is regulatory policy, it should be done in accordance with WHO procedures. Residual application is probably the most efficacious method. The use of air curtains or plastic strips should be explored as an alternative to the use of chemicals. PMID:16856359

Rayman, Russell B

2006-07-01

40

Aircraft Electrical Generators.  

National Technical Information Service (NTIS)

Contents: General Information on Aircraft Electrical Machines General Information on Aircraft Generators Alternating-Current Aircraft Generators Permanent-Magnet Generators Induction Generators Direct-Current Aircraft Generators Parallel Operation of Airc...

A. I. Bertinov

1964-01-01

41

Conceptual Design Study of 1985 Commercial Tilt Rotor Transports. Volume 1: Vtol Design Summary.  

National Technical Information Service (NTIS)

Aircraft were synthesized in the 21-, 45-, and 100- passenger categories. Technological factors were considered and the 45-passenger point design, designated the D312, was selected. Variants of the D312 having sideline noise levels in hover of + or - 5 PN...

J. A. Detore K. W. Sambell

1975-01-01

42

Aircraft icing  

Microsoft Academic Search

This paper reviews the background to and the current status of analyses developed to address the problem of icing on aircraft. Methods for water droplet trajectory calculation, ice accretion prediction, aerodynamic performance degradation and an overview of ice protection system modelling are presented. The paper addresses the issues involved in the development of icing analyses including problem formulation and assumptions,

R. W. Gent; N. P. Dart; J. T. Cansdale

2000-01-01

43

A Control Approach for Thrust-Propelled Underactuated Vehicles and its Application to VTOL Drones  

Microsoft Academic Search

A control approach is proposed for a class of underactuated vehicles in order to stabilize reference trajectories either in thrust direction, velocity, or position. The basic modeling assumption is that the vehicle is pro-pulsed via a thrust force along a single body-fixed direction and that it has full torque actuation for attitude control (i.e., a typical actuation structure for aircrafts,

Minh-Duc Hua; Tarek Hamel; Pascal Morin; Claude Samson

2009-01-01

44

Educating with Aircraft Models  

ERIC Educational Resources Information Center

|Described is utilization of aircraft models, model aircraft clubs, and model aircraft magazines to promote student interest in aerospace education. The addresses for clubs and magazines are included. (SL)|

Steele, Hobie

1976-01-01

45

Forecasting Aircraft Condensation Trails.  

National Technical Information Service (NTIS)

Aircraft condensation trails (contrails) are caused by aircraft aerodynamics or engine exhaust in the proper atmospheric conditions. Engine-exhaust trails are the most common and are discussed in this report. Jet aircraft contrail-formation graphs facilit...

1981-01-01

46

Atomic Aircraft Engines.  

National Technical Information Service (NTIS)

The advantages and disadvantages found in nuclear aircraft engines are discussed. The advantages of atomic aircraft engines over conventional are multifold. Some are of extreme importance to further growth in aircraft developments. Nuclear power plants of...

N. Vasiljevic

1966-01-01

47

Rescue Equipment, Aircraft Crash.  

National Technical Information Service (NTIS)

Procedures are identified for evaluation of aircraft borne aircraft crash rescue equipment under simulated tactical conditions. Helicopter mounted rescue hoists and accessories are also included. (Author)

1971-01-01

48

World commercial aircraft accidents  

SciTech Connect

This report is a compilation of all accidents world-wide involving aircraft in commercial service which resulted in the loss of the airframe or one or more fatality, or both. This information has been gathered in order to present a complete inventory of commercial aircraft accidents. Events involving military action, sabotage, terrorist bombings, hijackings, suicides, and industrial ground accidents are included within this list. Included are: accidents involving world commercial jet aircraft, world commercial turboprop aircraft, world commercial pistonprop aircraft with four or more engines and world commercial pistonprop aircraft with two or three engines from 1946 to 1992. Each accident is presented with information in the following categories: date of the accident, airline and its flight numbers, type of flight, type of aircraft, aircraft registration number, construction number/manufacturers serial number, aircraft damage, accident flight phase, accident location, number of fatalities, number of occupants, cause, remarks, or description (brief) of the accident, and finally references used. The sixth chapter presents a summary of the world commercial aircraft accidents by major aircraft class (e.g. jet, turboprop, and pistonprop) and by flight phase. The seventh chapter presents several special studies including a list of world commercial aircraft accidents for all aircraft types with 100 or more fatalities in order of decreasing number of fatalities, a list of collision accidents involving commercial aircrafts, and a list of world commercial aircraft accidents for all aircraft types involving military action, sabotage, terrorist bombings, and hijackings.

Kimura, C.Y.

1993-01-01

49

More Electric Aircraft  

Microsoft Academic Search

The More Electric Aircraft (MEA) concept is based on utilizing electric power to drive aircraft subsystems. With advancing electric power technology it will be feasible to use high power density electrical power components to drive the majority of aircraft subsystems. Each of the power transfer disciplines on an aircraft requires specialized Aerospace Ground Equipment\\/Ground Support Equipment (AGE\\/GSE), personnel, and deployment

R. E. J. Quigley

1993-01-01

50

International Pacific Air and Space Technology Conference and Aircraft Symposium, 29th, Gifu, Japan, Oct. 7-11, 1991, Proceedings  

SciTech Connect

Various papers on air and space technology are presented. Individual topics addressed include: media selection analysis: implications for training design, high-speed challenge for rotary wing aircraft, high-speed VSTOL answer to congestion, next generation in computational aerodynamics, acrobatic airship 'Acrostat', ducted fan VTOL for working platform, Arianespace launch of Lightsats, small particle acceleration by minirailgun, free-wake analyses of a hovering rotor using panel method, update of the X-29 high-angle-of-attack program, economic approach to accurate wing design, flow field around thick delta wing with rounded leading edge, aerostructural integrated design of forward-swept wing, static characteristics of a two-phase fluid drop system, simplfied-model approach to group combustion of fuel spray, avionics flight systems for the 21st century. Also discussed are: Aircraft Command in Emergency Situations, spectrogram diagnosis of aircraft disasters, shock interaction induced by two hemisphere-cylinders, impact response of composite UHB propeller blades, high-altitude lighter-than-air powered platform, integrated wiring system, auxiliary power units for current and future aircraft, Space Shuttle Orbiter Auxiliary Power Unit status, numerical analysis of RCS jet in hypersonic flights, energy requirements for the space frontier, electrical system options for space exploration, aerospace plane hydrogen scramjet boosting, manual control of vehicles with time-varying dynamics, design of strongly stabilizing controller, development of the Liquid Apogee Propulsion System for ETS-VI.

Not Available

1991-01-01

51

Aircraft Depainting Technology.  

National Technical Information Service (NTIS)

Chemical paint strippers historically used for aircraft contained toxic and hazardous components; aircraft depainting operations are a major source of hazardous waste generation in DOD. Federal and state agencies have begun to restrict using these hazardo...

J. Kozol D. Conrad S. Hartle G. Neumeister S. Spadafora

1999-01-01

52

Hypersonic Reconnaissance Aircraft.  

National Technical Information Service (NTIS)

A conceptual design of a hypersonic reconnaissance aircraft for the U.S. Navy is discussed. After eighteen weeks of work, a waverider design powered by two augmented turbofans was chosen. The aircraft was designed to be based on an aircraft carrier and to...

T. Bulk D. Chiarini K. Hill B. Kunszt C. Odgen

1992-01-01

53

Unmanned aircraft systems  

Technology Transfer Automated Retrieval System (TEKTRAN)

Unmanned platforms have become increasingly more common in recent years for acquiring remotely sensed data. These aircraft are referred to as Unmanned Airborne Vehicles (UAV), Remotely Piloted Aircraft (RPA), Remotely Piloted Vehicles (RPV), or Unmanned Aircraft Systems (UAS), the official term used...

54

AIRCRAFT OPERATIONS CLASSIFICATION SYSTEM  

Microsoft Academic Search

Accurate data is important in the aviation planning process. In this project we consider systems for measuring aircraft activity at airports. This would include determining the type of aircraft such as jet, helicopter, single engine, and multiengine propeller. Some of the issues involved in deploying technologies for monitoring aircraft operations are cost, reliability, and accuracy. In addition, the system must

Charles Harlow; Weihong Zhu

2001-01-01

55

14 CFR 21.6 - Manufacture of new aircraft, aircraft engines, and propellers.  

Code of Federal Regulations, 2013 CFR

...new aircraft, aircraft engines, and propellers. 21.6 Section 21.6 Aeronautics...new aircraft, aircraft engines, and propellers. (a) Except as specified in...a new aircraft, aircraft engine, or propeller based on a type certificate unless...

2013-01-01

56

14 CFR 43.7 - Persons authorized to approve aircraft, airframes, aircraft engines, propellers, appliances, or...  

Code of Federal Regulations, 2013 CFR

...aircraft, airframes, aircraft engines, propellers, appliances, or component parts for...aircraft, airframes, aircraft engines, propellers, appliances, or component parts for...aircraft, airframe, aircraft engine, propeller, appliance, or component part...

2013-01-01

57

Civil aircraft accident investigation.  

PubMed

This talk reviews some historic aircraft accidents and some more recent. It reflects on the division of accident causes, considering mechanical failures and aircrew failures, and on aircrew training. Investigation results may lead to improved aircraft design, and to appropriate crew training. PMID:24057309

Haines, Daniel

2013-01-01

58

Adapter for Towing Aircraft.  

National Technical Information Service (NTIS)

Disclosed is an adapter for existing tow bars or spotting dollies to two aircraft having non-conventional landing gear. The adapter has a vertical member which is dimensioned to fit into a socket mounted in the bottom of the aircraft in the vicinity of th...

H. H. Perry

1983-01-01

59

Aircraft EMP Isolation Study.  

National Technical Information Service (NTIS)

This report presents the results of a preliminary study into methods for electrically isolating the E-4B, the EC-135, and the EC-130 aircraft during EMP tests where the aircraft under test is directly driven by a high-voltage pulser.

A. Finci H. Price P. Chao S. Mercer T. Naff

1980-01-01

60

Aging Aircraft Structures Database.  

National Technical Information Service (NTIS)

This report summarizes the work performed by the Boeing Company to develop an aging aircraft structures database to be used to aid in the verification of structural integrity analysis of aircraft structures. Sample data were collected for the C-30 EC-135,...

R. Perez

1998-01-01

61

Aircraft EMP isolation study  

Microsoft Academic Search

This report presents the results of a preliminary study into methods for electrically isolating the E-4B, the EC-135, and the EC-130 aircraft during EMP tests where the aircraft under test is directly driven by a high-voltage pulser.

A. Finci; H. Price; P. Chao; S. Mercer; T. Naff

1980-01-01

62

Hypersonic Aircraft Design.  

National Technical Information Service (NTIS)

A hypersonic aircraft is designed which uses scramjets to accelerate from Mach 6 to Mach 10 and sustain that speed for two minutes. Different propulsion systems were considered and it was decided that the aircraft would use one full scale turbofan-ramjet....

H. Alkamhawi T. Greiner G. Fuerst S. Luich B. Stonebraker

1990-01-01

63

Manual Switches for Aircraft  

Microsoft Academic Search

In the design and application of electrical control equipment the problem of obtaining complete field data and requirements is always present in some degree. The problem is acute in branches of the electrical industry supplying aircraft control. Three factors contribute to the difficulty: 1. The tremendous engineering effort centered in the aircraft industry causes rapid technical changes that soon make

R. A. Millermaster

1943-01-01

64

Predicting Visibility of Aircraft  

PubMed Central

Visual detection of aircraft by human observers is an important element of aviation safety. To assess and ensure safety, it would be useful to be able to be able to predict the visibility, to a human observer, of an aircraft of specified size, shape, distance, and coloration. Examples include assuring safe separation among aircraft and between aircraft and unmanned vehicles, design of airport control towers, and efforts to enhance or suppress the visibility of military and rescue vehicles. We have recently developed a simple metric of pattern visibility, the Spatial Standard Observer (SSO). In this report we examine whether the SSO can predict visibility of simulated aircraft images. We constructed a set of aircraft images from three-dimensional computer graphic models, and measured the luminance contrast threshold for each image from three human observers. The data were well predicted by the SSO. Finally, we show how to use the SSO to predict visibility range for aircraft of arbitrary size, shape, distance, and coloration.

Watson, Andrew; Ramirez, Cesar V.; Salud, Ellen

2009-01-01

65

Tropospheric sampling with aircraft  

SciTech Connect

Aircraft constitute a unique environment which places stringent requirements on the instruments used to measure the concentrations of atmospheric trace gases and aerosols. Some of these requirements such as minimization of size, weight, and power consumption are general; others are specific to individual techniques. This review presents the basic principles and considerations governing the deployment of trace gas and aerosol instrumentation on an aircraft. An overview of common instruments illustrates these points and provides guidelines for designing and using instruments on aircraft-based measurement programs.

Daum, P.H.; Springston, S.R.

1991-03-01

66

Army Aircraft Armament.  

National Technical Information Service (NTIS)

The background document provides general testing information relative to the planning and conduct of army aircraft armament engineering evaluation. This information supplements and is applied in common to test procedures which deal with the evaluation of ...

1970-01-01

67

Tractor, Wheeled, Aircraft, Towing.  

National Technical Information Service (NTIS)

The Army service test procedure describes test methods and techniques for evaluating the performance and characteristics of aircraft towing tractors (wheeled type), and for determining their suitability for service use by the U.S. Army. (Author)

1970-01-01

68

Tractor Wheeled, Aircraft, Towing.  

National Technical Information Service (NTIS)

This Engineering Test Procedure describes test methods and techniques for evaluating the technical performance and characteristics of Aircraft Towing Tractors (Wheeled Type) and for determining the suitability of the test item to be subjected to service t...

1969-01-01

69

Aircraft Cable Parameter Study.  

National Technical Information Service (NTIS)

This report describes experimental and analytical results obtained from a study of the transmission line properties of multiconductor cables commonly found on aircraft. A method for the complete characterization of multiconductor transmission lines in inh...

H. M. Fowles L. D. Scott A. K. Agrawal K. M. Lee

1977-01-01

70

Solar thermal aircraft  

DOEpatents

A solar thermal powered aircraft powered by heat energy from the sun. A heat engine, such as a Stirling engine, is carried by the aircraft body for producing power for a propulsion mechanism, such as a propeller. The heat engine has a thermal battery in thermal contact with it so that heat is supplied from the thermal battery. A solar concentrator, such as reflective parabolic trough, is movably connected to an optically transparent section of the aircraft body for receiving and concentrating solar energy from within the aircraft. Concentrated solar energy is collected by a heat collection and transport conduit, and heat transported to the thermal battery. A solar tracker includes a heliostat for determining optimal alignment with the sun, and a drive motor actuating the solar concentrator into optimal alignment with the sun based on a determination by the heliostat.

Bennett, Charles L. (Livermore, CA)

2007-09-18

71

Alternative Aircraft Fuels.  

National Technical Information Service (NTIS)

The efficient utulization of fossil fuels by future jet aircraft may necessitate the broadening of current aviation turbine fuel specifications. The most significant changes in specifications would be an increased aromatics content and a higher final boil...

J. P. Longwell J. Grobman

1977-01-01

72

Aircraft Configuration Study for Experimental 2-Place Aircraft and RPVs.  

National Technical Information Service (NTIS)

A performance comparison and tradeoff study was conducted between eight unique aircraft configurations for high performance light aircraft and remotely piloted vehicles. These configurations included conventional tractor, conventional pusher, canard, tand...

G. D. Black

1990-01-01

73

IDENTIFICATION OF AIRCRAFT HAZARDS  

SciTech Connect

Aircraft hazards were determined to be potentially applicable to a repository at Yucca Mountain in the ''Monitored Geological Repository External Events Hazards Screening Analysis'' (BSC 2004, Section 6.4.1). That determination was conservatively based on limited knowledge of flight data in the area of concern and on crash data for aircraft of the type flying near Yucca Mountain. The purpose of this report is to identify specific aircraft hazards that may be applicable to a Monitored Geologic Repository (MGR) at Yucca Mountain using NUREG-0800, ''Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants'' (NRC 1987, Section 3.5.1.6), as guidance for the inclusion or exclusion of identified aircraft hazards. NUREG-0800 is being used here as a reference because some of the same considerations apply. The intended use of this report is to provide inputs for further screening and analysis of the identified aircraft hazards based on the criteria that apply to Category 1 and 2 event sequence analyses as defined in 10 CFR 63.2 (see Section 4). The scope of this technical report includes the evaluation of military, private, and commercial use of airspace in the 100-mile regional setting of the MGR at Yucca Mountain with the potential for reducing the regional setting to a more manageable size after consideration of applicable screening criteria (see Section 7).

K.L. Ashley

2005-03-23

74

Identification of Aircraft Hazards  

SciTech Connect

Aircraft hazards were determined to be potentially applicable to a repository at Yucca Mountain in ''Monitored Geological Repository External Events Hazards Screening Analysis'' (BSC 2005 [DIRS 174235], Section 6.4.1). That determination was conservatively based upon limited knowledge of flight data in the area of concern and upon crash data for aircraft of the type flying near Yucca Mountain. The purpose of this report is to identify specific aircraft hazards that may be applicable to a monitored geologic repository (MGR) at Yucca Mountain, using NUREG-0800, ''Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants'' (NRC 1987 [DIRS 103124], Section 3.5.1.6), as guidance for the inclusion or exclusion of identified aircraft hazards. The intended use of this report is to provide inputs for further screening and analysis of identified aircraft hazards based upon the criteria that apply to Category 1 and Category 2 event sequence analyses as defined in 10 CFR 63.2 [DIRS 176544] (Section 4). The scope of this report includes the evaluation of military, private, and commercial use of airspace in the 100-mile regional setting of the repository at Yucca Mountain with the potential for reducing the regional setting to a more manageable size after consideration of applicable screening criteria (Section 7).

K. Ashley

2006-12-08

75

Aircraft noise synthesis system  

NASA Astrophysics Data System (ADS)

A second-generation Aircraft Noise Synthesis System has been developed to provide test stimuli for studies of community annoyance to aircraft flyover noise. The computer-based system generates realistic, time-varying, audio simulations of aircraft flyover noise at a specified observer location on the ground. The synthesis takes into account the time-varying aircraft position relative to the observer; specified reference spectra consisting of broadband, narrowband, and pure-tone components; directivity patterns; Doppler shift; atmospheric effects; and ground effects. These parameters can be specified and controlled in such a way as to generate stimuli in which certain noise characteristics, such as duration or tonal content, are independently varied, while the remaining characteristics, such as broadband content, are held constant. The system can also generate simulations of the predicted noise characteristics of future aircraft. A description of the synthesis system and a discussion of the algorithms and methods used to generate the simulations are provided. An appendix describing the input data and providing user instructions is also included.

McCurdy, David A.; Grandle, Robert E.

1987-02-01

76

Target-Carrier Aircraft Protective System.  

National Technical Information Service (NTIS)

The safety system prevents the target-carrier aircraft from being fired upon by the attacking aircraft during aerial target practice. The attacking aircraft receives an arming signal from the target-carrier aircraft and this signal is interrupted whenever...

F. H. Prestwood

1965-01-01

77

Measuring Aircraft Carrier Flexure in Support of Autonomous Aircraft Landings  

Microsoft Academic Search

This paper quantifies the experimental measurements of aircraft carrier flexure (deformation) at sea in support of the United States Department of Defense sea-based Joint Precision Approach and Landing System (JPALS) that aims to deliver automatic landing capabilities to inbound aircraft aboard aircraft carriers. The methodology for measuring ship flexure using the Global Positioning System (GPS) and inertial sensors is described.

Mark. G. Petovello; Kyle O'Keefe; M. Elizabeth Cannon

2009-01-01

78

Optical Communications for Transport Aircraft.  

National Technical Information Service (NTIS)

Optical communications for transport aircraft are discussed. The problem involves: increasing demand for radio-frequency bands from an enlarging pool of users (aircraft, ground and sea vehicles, fleet operators, traffic control centers, and commercial rad...

R. Stengel

1994-01-01

79

Optical communications for transport aircraft  

NASA Astrophysics Data System (ADS)

Optical communications for transport aircraft are discussed. The problem involves: increasing demand for radio-frequency bands from an enlarging pool of users (aircraft, ground and sea vehicles, fleet operators, traffic control centers, and commercial radio and television); desirability of providing high-bandwidth dedicated communications to and from every aircraft in the National Airspace System; need to support communications, navigation, and surveillance for a growing number of aircraft; and improved meteorological observations by use of probe aircraft. The solution involves: optical signal transmission support very high data rates; optical transmission of signals between aircraft, orbiting satellites, and ground stations, where unobstructed line-of-sight is available; conventional radio transmissions of signals between aircraft and ground stations, where optical line-of-sight is unavailable; and radio priority given to aircraft in weather.

Stengel, Robert

1994-02-01

80

Solar powered aircraft  

SciTech Connect

A cruciform wing structure for a solar powered aircraft is disclosed. Solar cells are mounted on horizontal wing surfaces. Wing surfaces with spanwise axis perpendicular to surfaces maintain these surfaces normal to the sun's rays by allowing aircraft to be flown in a controlled pattern at a large bank angle. The solar airplane may be of conventional design with respect to fuselage, propeller and tail, or may be constructed around a core and driven by propeller mechanisms attached near the tips of the airfoils.

Phillips, W.H.

1983-11-15

81

Survival analysis of aging aircraft  

Microsoft Academic Search

This study pushes systems engineering of aging aircraft beyond the boundaries of empirical and deterministic modeling by making a sharp break with the traditional laboratory-derived corrosion prediction algorithms that have shrouded real-world failures of aircraft structure. At the heart of this problem is the aeronautical industry's inability to be forthcoming in an accurate model that predicts corrosion failures in aircraft

Samuel Benavides

2010-01-01

82

Cooperation in Aircraft Design  

Microsoft Academic Search

We describe how aircraft are designed in a large organization. We discuss the interactions among the different specialist departments during the design process, and the models used by each department. We observe that the main design choices are refinement operations on the design. The overall structure of the organized design process is one of coordinated refinement of models. We describe

Alan H. Bond; Richard J. Ricci

1989-01-01

83

Scaling in model aircraft  

Microsoft Academic Search

The aerodynamic principles of flight are described from the point of view of the way they scale from the largest full-size aircraft to the smallest flying models. Particular attention is paid to the difficulties encountered by small, slow flying machines.

Chris Waltham

1997-01-01

84

Aircraft turbofan noise  

Microsoft Academic Search

Turbofan noise generation and suppression in aircraft engines are reviewed. The chain of physical processes which connect unsteady flow interactions with fan blades to far field noise is addressed. Mechanism identification and description, duct propagation, radiation and acoustic suppression are discussed. The experimental technique of fan inflow static tests are discussed. Rotor blade surface pressure and wake velocity measurements aid

J. F. Groeneweg; E. J. Rice

1983-01-01

85

Nocturnal aircraft noise effects.  

PubMed

Noise protection associated with the construction and extension of airports in the Federal Republic of Germany has been regulated by the law for protection against aircraft noise since 1971. This legislation is due for revision because of different aspects. One aspect is the growth of air traffic which has led many airports to the limits of their capacity and in search of new ways of adaptation to the increasing demand for flight services. Another aspect is the increasing concern of the population about noise effects which has to be addressed by better protection against the effects of aircraft noise. The framework conditions of policy in terms of society as a whole, its health and economic environment need to be put into effect by political action. Science can contribute to this goal by performing noise effects research and by providing recommendations to the political body. However, it remains controversial, what measures are necessary or adequate to assure effective protection of the population against aircraft noise. This is particularly true for the protection of rest and sleep at night. The problem of finding a common basis for adequate recommendations is associated with (1) the low number of primary studies, which also exhibited highly variable results and assessments, (2) the handling of acoustic or psycho-acoustic dimensions for quantifying psychological or physiological reactions, and (3) the conception of how far preventive measures have to go to prove effective. With this in mind, the DLR Institute for Aerospace Medicine is conducting a large-scale, multi-stage study for investigating the acute effects of nocturnal aircraft noise on human sleep. This enterprise is implemented in the framework of the HGF/DLR project "Quiet Air Traffic" for developing sustainable assessment criteria for human-specific effects of aircraft noise at night. PMID:15070533

Basner, M; Samel, A

86

Project report: Aircraft  

SciTech Connect

Analyses of scenarios of past and possible future emissions are an important aspect of assessing the potential environmental effects from aircraft, including the proposed high speed civil transport (HSCT). The development of a detailed three-dimensional database that accurately represents the integration of all aircraft emissions along realistic flight paths for such scenarios requires complex computational modeling capabilities. Such a detailed data set is required for the scenarios evaluated in this interim assessment. Within the NASA High-Speed Research Program, the Emissions Scenarios Committee provides a forum for identifying the required scenarios and evaluating the resulting database being developed with the advanced emissions modeling capabilities at the Boeing Company and McDonnell Douglas Corporation.

Wuebbles, D.J. [Lawrence Livermore National Lab., CA (United States); Baughcum, S. [Boeing Co., Seattle, WA (United States). Commercial Airplane Group; Metwally, M. [McDonnell Douglas Corp., Long Beach, CA (United States); Seals, R. [National Aeronautics and Space Administration, Hampton, VA (United States). Atmospheric Science Div.

1994-04-01

87

Influencing Aircraft Wing Vortices  

Microsoft Academic Search

\\u000a Results presented here were obtained within a project which was part of the Collaborative Research Centre SFB 401 “Flow Modulation\\u000a and Fluid-Structure Interaction at Airplane Wings” funding from the Deutsche Forschungsgemeinschaft (DFG). The goal of this\\u000a project was to gain better understanding of aircraft wake vortices in order to investigate possibilities to mitigate the hazard\\u000a posed by these to following

R. Hörnschemeyer; G. Neuwerth; R. Henke

88

Active Aeroelastic Aircraft Structures  

Microsoft Academic Search

Aeroelasticity results in problems such as structural divergence, aileron reversal, and flutter stability due to insufficient\\u000a torsional stiffness of the wings and “aeroelastic weight penalty” became a widely used expression by engineers in aircraft\\u000a design. Aeroelastic solutions generally involve increasing the structure stiffness or mass balance (passive solutions), which\\u000a typically involve increase of weight and cost while decreasing performance. In

A. Suleman; P. A. Moniz

89

32 CFR 855.6 - Aircraft exempt from the requirement for a civil aircraft landing permit.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Aircraft exempt from the requirement for a civil aircraft landing permit. 855.6 Section 855...Continued) DEPARTMENT OF THE AIR FORCE AIRCRAFT CIVIL AIRCRAFT USE OF UNITED STATES...

2013-07-01

90

Shock suppression supersonic aircraft  

US Patent & Trademark Office Database

The invention is a supersonic aircraft. In detail, the aircraft is in the form of a flying wing having a generally flat upper surface, a generally cosine shaped lower surface and a swept back leading edge. A propulsion system is mounted in the aircraft for providing forward thrust and is adapted to provide a source of pressurized air. A plenum is mounted under and behind the leading edge of the flying wing in a spaced relationship thereto, the plenum having a swept back leading edge and a length substantially equal to the length of the flying wing and a trailing edge in the form of an exhaust nozzle; the exhaust nozzle extending substantially over the entire length of the plenum. A duct system is coupled between the at least one engine and the plenum such that pressurized air from the engine can be provided to the plenum for ejection out the nozzle in the form of a sheet of pressurized air under the wing.

1999-08-10

91

Infrared radiation powered lightweight aircraft  

SciTech Connect

This patent describes a high altitude, ultralight aircraft requiring no fuel. It comprises: an aircraft having wings with broad area lower wing surfaces and a fuselage; a low speed propeller mounted on the aircraft; electric motor means mounted on the aircraft and coupled to drive the propeller; long wavelength infrared (LWIR) responsive cell means for receiving infrared energy radiated from the earth and for supplying electricity to power the motor means. The LWIR cell means being mounted on the lower surfaces of the wings and the fuselage; and the LWIR being substantially the only source of input power for the aircraft to provide a continuous source of power both during the day and at night; whereby the aircraft may have a life at elevated altitudes of several years.

Long, D.E.

1990-03-13

92

14 CFR 252.13 - Small aircraft.  

Code of Federal Regulations, 2013 CFR

...DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS) ECONOMIC REGULATIONS SMOKING ABOARD AIRCRAFT § 252.13 Small aircraft. Air carriers shall prohibit smoking on aircraft designed to have a passenger capacity of 30 or fewer seats....

2013-01-01

93

14 CFR 135.125 - Aircraft security.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Aircraft security. 135.125 ...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Flight Operations § 135.125 Aircraft security....

2013-01-01

94

14 CFR 137.31 - Aircraft requirements.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Aircraft requirements. 137.31...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...OPERATIONS AGRICULTURAL AIRCRAFT OPERATIONS Operating Rules § 137.31 Aircraft requirements. No...

2013-01-01

95

14 CFR 135.25 - Aircraft requirements.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Aircraft requirements. 135.25...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT General § 135.25 Aircraft requirements. (a)...

2013-01-01

96

Ejection Device for Aircraft Crash Dye Marker.  

National Technical Information Service (NTIS)

The buoyant marker is mounted on an aircraft. When activated the marker indicates the point at which an aircraft sank into water. An explosive is used to release a gas which drives the marker buoy from the aircraft.

J. Mellon J. Harding W. J. Zarkowski

1964-01-01

97

14 CFR 21.182 - Aircraft identification.  

Code of Federal Regulations, 2013 CFR

...Certificates § 21.182 Aircraft identification. (a...subpart must show that his aircraft is identified as prescribed...flight permit. (2) An experimental certificate for an aircraft not issued for the...

2013-01-01

98

Inflight characterization of aircraft icing  

Microsoft Academic Search

This thesis advances the development of the Ice Management System (IMS), which has been previously proposed as an additional layer of safety against aircraft icing accidents, by presenting and validating a conceptual design for the icing characterization function of the IMS. This icing characterization function seeks to provide a near real-time estimate of the degradation of the aircraft flight dynamics

James William Melody

2004-01-01

99

Robotic assistants for aircraft inspectors  

Microsoft Academic Search

Aircraft flight pressurization\\/depressurization cycling causes the skin to inflate and deflate, stressing it around the rivets that fasten it to the airframe. The resulting strain, exacerbated by corrosion, drives the growth of initially microscopic cracks. To avoid catastrophe, aircraft are inspected periodically for cracks and corrosion. The inspection technology employed is ?90 percent naked-eye vision. We have developed and demonstrated

Mel Siegel; Priyan Gunatilake; Gregg Podnar

1998-01-01

100

Aircraft wiring program status report  

Microsoft Academic Search

In this Naval Air Warfare Center (NAWC) Aircraft Division status report, the general and wire and cable component activities, the systems engineering activities, the aircraft wiring lead maintenance activities, the NAVAIR\\/NASA interface activities, and the Base Realignment and Closure (BRAC) Commission recommendations are presented.

Rex Beach

1995-01-01

101

Evaluation of Aircraft Brake Materials  

Microsoft Academic Search

A test program was carried out to evaluate several new high-temperature friction materials for use in aircraft disk brakes. A specially built test apparatus utilizing a disk brake and wheel half from a small jet aircraft was used. The apparatus enabled control of brake pressure, velocity and braking time. Tests were run under both constant and variables velocity conditions and

T. L. Ho; F. E. Kennedy; M. B. Peterson

1979-01-01

102

Do supersonic aircraft avoid contrails?  

Microsoft Academic Search

The impact of a potential future fleet of supersonic aircraft on contrail coverage and contrail radiative forcing is investigated by means of simulations with the general circulation model ECHAM4.L39(DLR) including a contrail parameterization. The model simulations consider air traffic inventories of a subsonic fleet and of a combined fleet of sub- and supersonic aircraft for the years 2025 and 2050,

A. Stenke; V. Grewe; S. Pechtl

2007-01-01

103

Higher voltage aircraft power systems  

Microsoft Academic Search

Modern aircraft designs are focused on minimising the use of engine bleed air, eliminating gearboxes, and reducing the reliance on hydraulic systems. Instead, many of these mechanical systems will be replaced with electrical versions. The increasing amounts of electrical power that will be shipped through an aircraft means that it is increasingly difficult to rely on low voltage power systems

Ian Cotton; Andrew Nelms

2008-01-01

104

Aircraft wiring program status report  

NASA Astrophysics Data System (ADS)

In this Naval Air Warfare Center (NAWC) Aircraft Division status report, the general and wire and cable component activities, the systems engineering activities, the aircraft wiring lead maintenance activities, the NAVAIR/NASA interface activities, and the Base Realignment and Closure (BRAC) Commission recommendations are presented.

Beach, Rex

1995-11-01

105

Airfoil optimization for morphing aircraft  

Microsoft Academic Search

Continuous variation of the aircraft wing shape to improve aerodynamic performance over a wide range of flight conditions is one of the objectives of morphing aircraft design efforts. This is being pursued because of the development of new materials and actuation systems that might allow this shape change. The main purpose of this research is to establish appropriate problem formulations

Howoong Namgoong

2005-01-01

106

Aircraft landing using GPS  

NASA Astrophysics Data System (ADS)

The advent of the Global Positioning System (GPS) is revolutionizing the field of navigation. Commercial aviation has been particularly influenced by this worldwide navigation system. From ground vehicle guidance to aircraft landing applications, GPS has the potential to impact many areas of aviation. GPS is already being used for non-precision approach guidance; current research focuses on its application to more critical regimes of flight. To this end, the following contributions were made: (1) Development of algorithms and a flexible software architecture capable of providing real-time position solutions accurate to the centimeter level with high integrity. This architecture was used to demonstrate 110 automatic landings of a Boeing 737. (2) Assessment of the navigation performance provided by two GPS-based landing systems developed at Stanford, the Integrity Beacon Landing System, and the Wide Area Augmentation System. (3) Preliminary evaluation of proposed enhancements to traditional techniques for GPS positioning, specifically, dual antenna positioning and pseudolite augmentation. (4) Introduction of a new concept for positioning using airport pseudolites. The results of this research are promising, showing that GPS-based systems can potentially meet even the stringent requirements of a Category III (zero visibility) landing system. Although technical and logistical hurdles still exist, it is likely that GPS will soon provide aircraft guidance in all phases of flight, including automatic landing, roll-out, and taxi.

Lawrence, David Gary

107

41 CFR 102-33.240 - What must we consider before disposing of aircraft and aircraft parts?  

Code of Federal Regulations, 2013 CFR

...false What must we consider before disposing of aircraft and aircraft parts? 102-33.240 Section 102-33.240...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft...

2013-01-01

108

Amphibious discoidal aircraft  

US Patent & Trademark Office Database

An aircraft comprising a discoidal fuselage having a planar upper surface and containing at least one vertical duct extending longitudinally therethrough, an impeller located within the duct for producing an upward flow of gas, and a gas flow director movably mounted with respect to said duct. The vertical duct is central to the fuselage. The impeller is a vertical turbojet engine. The gas director comprises a central conical member, an upper annular flow control member, and a plurality of radially spaced apart vent controls. The vent controls are hydraulic cylinders. A hatch is mounted about the bottom opening of said duct. The hatch is movable such that one position seals the duct from the entry of liquids. An air passageway extends into and communicates with the duct.

del Castillo; Gilbert (Houston, TX)

1987-06-23

109

Safety factors in civil aircraft design requirements  

Microsoft Academic Search

Many factors influence the safety of modern civil aircraft. Some are related to design, others to the maintenance and operation of the aircraft. The factors and approaches employed vary with the type of aircraft. Those related to structural design relevant to large transport aircraft and to helicopters will be addressed in this paper.The means by which current and developing airworthiness

John W. Bristow; P. E. Irving

2007-01-01

110

The impact of aircraft noise control technology  

NASA Astrophysics Data System (ADS)

Reductions made in aircraft noise since the first generation jet aircraft are reviewed. The critical facts presently underpinning the airport noise situation are listed. The technologies which are responsible for the reduction in aircraft noise are reviewed and illustrated. Progress in noise control around airports is considered and future prospects concerning aircraft noise are discussed.

Smith, M. J. T.

1991-05-01

111

Aircraft Mechanics Series. Duty Task List.  

ERIC Educational Resources Information Center

|This task list is intended for use in planning and/or evaluating a competency-based course in aircraft mechanics. The guide outlines the tasks entailed in 24 different duties typically required of employees in the following occupations: airframe mechanic, power plant mechanic, aircraft mechanic, aircraft sheet metal worker, aircraft electrician,…

Oklahoma State Dept. of Vocational and Technical Education, Stillwater. Curriculum and Instructional Materials Center.

112

Real-time aircraft turnaround operations manager  

Microsoft Academic Search

Aircraft turnaround operations are the activities conducted to prepare an inbound aircraft at an airport for a following outbound flight that is scheduled for the same aircraft. The activities of aircraft turnaround operations include both the inbound and outbound exchanges of passengers, crew, catering services, cargo and baggage handling. Hence, appears the importance of following up on all activities done

M. Abd Allah Makhloof; M. Elsayed Waheed; Usama A. El-Raouf Badawi

2012-01-01

113

Aircraft Parts (Brazil). Aircraft and Parts, August 1991.  

National Technical Information Service (NTIS)

Because of Brazil's vast size, air transportation is an essential link in the country's infrastructure. Combining this dependence on air transport with an ongoing national policy to establish a modern market economy, U.S. commercial aircraft and parts man...

1991-01-01

114

Dichlorvos vapour disinsection of aircraft  

PubMed Central

The authors describe the testing of an automatic aircraft disinsection system permanently installed on a commercial DC-6B passenger aircraft. An air-compressor forces ambient cabin air, partially saturated with dichlorvos vapour at a set concentration, through the cabin, cockpit and baggage compartments of the aircraft for 30 minutes. Insecticide concentrations and insect mortality were observed in post-overhaul check flights, and insect mortality and passenger reactions were observed on scheduled flights between Miami, Florida, and Nassau, Bahamas. The results showed satisfactory biological efficiency. The passengers were unaware of the disinsection process and showed no signs of discomfort. ImagesFIG. 1FIG. 2FIG. 3

Jensen, Jens A.; Flury, Vincent P.; Schoof, Herbert F.

1965-01-01

115

Developments in Aircraft Structural Materials.  

National Technical Information Service (NTIS)

An overview of recent and ongoing development in aircraft structural materials is given. In view of current and predicted usage the most important developments concern aluminum alloys and advanced composites. Developments in titanum alloys, high strength ...

R. J. H. Wanhill W. Vanderhoeven W. G. J. T. Hart

1979-01-01

116

Subsonic Ultra Green Aircraft Research.  

National Technical Information Service (NTIS)

This Final Report summarizes the work accomplished by the Boeing Subsonic Ultra Green Aircraft Research (SUGAR) team in Phase 1, which includes the time period of October 2008 through March 2010. The team consisted of Boeing Research and Technology, Boein...

C. K. Droney M. K. Bradley

2011-01-01

117

Fluidic Emergency Thruster for Aircraft.  

National Technical Information Service (NTIS)

The design, development, fabrication and test evaluation of two prototype fluidic emergency thrusters (FET) for aircraft stabilization are discussed. The fluidic control units were designed to provide, between two diametrically opposed nozzles, a thrust d...

T. S. Honda

1972-01-01

118

Aircraft Lightning Electromagnetic Environment Measurement.  

National Technical Information Service (NTIS)

This paper outlines a NASA project plan for demonstrating a prototype lightning strike measurement system that is suitable for installation onto research aircraft that already operate in thunderstorms. This work builds upon past data from the NASA F106, F...

G. N. Szatkowski J. J. Ely T. X. Nguyen

2011-01-01

119

Innovative Materials for Aircraft Morphing.  

National Technical Information Service (NTIS)

Reported herein is an overview of the research being conducted within the Materials Division at NASA Langley Research Center on the development of smart material technologies for advanced airframe systems. The research is a part of the Aircraft Morphing P...

J. O. Simpson S. A. Wise R. G. Bryant R. J. Cano T. S. Gates J. A. Hinkley R. S. Rogowski K. S. Whitley

1997-01-01

120

Ground Aircraft Deicing Technology Review.  

National Technical Information Service (NTIS)

This report provides a review and update of operational, procedural, and system information regarding on-ground deicing of aircraft prior to flight. It reflects current practices of the different segments of aviation with the preponderance of information ...

D. Mayer J. Michitsch R. Yu

1986-01-01

121

Aircraft Noise Study in Norway.  

National Technical Information Service (NTIS)

An extensive study of aircraft noise is currently being conducted in Oslo, Norway. The traffic at Oslo Airport Fornebu that includes both national and international flights, totals approximately 350 movements per day: 250 of these are regular scheduled fl...

T. T. Gjestland K. H. Liasjo H. E. Bohn

1990-01-01

122

Fire Resistant Aircraft Hydraulic System.  

National Technical Information Service (NTIS)

This document reports a study to select a nonflammable hydraulic fluid for possible use in future military aircraft in which the Halocarbon Products Corporation AO-8 chlorotrifluoroethylene (CTFE) fluid was selected as the most promising fluid which meets...

E. T. Raymond D. W. Huling R. L. Shick E. C. Wagner W. E. Willard

1982-01-01

123

Aircraft hydraulic systems. Third edition  

SciTech Connect

The first nine chapters concern hydraulic components including: tubing, hoses, fittings, seals, pumps, valves, cylinders, and motors. General hydraulic system considerations are included in chapters five and nine, while pneumatic systems are covered in chapter ten. Chapters eleven through fifteen are devoted to aircraft-specific systems such as: landing gear, flight controls, brakes, etc. The material is rounded out with excerpts from the Canadair Challenger 601 training guide to illustrate the use of hydraulic systems in a specific aircraft application.

Neese, W.A.

1991-12-31

124

75 FR 32315 - Airworthiness Directives; Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engines  

Federal Register 2010, 2011, 2012, 2013

...series engine installed in various aircraft does not have an engine type certificate...instead, the engine is part of the aircraft type design. You may obtain further information...Relevant Service Information Rotax Aircraft Engines has issued Service...

2010-06-08

125

75 FR 50865 - Airworthiness Directives; Various Aircraft Equipped With Rotax Aircraft Engines 912 A Series Engines  

Federal Register 2010, 2011, 2012, 2013

...installed in various aircraft does not have an engine...engine is part of the aircraft type design. Comments We gave the...approved by the State of Design Authority (or their...20, 2007; and Rotax Aircraft Engines Service...

2010-08-18

126

Chemical hazards in aeromedical aircraft.  

PubMed

Several potentially hazardous chemicals are required to make modern military aircraft fly. With each airevac mission, the possibility exists for structural failure of a fluid system, resulting in contamination to flight/medical crews, patients, and passengers. Aeromedical Evacuation Crewmembers (AECMs) need to be aware of the hazardous chemicals used in aircraft and areas where there is an increased risk to those in and around the aircraft. This study identified potential areas for chemical leakage, such as refuel receptacles, hydraulic reservoirs, hydraulic motors, doors, ramps, engines, and more. Further, it identified the basic first aid procedures to perform on people contaminated with jet fuel, hydraulic fluid, engine oil, fire extinguisher agents, LOX and other fluids. First aid procedures are basic and can be performed with supplies and equipment on a routine aeromedical evacuation mission, AECMs trained in a basic awareness of hazardous aircraft chemicals will result in crews better prepared to cope with the unique risks of transporting patients in a complicated military aircraft. PMID:2923600

Tupper, C R

1989-01-01

127

Airfoil optimization for morphing aircraft  

NASA Astrophysics Data System (ADS)

Continuous variation of the aircraft wing shape to improve aerodynamic performance over a wide range of flight conditions is one of the objectives of morphing aircraft design efforts. This is being pursued because of the development of new materials and actuation systems that might allow this shape change. The main purpose of this research is to establish appropriate problem formulations and optimization strategies to design an airfoil for morphing aircraft that include the energy required for shape change. A morphing aircraft can deform its wing shape, so the aircraft wing has different optimum shapes as the flight condition changes. The actuation energy needed for moving the airfoil surface is modeled and used as another design objective. Several multi-objective approaches are applied to a low-speed, incompressible flow problem and to a problem involving low-speed and transonic flow. The resulting solutions provide the best tradeoff between low drag, high energy and higher drag, low energy sets of airfoil shapes. From this range of solutions, design decisions can be made about how much energy is needed to achieve a desired aerodynamic performance. Additionally, an approach to model aerodynamic work, which would be more realistic and may allow using pressure on the airfoil to assist a morphing shape change, was formulated and used as part of the energy objective. These results suggest that it may be possible to design a morphing airfoil that exploits the airflow to reduce actuator energy.

Namgoong, Howoong

128

19 CFR 122.132 - Sealing of aircraft liquor kits.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Sealing of aircraft liquor kits. 122.132 Section 122.132 Customs... AIR COMMERCE REGULATIONS Aircraft Liquor Kits § 122.132 Sealing of aircraft liquor kits. (a) Sealing required. Aircraft...

2013-04-01

129

19 CFR 122.132 - Sealing of aircraft liquor kits.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Sealing of aircraft liquor kits. 122.132 Section 122.132 Customs... AIR COMMERCE REGULATIONS Aircraft Liquor Kits § 122.132 Sealing of aircraft liquor kits. (a) Sealing required. Aircraft...

2010-04-01

130

19 CFR 122.132 - Sealing of aircraft liquor kits.  

Code of Federal Regulations, 2010 CFR

...2009-04-01 false Sealing of aircraft liquor kits. 122.132 Section 122.132 Customs... AIR COMMERCE REGULATIONS Aircraft Liquor Kits § 122.132 Sealing of aircraft liquor kits. (a) Sealing required. Aircraft...

2009-04-01

131

14 CFR 47.51 - Triennial aircraft registration report.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Triennial aircraft registration report. 47.51 Section 47.51...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Certificates of Aircraft...

2010-01-01

132

14 CFR 47.61 - Dealer's Aircraft Registration Certificates.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Dealer's Aircraft Registration Certificates. 47.61 Section 47...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Dealers' Aircraft Registration...

2013-01-01

133

14 CFR 47.33 - Aircraft not previously registered anywhere.  

Code of Federal Regulations, 2013 CFR

...Space 1 2013-01-01 2013-01-01 false Aircraft not previously registered anywhere. 47.33 Section...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Certificates of Aircraft...

2013-01-01

134

14 CFR 47.51 - Triennial aircraft registration report.  

Code of Federal Regulations, 2010 CFR

...2009-01-01 2009-01-01 false Triennial aircraft registration report. 47.51 Section 47.51...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Certificates of Aircraft...

2009-01-01

135

14 CFR 135.145 - Aircraft proving and validation tests.  

Code of Federal Regulations, 2013 CFR

...Space 3 2013-01-01 2013-01-01 false Aircraft proving and validation tests. 135.145 Section...OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Aircraft and Equipment § 135.145 Aircraft proving...

2013-01-01

136

Alternate Fuels for use in Commercial Aircraft  

Microsoft Academic Search

The engine and commercial aircraft research and development communities have been investigating the practicality of using alternative fuels in near, mid, and far-term aircraft. Presently, it appears that an approach of using a \\

David L. Daggett; Robert C. Hendricks; Edwin Corporan

137

Dynamics of Cables Towed from Aircraft.  

National Technical Information Service (NTIS)

The report describes a 'lumped mass' computer simulation of a trailing wire system towed by an orbiting aircraft. The USAF U-10 aircraft flight conditions were used as applied to three flightpaths: constant altitude circular, constant altitude elliptical,...

J. G. R. Hansen S. A. Crist

1972-01-01

138

Emerging NDE Technology for aging aircraft.  

National Technical Information Service (NTIS)

This paper presents an overview of several emerging nondestructive evaluation technologies that are being employed or considered for use to inspect commercial transport, commuter aircraft and military aircraft. An overview of the Federal Aviation Administ...

D. G. Moore R. L. Perry

1998-01-01

139

Airframe Certification Methods for Unmanned Aircraft.  

National Technical Information Service (NTIS)

The application of conventional structural certification methods to unmanned aircraft can lead to unacceptably long development times and costs that are out of line with the development costs for the airframe. The aircraft development community needs a di...

C. R. Saff

2006-01-01

140

Leases and Demonstrations of DOD Aircraft.  

National Technical Information Service (NTIS)

The Instruction establishes the Department of Defense policy and procedures for the leasing of DoD aircraft by the Military Departments to manufacturers for sales demonstrations, and the demonstration of DoD aircraft to foreign governments.

G. Sevier

1976-01-01

141

47 CFR 32.6113 - Aircraft expense.  

Code of Federal Regulations, 2011 CFR

...Accounts § 32.6113 Aircraft expense. (a) This account shall include such costs as aircraft fuel, flight crews, mechanics and ground crews, licenses and inspection fees, washing, repainting, and minor accessories. (b) Credits...

2011-10-01

142

47 CFR 32.6113 - Aircraft expense.  

Code of Federal Regulations, 2012 CFR

...Accounts § 32.6113 Aircraft expense. (a) This account shall include such costs as aircraft fuel, flight crews, mechanics and ground crews, licenses and inspection fees, washing, repainting, and minor accessories. (b) Credits...

2012-10-01

143

Photographic Measurements of USAF Aircraft Plume Rise.  

National Technical Information Service (NTIS)

This report includes data and results which were obtained during plume rise experimentation. Aircraft plumes were photographed using the smoke-producing F-102 drones, and Thunderbird T-38 aircraft. The second set of experiments indicated that, under low w...

P. D. Music J. S. Hunt D. F. Naugle

1977-01-01

144

Improved Methodology For Advanced Aircraft Design.  

National Technical Information Service (NTIS)

A set of related topics address aircraft that are significantly different from traditional aircraft. All of the effort relied upon multidisciplinary analysis tools, including finite element modeling, computational aerodynamic prediction, and aeroelastic a...

W. A. Crossley

2004-01-01

145

14 CFR 34.6 - Aircraft safety.  

Code of Federal Regulations, 2013 CFR

...FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT FUEL VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES General Provisions § 34.6 Aircraft safety. (a) The provisions of this part will...

2013-01-01

146

Crashworthiness Analysis of Commuter Aircraft Seats.  

National Technical Information Service (NTIS)

During the past several years, the Federal Aviation Regulations (FAR) have been significantly modified with respect to seat/restraint system strength, attachment of seats to the aircraft structure, and the means by which they are to be evaluated. Aircraft...

D. H. Laananen

1993-01-01

147

Modelling UHF Antenna Coupling on Aircraft.  

National Technical Information Service (NTIS)

Antenna coupling is of particular interest on aircraft where the structure interacts with the antenna arrays. These arrays may be extremely complex as new electronic countermeasures and signal intelligence systems are added to aircraft. The thesis attempt...

R. E. Koehler

1975-01-01

148

Lightning Effects on General Aviation Aircraft.  

National Technical Information Service (NTIS)

To determine the actual lightning vulnerability of typical light aircraft systems and components, and demonstrate the required vulnerability assessment techniques, analyses and laboratory tests were performed on several typical light aircraft and some of ...

J. A. Plumer

1973-01-01

149

Schedule B-43 Aircraft Inventory, 2008.  

National Technical Information Service (NTIS)

The inventory lists, in tabular form: Year aircraft was placed in service; serial number; tail number; aircraft status; operating status; number of seats; maker; model; capacity in pounds; and acquisition date.

2008-01-01

150

Aircraft Tire/Pavement Pressure Distribution.  

National Technical Information Service (NTIS)

This report presents tire/pavement pressure distributions calculated for seven different aircraft tires. The tires are main gear equipment on a variety of Air Force aircraft. The calculations were made with a finite element tire model developed previously...

J. T. Tielking

1989-01-01

151

50 CFR 27.34 - Aircraft.  

Code of Federal Regulations, 2010 CFR

...Violations: With Vehicles § 27.34 Aircraft. The unauthorized operation of aircraft, including sail planes, and hang gliders, at altitudes resulting in harassment of wildlife, or the unauthorized landing or take-off on a national...

2009-10-01

152

50 CFR 27.34 - Aircraft.  

Code of Federal Regulations, 2010 CFR

...Violations: With Vehicles § 27.34 Aircraft. The unauthorized operation of aircraft, including sail planes, and hang gliders, at altitudes resulting in harassment of wildlife, or the unauthorized landing or take-off on a national...

2010-10-01

153

Aircraft aerodynamic noise during approach  

NASA Astrophysics Data System (ADS)

The effect of approach velocity, nose and flap inclination, and undercarriage position on aircraft noise was studied. The A 300 B and SN 601 aircraft made two approach passes over a chain of noise recorders. The sound fields and noise spectra show that increasing the speed and flap angle or lowering the undercarriage produces a general increase in noise level such that the directivity of the aerodynamic noise source is hardly changed. All noise spectra increase. Pure frequencies (400 to 500 Hz) accompany flap deployment for the SN 601.

Parant, J. L.

154

Method and apparatus for monitoring aircraft components  

DOEpatents

Operability of aircraft mechanical components is monitored by analyzing the voltage output of an electrical generator of the aircraft. Alternative generators, for a turbine-driven rotor aircraft, include the gas producer turbine tachometer generator, the power turbine tachometer generator, and the aircraft systems power producing starter/generator. Changes in the peak amplitudes of the fundamental frequency and its harmonics are correlated to changes in condition of the mechanical components.

Dickens, Larry M. (Oak Ridge, TN); Haynes, Howard D. (Knoxville, TN); Ayers, Curtis W. (Clinton, TN)

1996-01-01

155

Analyses of Aircraft Responses to Atmospheric Turbulence  

Microsoft Academic Search

The response of aircraft to stochastic atmospheric turbulence plays an important role in aircraft-design (load calculations), Flight Control System (FCS) design and flight-simulation (handling qualities research and pilot training). In order to simulate these aircraft responses, an accurate mathematical model is required. Two classical models will be discussed in this thesis, that is the Delft University of Technology (DUT) model

W. H. J. J. Van Staveren

2003-01-01

156

Cognitive failure analysis for aircraft accident investigation  

Microsoft Academic Search

The present studies were undertaken to investigate the applicability of an information processing approach to human failure in the aircraft cockpit. Using data obtained from official aircraft accident investigation reports, a database of accidents and incidents involving New Zealand civil aircraft between 1982 and 1991 was compiled. In the first study, reports were coded into one of three error stages

DAVID OHARE; MARK WIGGINS; RICHARD BATT; DIANNE MORRISON

1994-01-01

157

COMBAT AIRCRAFT AGILITY METRICS - A REVIEW  

Microsoft Academic Search

With changing combat environments, traditional measures of merit for fighter aircraft per- formance have largely proved insufficient to analyze combat capability. Combat experience has shown that the upper hand lies with an aircraft that has superior maneuverability across a large part of the flight regime. Agility metrics have come to provide a tool that would be capable of evaluating aircraft

Aditya A. Paranjape; N. Ananthkrishnan

158

Aircraft Landing Gear Dynamics: Simulation and Control  

Microsoft Academic Search

The landing gear is an inevitable system for the aircraft. It absorbs the energy of the landing impact and carries the aircraft weight at all ground operations, including take off, taxiing, and towing. Numerical simulation has become an invaluable tool for the assessment of landing gear dynamics as well as of aircraft\\/landing gear interaction. This paper gives an overview of

W. KRÜGER; I. BESSELINK; D. COWLING; D. B. DOAN; W. KORTÜM; W. KRABACHER

1997-01-01

159

Robotic sensors for aircraft paint stripping  

Microsoft Academic Search

Aircraft of all types need to have paint routinely removed from their outer surfaces. Any method needs to be controlled to remove all the paint and not damage the surface of the aircraft. Human operators get bored with the monotonous task of stripping paint from an aircraft and thus do not control the process very well. This type of tedious

Richard J. Weniger

1990-01-01

160

14 CFR 21.127 - Tests: aircraft.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Tests: aircraft. 21.127 Section 21.127 Aeronautics...ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT CERTIFICATION PROCEDURES FOR PRODUCTS...Type Certificate § 21.127 Tests: aircraft. (a) Each person...

2013-01-01

161

Electromagnetic backscattering from aircraft propeller blades  

Microsoft Academic Search

This paper gives a theoretical solution to the problem of determining the electromagnetic backscattering and Doppler spectrum of an aircraft propeller as presented to a radar operating in the 8-12 GHz band. At this band for all practical aircraft propeller the electromagnetic backscattering regime is in the optical region. The solution proceeds by modeling the aircraft propeller as a set

S. Y. Yang; S. M. Yeh; S. S. Bor; S. R. Huang; C. C. Hwang

1997-01-01

162

NASA progress in aircraft noise prediction  

Microsoft Academic Search

Langley Research Center efforts to develop a methodology for predicting the effective perceived noise level (EPNL) produced by jet-powered CTOL aircraft to an accuracy of + or - 1.5 dB are summarized with emphasis on the aircraft noise prediction program (ANOPP) which contains a complete set of prediction methods for CTOL aircraft including propulsion system noise sources, aerodynamic or airframe

J. P. Raney; S. L. Padula; W. E. Zorumski

1981-01-01

163

Annoyance caused by aircraft en route noise  

Microsoft Academic Search

A laboratory experiment was conducted to quantify the annoyance response of people on the ground to enroute noise generated by aircraft at cruise conditions. The en route noises were ground level recordings of eight advanced turboprop aircraft flyovers and six conventional turbofan flyovers. The eight advanced turboprop enroute noises represented the NASA Propfan Test Assessment aircraft operating at different combinations

David A. McCurdy

1992-01-01

164

Dehydrated Soups for USAF Aircraft.  

National Technical Information Service (NTIS)

Laboratory tests were conducted on dehydrated soups for the development of soups for use aboard aircraft operating above 15,240 meters (50,000 feet). These tests involved storage studies on seven different commercially available soups after repacking in f...

H. Gorfien A. R. Rahman E. M. Powers D. E. Westcott

1974-01-01

165

Visualization for multiparameter aircraft designs  

Microsoft Academic Search

We describe an aircraft design problem in high dimen- sional space, with D typically being 10 to 30. In some respects this is a classic optimization problem, where the goal is to find the point that minimizes an objective function while satisfying a set of constraints. However, evaluating an individual point is expensive, and the high dimensionality makes many approaches

Clifford A. Shaffer; Duane L. Knill; Layne T. Watson

1998-01-01

166

Computational Aerodynamics for Aircraft Design  

Microsoft Academic Search

This article outlines some of the principal issues in the development of numerical methods for the prediction of flows over aircraft and their use in the design process. These include the choice of an appropriate mathematical model, the design of shock-capturing algorithms, the treatment of complex geometric configurations, and shape modifications to optimize the aerodynamic performance.

Antony Jameson

1989-01-01

167

Submersible Aircraft Concept Design Study.  

National Technical Information Service (NTIS)

The submersible aircraft study combines the speed and range of an airborne platform with the stealth of an underwater vehicle by developing a vessel that can both fly and submerge. The study explores the feasibility of a design capable of insertion and ex...

J. Eastgate R. Goddard

2010-01-01

168

EMISSIONLESS AIRCRAFT: REQUIREMENTS AND CHALLENGES  

Microsoft Academic Search

NASA's Office of Aerospace Technology (OAT) goals for aeronautics include protecting the local environmental quality and the global climate by reducing aircraft noise and emissions . In support of these objectives, the NASA Glenn Research Center has developed an Aeropropulsion Vision, which ultimately results in an emissionless, silent aeropropulsion system. This cleaner, quieter system is envisioned to rely on fuel

Timothy J. Wickenheiser; Arun K. Sehra; Gary T. Seng; Joshua E. Freeh; Jeffery J. Berton

169

Investigation of Fighter Aircraft Agility.  

National Technical Information Service (NTIS)

This report attempts to unify in a single document the results of a series of studies on fighter aircraft agility funded by the NASA Ames Research Center, Dryden Flight Research Facility and conducted at the University of Kansas Flight Research Laboratory...

J. Valasek D. R. Downing

1993-01-01

170

Development of Aircraft Brake Materials.  

National Technical Information Service (NTIS)

The requirements of brake materials were outlined and a survey made to select materials to meet the needs of high temperature brakes. A number of metals and ceramic materials were selected and evaluated in sliding tests which simulated aircraft braking. N...

T. L. Ho M. B. Peterson

1974-01-01

171

Lightning Stroke Damage to Aircraft  

Microsoft Academic Search

The paper describes a series of tests made in the period 1938 to 1942 to determine in the laboratory the effects of lightning strokes on the safe operation of aircraft. Due to wartime restrictions, publication was deferred. Investigated were: the burning of holes in the metal skin of planes and other metallic parts of planes; damage to airplane fuel tanks;

J. H. Hagenguth

1949-01-01

172

System design and aircraft integration  

NASA Astrophysics Data System (ADS)

The Integrated Helmet Audio/Visual System (IHAVS) suite is composed of the GEC Helmet Mounted Display (HMD), Armstrong Labs 3-D Audio system, Polhemus Head Tracker (HT) and SMiths Interactive Voice Module (IVM). The LORAL NITE Hawk Targeting Self Cooled IR pod (TFLIR) was added, supplementing the IHAVS for off-boresight target management. The lightweight HMD generates a high resolution visor projected display. Symbology displayed within the binocular and fully overlapped 40 degree field of view presents aircraft moding, navigation, weapon delivery, and threat data to the pilot. The 3-D Audio system generates four audio cues localized to within 10 degrees of the commanded position. THe specialized headset localizes TFLIR position and threat audio cues. The HT system provides helmet position to the aircraft, the HMD and 3-D Audio system. Twelve IVM digital voice output reports aircraft status. The T/AV-8B aircraft and avionics architecture are discussed laying the foundation for the described integration of the IHAVS suite. Integrated together, these systems provide the pilot with greatly increased field of regard for target recognition, designation and attack. Tightly coupled to the IHAVS suite, the TFLIR allows off-boresight target management and the field of regard is well matched and complements the IHAVS.

Flint, John R.

1996-06-01

173

The cleveland aircraft fire tests  

Microsoft Academic Search

On June 30 and July 1, 1966, tests were conducted to evaluate high expansion foam’s ability to extend the time for which an\\u000a aircraft passenger cabin environment would remain survivable during a post-crash five. While some results tend to confirm\\u000a those of similar tests, others may shed new light on the problem.

James J. Brenneman; Captain Donald A. Heine

1968-01-01

174

CFD for hypersonic airbreathing aircraft  

Microsoft Academic Search

A general discussion is given on the use of advanced computational fluid dynamics (CFD) in analyzing the hypersonic flow field around an airbreathing aircraft. Unique features of the hypersonic flow physics are presented and an assessment is given of the current algorithms in terms of their capability to model hypersonic flows. Several examples of advanced CFD applications are then presented.

Ajay Kumar

1989-01-01

175

Aircraft Icing Handbook (1993 Update).  

National Technical Information Service (NTIS)

The first update of the Aircraft Icing Handbook does not change the organization of the handbook into volumes and chapters as delineated on page vii. However, new sections have been added to Chapter III - Ice Protection Methods. Section 1.0 no longer cont...

1993-01-01

176

Disturbance Caused by Aircraft Noise.  

National Technical Information Service (NTIS)

Noise pollution caused by the presence of airfields adjacent to residential areas is studied. Noise effects on the sleep of residents near airports and the degree of the residents noise tolerance are evaluated. What aircraft noises are annoying and to wha...

R. Josse

1980-01-01

177

Beamforming for aircraft noise measurements  

Microsoft Academic Search

Phased array beamforming for aircraft noise source location has a long history, including early work on jet noise, wind tunnel measurements, and flyover testing. In the last 10 years, advancements in sparse 2-D and 3-D arrays, wind tunnel test techniques, and computer power have made phased array measurements almost common. Large aerospace companies and national research institutes have an advantage

Robert P. Dougherty

2003-01-01

178

NASA Now Minute: Model Aircraft  

NASA Video Gallery

In this episode of NASA Now, Sam James discusses why NASA engineers build model aircraft as well as the materials and steps involved in the building process. NASA Now Minutes are excerpts from a weekly current events program available for classroom use at the NASA Explorer Schools Virtual Campus located at: › http://explorerschools.nasa.gov.

Heather Deiss

2012-05-29

179

Aircraft Mechanics: Scope and Sequence.  

ERIC Educational Resources Information Center

|This scope and sequence guide, developed for an aircraft mechanics vocational education program, represents an initial step in the development of a systemwide articulated curriculum sequence for all vocational programs within the Metropolitan Nashville Public School System. It was developed as a result of needs expressed by teachers, parents, and…

Nashville - Davidson County Metropolitan Public Schools, TN.

180

Survival analysis of aging aircraft  

NASA Astrophysics Data System (ADS)

This study pushes systems engineering of aging aircraft beyond the boundaries of empirical and deterministic modeling by making a sharp break with the traditional laboratory-derived corrosion prediction algorithms that have shrouded real-world failures of aircraft structure. At the heart of this problem is the aeronautical industry's inability to be forthcoming in an accurate model that predicts corrosion failures in aircraft in spite of advances in corrosion algorithms or improvements in simulation and modeling. The struggle to develop accurate corrosion probabilistic models stems from a multitude of real-world interacting variables that synergistically influence corrosion in convoluted and complex ways. This dissertation, in essence, offers a statistical framework for the analysis of structural airframe corrosion failure by utilizing real-world data while considering the effects of interacting corrosion variables. This study injects realism into corrosion failures of aging aircraft systems by accomplishing four major goals related to the conceptual and methodological framework of corrosion modeling. First, this work connects corrosion modeling from the traditional, laboratory derived algorithms to corrosion failures in actual operating aircraft. This work augments physics-based modeling by examining the many confounding and interacting variables, such as environmental, geographical and operational, that impact failure of airframe structure. Examined through the lens of censored failure data from aircraft flying in a maritime environment, this study enhances the understanding between the triad of the theoretical, laboratory and real-world corrosion. Secondly, this study explores the importation and successful application of an advanced biomedical statistical tool---survival analysis---to model censored corrosion failure data. This well-grounded statistical methodology is inverted from a methodology that analyzes survival to one that examines failures. Third, this work demonstrates the development of a probabilistic corrosion failure model using survival analysis methods and techniques. Using a parsimonious approach, the coefficients of a Cox proportional hazards model were derived from a set of environmental, geographical and operational predictor variables. To determine if the variables satisfied the proportional hazard assumption, numerous statistical tests were performed---such as the equivalence tests of the log rank, Wilcoxon, Peto-Peto and Fleming-Harrington---and graphical plots generated such as observed-versus-expected plots and log(-log) survival curves. Finally, in a paradigm enhancement to current design methodologies, this dissertation place sets survival analysis modeling in the context of an emerging holistic structural integrity philosophy. While traditional aircraft design and life prediction methodologies consider only the cyclic fatigue domain without consideration to the environmental or unique operating spectrum that aircraft may fly in, a holistic approach considers the cradle-to-grave driving forces in the life of a component, such as corrosion assisted crack nucleation in a material. This dissertation, which uses real-world failure data obtained from structural aircraft components, is poised to narrow the cradle-to-grave loop and provide holistic feedback in the understanding of aircraft structural system failures.

Benavides, Samuel

181

Acoustics technologies for STOVL aircraft  

Microsoft Academic Search

State-of-the-art acoustic fatigue technologies that are relevant to supersonic Short Takeoff\\/Vertical Landing (STOVL) aircraft are investigated. Data and methods assessments of acoustic fatigue technologies for acoustic load predictions and stress response predictions are evaluated. Subsonic and supersonic jet noise generation mechanisms, axisymmetric and two-dimensional nozzles, and noise suppression methods are discussed. STOVL far field noise during hover, near field noise,

David S. Groen

1988-01-01

182

Aircraft Joints and Corrosion Control  

Microsoft Academic Search

\\u000a Corrosion damage in aircraft structure, if undetected and\\/or left untreated, can undermine safety. Currently corrosion prevention\\u000a and management in many civil and military fleets still relies strongly on the use of traditional ‘find and fix’ maintenance\\u000a practices, although this has been refined by the increasing use of Corrosion Prevention and Control Plans (CPCP) which provide\\u000a a framework for targeted inspections

Ung Hing Tiong; Graham Clark

183

Fuel for future transport aircraft  

SciTech Connect

On an analytical basis, liquid hydrogen has been shown to be a very attractive fuel for transport aircraft. An experimental research and development program is needed to advance theory to practice so LH/sub 2/ can be considered a viable alternative to synthetic kerosine as a replacement for conventional, petroleum-base Jet A. A comprehensive RandD program has been formulated for implementation on an international basis. 6 refs.

Brewer, G.D.

1981-08-01

184

EXPERIMENTAL DETERMINATION OF UNMANNED AIRCRAFT  

Microsoft Academic Search

This paper presents the methodology used in the experimental determination of the inertial properties of an unmanned aerial vehicle (UAV). This UAV is a prototype aircraft made of ply wood, balsa wood and aluminum, with a wingspan of 2,5m. A compound-pendulum is used to determine moments of inertia about transversal, longitudinal and vertical axes. The vertical location of the center

185

Digital HUDs for tactical aircraft  

NASA Astrophysics Data System (ADS)

For over four decades the Head Up Display (HUD) has been a critical instrument in tactical aircraft, as well as in an increasing number of commercial air transports. HUDs provide a unique means to present vital information to the pilot, precisely overlaid on the real world, without the need to look down or refocus onto the instrument panel displays. HUD imaging technology, using high brightness CRTs, has remained largely unchanged during this period, despite dramatic advances in display technology across the remainder of the avionics spectrum. As reliability improvements have reduced life cycle costs for other avionics systems, the relative cost of ownership for CRT-based HUDs has become increasingly unacceptable. Further, as special-purpose CRTs have steadily been replaced by digital display alternatives the number of potential sources has dwindled, raising growing parts obsolescence issues. These issues can be resolved by replacing the CRT and its associated electronics with a solid-state digital image engine. Such "digital" HUDs (DHUDs) have been certified for use in a number of commercial air transports, and are gaining wide acceptance in the user community. The operational and environmental requirements for DHUDs for tactical aircraft are more demanding than for transports, however the core technologies are in place to meet these needs. The stage is set to achieve excellent performance, dramatic life cycle cost reductions and low cost, for both legacy and new tactical aircraft. This paper describes digital HUD development efforts to date and summarizes key performance parameters and design issues.

Kalmanash, Michael H.

2006-06-01

186

A composite model of aircraft noise  

NASA Astrophysics Data System (ADS)

In the present method for reducing the amount of computation needed to determine the aircraft noise levels affecting communities, it is assumed that each aircraft can be assigned to one of several known flight paths. The invoked concept of 'energy addition' raises the possibility, for the purposes of simulation, of replacing a number of aircraft moving along a specified trajectory with a single 'equivalent source' that delivers the same weighted average power distribution to points on the ground.

Melton, R. G.

1985-05-01

187

New aircraft technologies - Challenges for dependability  

Microsoft Academic Search

Advances being planned in the commercial aircraft business, which include those in the areas of E-ETOPS, HSCT, fly-by-wire, and fly-by-light pose the question of their dependability. The paper defines the concept of dependability as it refers to aircraft equipment, the characteristics which a dependable aircraft equipment should possess, the use of the Dependable Computing techniques during the design and development

Tilak C. Sharma

1992-01-01

188

19 CFR 10.183 - Duty-free entry of civil aircraft, aircraft engines, ground flight simulators, parts, components...  

Code of Federal Regulations, 2010 CFR

...2009-04-01 2009-04-01 false Duty-free entry of civil aircraft, aircraft engines...OF THE TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. General... Civil Aircraft § 10.183 Duty-free entry of civil aircraft, aircraft...

2009-04-01

189

19 CFR 10.183 - Duty-free entry of civil aircraft, aircraft engines, ground flight simulators, parts, components...  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Duty-free entry of civil aircraft, aircraft engines...OF THE TREASURY ARTICLES CONDITIONALLY FREE, SUBJECT TO A REDUCED RATE, ETC. General... Civil Aircraft § 10.183 Duty-free entry of civil aircraft, aircraft...

2010-04-01

190

New aircraft technologies - Challenges for dependability  

NASA Astrophysics Data System (ADS)

Advances being planned in the commercial aircraft business, which include those in the areas of E-ETOPS, HSCT, fly-by-wire, and fly-by-light pose the question of their dependability. The paper defines the concept of dependability as it refers to aircraft equipment, the characteristics which a dependable aircraft equipment should possess, the use of the Dependable Computing techniques during the design and development of new equipment, and the new technology application to the current 777 program. Consideration is also given to the certification requirements for transport aircraft systems in terms of reliability, integrity, and availability.

Sharma, Tilak C.

191

AIRTV: Broadband Direct to Aircraft  

NASA Astrophysics Data System (ADS)

Airlines have been continuously upgrading their wide-body, long-haul aircraft with IFE (in-flight entertainment) systems that can support from 12 to 24 channels of video entertainment as well as provide the infrastructure to enable in-seat delivery of email and internet services. This is a direct consequence of increased passenger demands for improved in-flight services along with the expectations that broadband delivery systems capable of providing live entertainment (news, sports, financial information, etc.) and high speed data delivery will soon be available. The recent events of Sept. 11 have slowed the airline's upgrade of their IFE systems, but have also highlighted the compelling need for broadband aeronautical delivery systems to include operational and safety information. Despite the impact of these events, it is estimated that by 2005 more than 3000 long haul aircraft (servicing approximately 1 billion passengers annually) will be fully equipped with modern IFE systems. Current aircraft data delivery systems, which use either Inmarsat or NATS, are lacking in bandwidth and consequently are unsuitable to satisfy passenger demands for broadband email/internet services or the airlines' burgeoning data requirements. Present live video delivery services are limited to regional coverage and are not readily expandable to global or multiregional service. Faced with a compelling market demand for high data transport to aircraft, AirTV has been developing a broadband delivery system that will meet both passengers' and airlines' needs. AirTV is a global content delivery system designed to provide a range of video programming and data services to commercial airlines. When AirTV is operational in 2004, it will provide a broadband connection directly to the aircraft, delivering live video entertainment, internet/email service and essential operational and safety data. The system has been designed to provide seamless global service to all airline routes except for those over the poles. The system consists of a constellation of 4 geostationary satellites covering the earth and delivering its signals to the aircraft at S band (2.52 -2.67 GHz). The S-band spectrum is ideal for this application since it is allocated on a primary basis by the ITU for global broadcast service. The AirTV service is expected to begin in 2004 and should be unencumbered by adjacent satellite interference due to near completion of the ITU coordination process. Each satellite will deliver four 20 Mbps QPSK data streams consisting of multiplexed compressed digital video channels and IP data over the full global beam coverage. The 80 Mbps capacity of each satellite will provide approximately 60 video channels while still allocating 40 Mbits to data services. The combined constellation capacity of 320 Mbits will significantly exceed the capacity of any similar existing or currently planned global satellite system. In addition, the simplicity of the 4-satellite approach is the most cost effective means to deliver high bandwidth globally. Return links, which are required for internet service, will be provided through the existing Inmarsat Aero-H system already onboard virtually all long haul aircraft and will provide return data rates from the aircraft as high as 432 kbps. integrated receiver/decoder (IRD) assembly. The phased array antenna, a key technology element, is being developed by AirTV's strategic partner, CMC Electronics. This antenna is a scaled version of CMC's Inmarsat Aero H antenna and is capable of scanning to 5 degrees above the horizon. Wide angle scanning up to 85 degrees from zenith is necessary for aircraft traversing the northernmost latitudes on transoceanic routes. AirTV has designed both the satellite coverage and aircraft antenna performance to ensure that high signal quality is maintained along all non-polar airline routes. AirTV will be the future of aeronautical broadband delivery. It has been designed specifically for global services and uses the ideal spectrum for this application. It will revolutionize the delivery of content t

Sorbello, R.; Stone, R.; Bennett, S. B.; Bertenyi, E.

2002-01-01

192

14 CFR 252.11 - Aircraft on the ground.  

Code of Federal Regulations, 2013 CFR

...PROCEEDINGS) ECONOMIC REGULATIONS SMOKING ABOARD AIRCRAFT § 252.11 Aircraft... (a) Air carriers shall prohibit smoking whenever the aircraft is on the ground. (b) With respect to the restrictions on smoking described in § 252.5, foreign air...

2013-01-01

193

14 CFR 137.71 - Records: Commercial agricultural aircraft operator.  

Code of Federal Regulations, 2013 CFR

...Records: Commercial agricultural aircraft operator. 137.71 Section...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...AND OPERATIONS AGRICULTURAL AIRCRAFT OPERATIONS Records and Reports...Records: Commercial agricultural aircraft operator. (a) Each...

2013-01-01

194

14 CFR 121.163 - Aircraft proving tests.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Aircraft proving tests. 121.163...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...AND SUPPLEMENTAL OPERATIONS Aircraft Requirements § 121.163 Aircraft proving tests. (a)...

2013-01-01

195

14 CFR 135.419 - Approved aircraft inspection program.  

Code of Federal Regulations, 2010 CFR

...2009-01-01 false Approved aircraft inspection program. 135...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Maintenance, Preventive...Alterations § 135.419 Approved aircraft inspection program....

2009-01-01

196

14 CFR 121.463 - Aircraft dispatcher qualifications.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Aircraft dispatcher qualifications...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...AND SUPPLEMENTAL OPERATIONS Aircraft Dispatcher Qualifications and...Operations § 121.463 Aircraft dispatcher...

2013-01-01

197

78 FR 57104 - Airworthiness Directives; Diamond Aircraft Industries Airplanes  

Federal Register 2010, 2011, 2012, 2013

...2120-AA64 Airworthiness Directives; Diamond Aircraft Industries Airplanes AGENCY...new airworthiness directive (AD) for Diamond Aircraft Industries Model DA 40 and DA...identified in this proposed AD, contact Diamond Aircraft Industries GmbH, N.A....

2013-09-17

198

22 CFR 121.3 - Aircraft and related articles.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Aircraft and related articles. 121.3 Section 121.3 Foreign Relations...UNITED STATES MUNITIONS LIST Enumeration of Articles § 121.3 Aircraft and related articles. In Category VIII, aircraft...

2013-04-01

199

Electromagnetic Reverberation Characteristics of a Large Transport Aircraft.  

National Technical Information Service (NTIS)

A demonstration test to investigate the reverberation characteristics of the avionics bay and cockpit of a typical commercial aircraft was conducted on a decommissioned Boeing 707-720B aircraft. The aircraft, located at the Aerospace Maintenance and Regen...

M. O. Hatfield G. J. Freyer D. M. Johnson C. L. Farthing

1994-01-01

200

Evaluation of Contrail Reduction Strategies Based on Aircraft Flight Distances.  

National Technical Information Service (NTIS)

This paper evaluates a set of contrail reduction strategies based on the flight range of aircraft as contrail reduction strategies have different impacts on aircraft depending on how they plan to fly. In general, aircraft with longer flight distances crui...

B. Sridhar H. K. Ng J. Li N. Y. Chen

2012-01-01

201

27 CFR 31.91 - Passenger trains, aircraft, and vessels.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 false Passenger trains, aircraft, and vessels...Multiple Locations § 31.91 Passenger trains, aircraft, and vessels...that business throughout the passenger carrying train, aircraft, boat, or...

2013-04-01

202

32 CFR 855.15 - Detaining an aircraft.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Detaining an aircraft. 855.15 Section 855.15 National Defense...Defense (Continued) DEPARTMENT OF THE AIR FORCE AIRCRAFT CIVIL AIRCRAFT USE OF UNITED STATES AIR FORCE AIRFIELDS...

2013-07-01

203

14 CFR 121.153 - Aircraft requirements: General.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 2013-01-01 false Aircraft requirements: General. 121.153 Section...DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS Aircraft Requirements § 121.153 Aircraft requirements: General. (a) Except...

2013-01-01

204

14 CFR 135.419 - Approved aircraft inspection program.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Approved aircraft inspection program. 135.419 Section...RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Maintenance, Preventive Maintenance, and Alterations § 135.419 Approved aircraft inspection program. (a)...

2013-01-01

205

10 CFR 50.150 - Aircraft impact assessment.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Aircraft impact assessment. 50.150 Section...Approvals § 50.150 Aircraft impact assessment. (a) Assessment...maintained. (2) Aircraft impact characteristics .1 The assessment must be based...

2010-01-01

206

Acoustics technologies for STOVL aircraft  

NASA Astrophysics Data System (ADS)

State-of-the-art acoustic fatigue technologies that are relevant to supersonic Short Takeoff/Vertical Landing (STOVL) aircraft are investigated. Data and methods assessments of acoustic fatigue technologies for acoustic load predictions and stress response predictions are evaluated. Subsonic and supersonic jet noise generation mechanisms, axisymmetric and two-dimensional nozzles, and noise suppression methods are discussed. STOVL far field noise during hover, near field noise, and internal cockpit noise levels are predicted. Stress response prediction methods for acoustic, thermal, and maneuvering loads are addressed and the need for structural analysis methods with all three types of loads applied simultaneously is assessed.

Groen, David S.

1988-04-01

207

41 CFR 102-33.415 - When may we declassify an aircraft and remove it from our Federal aircraft inventory?  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false When may we declassify an aircraft and remove it from our Federal aircraft inventory? 102-33.415 Section 102-33...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Reporting Information on Government...

2013-01-01

208

19 CFR 10.183 - Duty-free entry of civil aircraft, aircraft engines, ground flight simulators, parts, components...  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Duty-free entry of civil aircraft, aircraft engines, ground flight simulators, parts, components...REDUCED RATE, ETC. General Provisions Civil Aircraft § 10.183 Duty-free entry of civil...

2013-04-01

209

Development of Morphing Aircraft Structure Using SMP.  

National Technical Information Service (NTIS)

The U.S. Air Force needs new aircraft which provide longer flight time, less fuel consumption, better aerodynamics in order to perform Air Force missions successfully as the mission environment changes rapidly. A morphing wing aircraft is considered as a ...

S. Jee

2010-01-01

210

Unmanned Aircraft Systems (UAS) Sensor and Targeting.  

National Technical Information Service (NTIS)

This Test Operations Procedure (TOP) 07-1-003 covers the span of requirements and technologies that are unique to Unmanned Aircraft Systems (UASs). The role of a UAS is significantly different than that of a manned aircraft. The nominal operating altitude...

2010-01-01

211

Advanced turboprop aircraft flyover noise annoyance  

Microsoft Academic Search

Results from recent laboratory experiments in which human subjects were exposed to synthetic sounds simulating the flyover noise emitted by advanced turbofan aircraft engines are briefly summarized. The Aircraft Noise Synthesis System described by McCurdy et al. (1987) is used to simulate the noise from (1) a conventional turboprop engine, (2) a jet engine, (3) a single-rotating turbofan engine, and

David A. McCurdy

1989-01-01

212

Emerging NDE Technology for aging aircraft  

SciTech Connect

This paper presents an overview of several emerging nondestructive evaluation technologies that are being employed or considered for use to inspect commercial transport, commuter aircraft and military aircraft. An overview of the Federal Aviation Administration (FAA) Airworthiness Assurance NDI Validation Center (AANC) is described and how AANC teams with industry, universities, and other federal entities to assess these technologies.

Moore, D.G.; Perry, R.L.

1998-03-01

213

Virtual Collaboration Environment for Aircraft Design  

Microsoft Academic Search

This paper presents a virtual collaboration environment for aircraft design. The presented system, abbreviated as VCEAD, provides virtual prototyping and communication features for synchronous collaboration between geographically distributed designers. Concurrent design reviews on large scale objects, such as aircraft fuselage, are possible over distance due to the technological choices of the system. These include XML, VRML and Java based solutions

Markus D. Durstewitz; Bernhard Kiefner; Reimund Kueke; Heikki Putkonen; Pertti Repo; Tuomo Tuikka

2002-01-01

214

New realities in aircraft design and manufacture  

Microsoft Academic Search

Considers how Boeing Computer Services in Seattle is developing two real-time applications-one in virtual reality, the other in what the company calls augmented reality, aimed at putting more information directly in front of the engineers designing aircraft and the manufacturing workers who build them. Boeing's virtual reality project plans to import aircraft CAD data to a VR environment where engineers

D. Sims

1994-01-01

215

Robust design optimization method for aircraft  

Microsoft Academic Search

The robustness problem in the aircraft design optimization is discussed in reference to the undulation of aircraft performance derived from uncertainty factors. A new robust design optimization (RDO) model, the constrained condition method (CCM), is expounded perspicuously. By dint of genetic algorithm (GA) joining with Back Propagation neural networks response surface (BP-NNRS), two optimal schemes, so called RDO scheme and

Wengong Meng; Dongli Ma

2010-01-01

216

V-22 Osprey Joint Advanced Vertical Aircraft.  

National Technical Information Service (NTIS)

The V-22 Osprey Joint Advanced Vertical Aircraft (V-22) is a tilt- rotor, short-take-off-and-landing aircraft, which was developed to fulfill multi-Service operational requirements. The V-22 operates as a helicopter for takeoffs and landings and, once air...

T. F. Gimble M. L. Ugone C. M. Santoni R. L. Shaffer J. A. Hoyt

2000-01-01

217

Soft Airfield Tests with F-4 Aircraft.  

National Technical Information Service (NTIS)

Tests were conducted to investigate the interaction of soil surfaces with the landing gear of F-4E aircraft to validate computer prediction routines. Site selection and soil tests are described. In-place soil tests were conducted, and aircraft ground perf...

V. Cassino

1981-01-01

218

Aircraft towing feasibility study. Final report  

SciTech Connect

Energy costs and availability are major concerns in most parts of the world. Many ways of increasing energy supply and reducing consumption are being proposed and investigated. One that holds considerable promise is the extended towing of aircraft between airport runways and terminal gate areas with engines shut down. This study provides a preliminary assessment of the constraints on and feasibility of extended aircraft towing. Past aircraft towing experience and the state-of-the-art in towing equipment are reviewed. Safety and operational concerns associated with aircraft towing are identified, and the benefits and costs of implementing aircraft towing at 20 major US airports are analyzed. It was concluded that extended aircraft towing is technically feasible and that substantial reductions in aircraft fuel consumption and air pollutant emissions can be achieved through its implementation. It was also concluded that, although capital and operating costs associated with towing would be increased, net savings could generally be attained at these airports. Because of the lack of past experience and the necessity of proving the cost effectiveness of the towing concept, a demonstration of the feasibility of large-scale aircraft towing is necessary. The study evaluates the suitability of the 20 study airports as potential demonstration sites and makes recommendations for the first demonstration project.

Not Available

1980-09-01

219

Avion Stabilite Variable (Variable Stability Aircraft).  

National Technical Information Service (NTIS)

The report gives a general description of the first French variable stability aircraft. The aircraft was designed by the 'Centre d'Essais en Vol' and the 'Societe Francaise d'Equipements pour la Navigation Aerienne'. Modifications to the airframe of the b...

G. Klopfstein

1966-01-01

220

Pulsed laser mapping system for light aircraft  

Microsoft Academic Search

A demonstration airborne laser mapping system for light aircraft has been tested in a Cessna 206 single-engine aircraft. Data from the test runs compare favorably with the ground truth data. Preliminary assessments indicate that vertical profiles and horizontal positions are accurate to within 2 m.

C. McDonough; G. Dryden; T. Sofia; S. Wisotsky; P. Howes

1980-01-01

221

Artificial Neural Network Modeling of Damaged Aircraft.  

National Technical Information Service (NTIS)

Aircraft design and control techniques rely on the proper modeling of the aircraft's equations of motion. Many of the variables used in these equations are aerodynamic coefficients which are obtained from scale models in wind tunnel tests. In order to mod...

C. A. Brunger

1994-01-01

222

A Wind Tunnel Captive Aircraft Testing Technique.  

National Technical Information Service (NTIS)

A captive aircraft testing technique has been developed for use in the 16-ft wind tunnels at the Arnold Engineering Development Center (AEDC). With the captive system, an aircraft motion study may be conducted in the wind tunnel with the tunnel acting as ...

R. W. Butler

1976-01-01

223

Aircraft monitoring of surface carbon dioxide exchange  

Microsoft Academic Search

Aircraft-mounted sensors were used to measure the exchange of carbon dioxide above a cornfield, a forest, and a lake under midday conditions. Mean absorption values of 3400, 1200, and 100 milligrams of carbon dioxide per square meter per hour, respectively, are consistent with reported ground-based observations of carbon dioxide flux. Such information, gathered by aircraft, could be used to provide

R. L. Desjardins; P. Alvo; P. H. Schuepp

1982-01-01

224

Aircraft Monitoring of Surface Carbon Dioxide Exchange  

Microsoft Academic Search

Aircraft-mounted sensors were used to measure the exchange of carbon dioxide above a cornfield, a forest, and a lake under midday conditions. Mean absorption values of 3400, 1200, and 100 milligrams of carbon dioxide per square meter per hour, respectively, are consistent with reported ground-based observations of carbon dioxide flux. Such information, gathered by aircraft, could be used to provide

R. L. Desjardins; E. J. Brach; P. Alvo; P. H. Schuepp

1982-01-01

225

Prediction of anthropometric accommodation in aircraft cockpits  

Microsoft Academic Search

Designing aircraft cockpits to accommodate the wide range of body sizes existing in the U.S. population has always been a difficult problem for Crewstation Engineers. The approach taken in the design of military aircraft has been to restrict the range of body sizes allowed into flight training, and then to develop standards and specifications to ensure that the majority of

Gregory Franklin Zehner

2000-01-01

226

Tug-TOW Arrangement for Nuclear Aircraft.  

National Technical Information Service (NTIS)

An operationally-integrated combination of aircraft is disclosed. It includes a rug airplane powered by a radiation-emitting power source, a tow aircraft adapted to carry a crew, a coupling between the airplanes to permit unpowered flight of the tow aircr...

S. Bernstein

1965-01-01

227

Vision-only aircraft flight control  

Microsoft Academic Search

Building aircraft with navigation and control systems that can complete flight tasks is complex, and often involves integrating information from multiple sensors to estimate the state of the vehicle. This paper describes a method, in which a glider can fly from a starting point to a predetermined and location (target) precisely using vision only. Using vision to control an aircraft

Christophe De Wagter; A. A. Proctor; E. N. Johnson

2003-01-01

228

Smart Icing Systems for Aircraft Icing Safety  

Microsoft Academic Search

Ice accretion affects the performance and control of an aircraft and in extreme situations can lead to incidents and accidents. However, changes in performance and control are difficult to sense. As a result, the icing sensors currently in use sense primarily ice accretion, not the effect of the ice. No processed aircraft performance degradation information is available to the pilot.

Michael B. Bragg; Tamer Basar; William R. Perkins; Michael S. Selig

2002-01-01

229

Assessment of NASA's Aircraft Noise Prediction Capability.  

National Technical Information Service (NTIS)

A goal of NASA s Fundamental Aeronautics Program is the improvement of aircraft noise prediction. This document provides an assessment, conducted from 2006 to 2009, on the current state of the art for aircraft noise prediction by carefully analyzing the r...

M. D. Dahl

2012-01-01

230

An aircraft noise study in Norway  

Microsoft Academic Search

An extensive study of aircraft noise is currently being conducted in Oslo, Norway. The traffic at Oslo Airport Fornebu that includes both national and international flights, totals approximately 350 movements per day: 250 of these are regular scheduled flights with intermediate and large size aircraft, the bulk being DC9 and Boeing 737. The total traffic during the summer of 1989

Truls T. Gjestland; Kare H. Liasjo; Hans Einar Bohn

1990-01-01

231

Parametric geometry representation to support aircraft design  

Microsoft Academic Search

Knowledge Based Engineering (KBE) plays an important role in automation and optimization of the aircraft design process. But the lack of real KBE tools limits the promise of Knowledge Based Engineering. To address this deficiency, we propose using the Python programming language to develop viable KBE application tools for aircraft design. Selecting geometric parameterization algorithms is fundamental to automation and

Marcos Elgueta Soulat

2012-01-01

232

Vertical tail buffeting of fighter aircraft  

Microsoft Academic Search

Vertical tail buffeting at high angles of attack is a phenomenon associated with the impact of vortical flows generated by the aircraft on the fins. This poses a serious problem for both single- and twin-tail fighter aircraft from the point of view of combat maneuverability and structural integrity. The research activities to understand the flow physics with an aim to

B. H. K. Lee

2000-01-01

233

Intelligent Tutor System for Visual Aircraft Recognition.  

National Technical Information Service (NTIS)

Visual aircraft recognition (VACR) is a critical skill for U.S. Army Short Range Air Defense (SHORAD) soldiers. It is the most reliable means of identifying aircraft, however VACR skills are not easy to teach or learn, and once learned they are highly deg...

L. W. Campbell

1990-01-01

234

Inerting Aircraft Fuel Systems Using Exhaust Gases.  

National Technical Information Service (NTIS)

Our purpose in this proposal was to determine the feasibility of using carbon dioxide, possibly obtained from aircraft exhaust gases as a substance to inert the fuel contained in fuel tanks aboard aircraft. To do this, we decided to look at the effects ca...

D. G. Hehemann

2002-01-01

235

Comparison of Military and Commercial Aircraft Development.  

National Technical Information Service (NTIS)

When compared to the commercial sector, it takes the military almost four times longer to develop an aircraft. For example, Boeing Company developed the 767 jetliner in about four years whereas the Navy's next generation tactical aircraft, the AX, is expe...

M. S. Mutty

1993-01-01

236

Aircraft of Today. Aerospace Education I.  

ERIC Educational Resources Information Center

|This textbook gives a brief idea about the modern aircraft used in defense and for commercial purposes. Aerospace technology in its present form has developed along certain basic principles of aerodynamic forces. Different parts in an airplane have different functions to balance the aircraft in air, provide a thrust, and control the general…

Savler, D. S.

237

Advanced Aircraft Secondary Power System Design  

Microsoft Academic Search

This paper describes the requirements, the secondary power system design, and the results of a trade study for an Advanced Aircraft Secondary Power System Design (AASPSD). AASPSD is an Air Force funded contract performed by The Boeing Company. The aircraft selected for this study was a Mach 6 vehicle. The three AASPSD configurations studied were a conventional system having hydraulic

E. J. Woods; C. S. Rubertus; I. S. Mehdi

1990-01-01

238

Amateur Built Aircraft Reference Material. OSHKOSH 97.  

National Technical Information Service (NTIS)

Contents: AC 20-27D, Certification and Operation of Amateur-Built Aircraft; AC 21-12A, Application for U.S. Airworthiness Certificate, FAA Form 8130-6; AC 65-23A, Certification of Repairman (Experimental Aircraft Builders); Memorandum, Revised Listing of ...

1997-01-01

239

Development of an Experimental Aircraft Hygrometer.  

National Technical Information Service (NTIS)

Two experimental aircraft hygrometers using dry-ice heat sinks were designed and constructed, both units recorded frost points below -80C when flight tested at altitudes to 65,000 feet aboard a U-2 aircraft. A third hygrometer which requires no chemical h...

L. Koehler J. G. Ballinger

1967-01-01

240

Unmanned aircraft: the future in military aviation  

Microsoft Academic Search

Summary form only given. This paper discussed the emerging need for unmanned military aircraft, technical challenges for network centric operations, and levels of adaptive autonomy. It described Boeing's development of the revolutionary X-45A experimental aircraft. The X-45 Joint Unmanned Combat Air System (J-CAS) is developed for the US Air Force and Navy at Boeing.

K. A. Wise

2004-01-01

241

Aircraft landing control based on adaptive CMAC  

Microsoft Academic Search

This paper presents an intelligent control scheme that uses an adaptive cerebellar model articulation controller (CMAC) in aircraft automatic landing system. The proposed intelligent controller can act as an experienced pilot and guide the aircraft to a safe landing in severe turbulence environment. Current flight control law is adopted in the intelligent design. Lyapunov theory is applied to obtain adaptive

Teng-Chieh Yang; Jih-Gau Juang

2009-01-01

242

Standardization of Gustiness Values from Aircraft  

Microsoft Academic Search

A universal turbulence standardization technique is described which is based quantitatively on the atmospheric turbulence itself rather than on the effects it products on an aircraft. It provides a single turbulence intensity number which may be measured continuously in flight in a variety of ways, and, with knowledge of the aircraft type and speed, can be linearly related to the

Paul B. Maccready Jr.

1964-01-01

243

Electromagnetic aircraft launch system development considerations  

Microsoft Academic Search

The US Navy is developing an electromagnetic aircraft launch system for its next generation of aircraft carriers. Its approach to the program is predicated on the state of the technology and expertise of the participants. A revised business model is discussed

R. R. Bushway

2001-01-01

244

Electromagnetic aircraft launch system-EMALS  

Microsoft Academic Search

With the proliferation of electromagnetic launch systems presently being designed, built, or studied, there appears to be no limit to their application. One of the intriguing applications is electromagnetically catapulting aircraft from the deck of an aircraft carrier. The US Navy had foreseen the substantial capabilities of an electromagnetic catapult in the 1940s and built a prototype. However, it was

Michael R. Doyle; Douglas J. Samuel; Thomas Conway; Robert R. Klimowski

1995-01-01

245

41 CFR 102-33.110 - What are our responsibilities when acquiring aircraft parts?  

Code of Federal Regulations, 2013 CFR

... What are our responsibilities when acquiring aircraft parts? 102-33.110 Section 102-33...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Acquiring Aircraft...

2013-01-01

246

41 CFR 102-33.315 - What are the procedures for mutilating unsalvageable aircraft parts?  

Code of Federal Regulations, 2013 CFR

...are the procedures for mutilating unsalvageable aircraft parts? 102-33.315 Section 102-33...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Disposing of Aircraft...

2013-01-01

247

41 CFR 102-33.225 - How must we manage aircraft parts?  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false How must we manage aircraft parts? 102-33.225 Section 102-33...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Managing Government Aircraft and Aircraft Parts Managing Aircraft Parts...

2013-01-01

248

41 CFR 102-33.310 - May we report as excess, or replace, unsalvageable aircraft parts?  

Code of Federal Regulations, 2013 CFR

...report as excess, or replace, unsalvageable aircraft parts? 102-33.310 Section 102-33...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Disposing of Aircraft...

2013-01-01

249

Unmanned aircraft systems as wingmen  

NASA Astrophysics Data System (ADS)

This paper introduces a concept towards integrating manned and Unmanned Aircraft Systems (UASs) into a highly functional team though the design and implementation of 3-D distributed formation/flight control algorithms with the goal to act as wingmen for a manned aircraft. This method is designed to minimize user input for team control, dynamically modify formations as required, utilize standard operating formations to reduce pilot resistance to integration, and support splinter groups for surveillance and/or as safeguards between potential threats and manned vehicles. The proposed work coordinates UAS members by utilizing artificial potential functions whose values are based on the state of the unmanned and manned assets including the desired formation, obstacles, task assignments, and perceived intentions. The overall unmanned team geometry is controlled using weighted potential fields. Individual UAS utilize fuzzy logic controllers for stability and navigation as well as a fuzzy reasoning engine for flight path intention prediction. Approaches are demonstrated in simulation using the commercial simulator X-Plane and controllers designed in Matlab/Simulink. Experiments include trail and right echelon formations as well as splinter group surveillance.

Garcia, Richard; Barnes, Laura; Fields, Maryanne

2010-04-01

250

Robotic sensors for aircraft paint stripping  

NASA Astrophysics Data System (ADS)

Aircraft of all types need to have paint routinely removed from their outer surfaces. Any method needs to be controlled to remove all the paint and not damage the surface of the aircraft. Human operators get bored with the monotonous task of stripping paint from an aircraft and thus do not control the process very well. This type of tedious operation tends itself to robotics. A robot that strips paint from aircraft needs to have feedback as to the state of the stripping process, its location in respect to the aircraft, and the availability of stripping material. This paper describes the sensors used on the paint stripping robot being developed for the United States Air Force's Manufacturing Technology Program. Particular attention is given to the paint sensor which is the feedback element for determining the state of the stripping process.

Weniger, Richard J.

1990-10-01

251

Turboprop aircraft against terrorism: a SWOT analysis of turboprop aircraft in CAS operations  

NASA Astrophysics Data System (ADS)

Today, the threat perception is changing. Not only for countries but also for defence organisations like NATO, new threat perception is pointing terrorism. Many countries' air forces become responsible of fighting against terorism or Counter-Insurgency (COIN) Operations. Different from conventional warfare, alternative weapon or weapon systems are required for such operatioins. In counter-terrorism operations modern fighter jets are used as well as helicopters, subsonic jets, Unmanned Aircraft Systems (UAS), turboprop aircraft, baloons and similar platforms. Succes and efficiency of the use of these platforms can be determined by evaluating the conditions, the threats and the area together. Obviously, each platform has advantages and disadvantages for different cases. In this research, examples of turboprop aircraft usage against terrorism and with a more general approach, turboprop aircraft for Close Air Support (CAS) missions from all around the world are reviewed. In this effort, a closer look is taken at the countries using turboprop aircraft in CAS missions while observing the fields these aircraft are used in, type of operations, specifications of the aircraft, cost and the maintenance factors. Thus, an idea about the convenience of using these aircraft in such operations can be obtained. A SWOT analysis of turboprop aircraft in CAS operations is performed. This study shows that turboprop aircraft are suitable to be used in counter-terrorism and COIN operations in low threat environment and is cost benefical compared to jets.

Yavuz, Murat; Akkas, Ali; Aslan, Yavuz

2012-05-01

252

14 CFR 21.21 - Issue of type certificate: normal, utility, acrobatic, commuter, and transport category aircraft...  

Code of Federal Regulations, 2013 CFR

...classes of aircraft; aircraft engines; propellers. 21.21 Section 21.21 Aeronautics...classes of aircraft; aircraft engines; propellers. An applicant is entitled to a...aircraft, or an aircraft engine or propeller, ifâ (a) The product...

2013-01-01

253

Combat aircraft noise: The operator's perspective  

NASA Astrophysics Data System (ADS)

Combat aircraft are not subject to the same noise reduction regulations as civil aircraft. Additionally, combat aircraft are operated closer to their performance limits and at high power settings for extended periods. There is general pressure to reduce noise of all kinds, but particularly noise from low flying aircraft. Although there is little that can be done to quiet in-service engines, operational palliatives, such as noise abatement procedures and restrictions on low flying, have been introduced. Moreover, there has been a concerted education and public relations campaign, and numerous airspace management changes have been introduced to reduce the impact of low flying on the population. These subjects were considered during a Pilot Study into aircraft noise under the auspices of the NATO Committee on the Challenges of Modern Society; the findings of the Study are discussed, giving both the international viewpoint and the UK perspective in particular. Some options for the reduction of low flying are also considered, but so long as military aircraft need to fly low to evade enemy air defences, low flying will remain a principal tactic of NATO air forces, and peacetime training will remain an essential military requirement. Thus, noise from low flying combat aircraft will remain a sensitive issue, and ways of reducing it will continue to be of importance for many years to come.

Bogg, R.

1992-04-01

254

Aircraft measurements of wave cloud  

NASA Astrophysics Data System (ADS)

In this paper, aircraft measurements are presented of liquid phase (ice-free) wave clouds made at temperatures greater than -5 °C that formed over Scotland, UK. The horizontal variations of the vertical velocity across wave clouds display a distinct pattern. The maximum updraughts occur at the upshear flanks of the clouds and the strong downdraughts at the downshear flanks. The cloud droplet concentrations were a couple of hundreds per cubic centimetres, and the drops generally had a mean diameter between 15-45 ?m. A small proportion of the drops were drizzle. A new definition of a mountain-wave cloud is given, based on the measurements presented here and previous studies. The results in this paper provide a case for future numerical simulation of wave cloud and the interaction between wave and clouds.

Cui, Z.; Blyth, A. M.; Bower, K. N.; Crosier, J.; Choularton, T.

2012-05-01

255

Aircraft measurements of wave clouds  

NASA Astrophysics Data System (ADS)

In this paper, aircraft measurements are presented of liquid phase (ice-free) wave clouds made at temperatures greater than -5°C that formed over Scotland, UK. The horizontal variations of the vertical velocity across wave clouds display a distinct pattern. The maximum updraughts occur at the upshear flanks of the clouds and the strong downdraughts at the downshear flanks. The cloud droplet concentrations were a couple of hundreds per cubic centimetres, and the drops generally had a mean diameter between 15-45 ?m. A small proportion of the drops were drizzle. The measurements presented here and in previous recent studies suggest a different interaction of dynamics and microphysics in wave clouds from the accepted model. The results in this paper provide a case for future numerical simulation of wave cloud and the interaction between wave and cloud.

Cui, Z.; Blyth, A. M.; Bower, K. N.; Crosier, J.; Choularton, T.

2012-10-01

256

Collision avoidance for aircraft in abort landing  

NASA Astrophysics Data System (ADS)

We study the collision avoidance between two aircraft flying in the same vertical plane: a host aircraft on a glide path and an intruder aircraft on a horizontal trajectory below that of the host aircraft and heading in the opposite direction. Assuming that the intruder aircraft is uncooperative, the host aircraft executes an optimal abort landing maneuver: it applies maximum thrust setting and maximum angle of attack lifting the flight path over the original path, thereby increasing the timewise minimum distance between the two aircraft and, in this way, avoiding the potential collision. In the presence of weak constraints on the aircraft and/or the environment, the angle of attack must be brought to the maximum value and kept there until the maximin point is reached. On the other hand, in the presence of strong constraints on the aircraft and the environment, desaturation of the angle of attack might have to take place before the maximin point is reached. This thesis includes four parts. In the first part, after an introduction and review of the available literature, we reformulate and solve the one-subarc Chebyshev maximin problem as a two-subarc Bolza-Pontryagin problem in which the avoidance and the recovery maneuvers are treated simultaneously. In the second part, we develop a guidance scheme (gamma guidance) capable of approximating the optimal trajectory in real time. In the third part, we present the algorithms employed to solve the one-subarc and two-subarc problems. In the fourth part, we decompose the two-subarc Bolza-Pontryagin problem into two one-subarc problems: the avoidance problem and the recovery problem, to be solved in sequence; remarkably, for problems where the ratio of total maneuver time to avoidance time is sufficiently large (?5), this simplified procedure predicts accurately the location of the maximin point as well as the maximin distance.

Mathwig, Jarret

257

World commercial aircraft accidents. Second edition, 1946--1992  

SciTech Connect

This report is a compilation of all accidents world-wide involving aircraft in commercial service which resulted in the loss of the airframe or one or more fatality, or both. This information has been gathered in order to present a complete inventory of commercial aircraft accidents. Events involving military action, sabotage, terrorist bombings, hijackings, suicides, and industrial ground accidents are included within this list. Included are: accidents involving world commercial jet aircraft, world commercial turboprop aircraft, world commercial pistonprop aircraft with four or more engines and world commercial pistonprop aircraft with two or three engines from 1946 to 1992. Each accident is presented with information in the following categories: date of the accident, airline and its flight numbers, type of flight, type of aircraft, aircraft registration number, construction number/manufacturers serial number, aircraft damage, accident flight phase, accident location, number of fatalities, number of occupants, cause, remarks, or description (brief) of the accident, and finally references used. The sixth chapter presents a summary of the world commercial aircraft accidents by major aircraft class (e.g. jet, turboprop, and pistonprop) and by flight phase. The seventh chapter presents several special studies including a list of world commercial aircraft accidents for all aircraft types with 100 or more fatalities in order of decreasing number of fatalities, a list of collision accidents involving commercial aircrafts, and a list of world commercial aircraft accidents for all aircraft types involving military action, sabotage, terrorist bombings, and hijackings.

Kimura, C.Y.

1993-01-01

258

Flight safety, aircraft vortex wake and airport operation capacity  

Microsoft Academic Search

One of the major problems that challenge today's aeronautics is the problem of improving flight safety. A zone of increased hazard is the aerospace in the vicinity of an airport. Here, one of aircraft accidents' causes is wake turbulence generated by aircraft. The encountering of an aircraft on take-off or landing with the vortex wake of a preceding aircraft can

Victor V. Vyshinsky

2001-01-01

259

Improvements in teaching aircraft engine design  

SciTech Connect

Aircraft gas turbine analysis and design pedagogy can be enriched through the incorporation improved preliminary engine thrust and fuel consumption models, novel computer programs for both aircraft system analysis and turbomechanical design, and a new perspective for engine-cycle analysis. Four computer programs have been developed for preliminary engine design; two of these automate aircraft system analysis, while another designs multistage axial-flow compressors and the last designs multistage axial-flow turbines. Student confusion with 'design-point' and 'off-design' concepts is by these means reduced. 6 refs.

Mattingly, J.D.; Heiser, W.H. (Seattle, University, WA (United States) Tennessee, University, Tullahoma (United States))

1992-07-01

260

Crack detection on HU-25 Guardian aircraft  

SciTech Connect

An ultrasonic inspection method was developed at FAA`s Airworthiness Assurance NDI Validation Center (AANC) to easily and rapidly detect hidden fatigue cracks in the copilot vertical windshield post on USCG (Coast Guard) HU-25 `Guardian` aircraft. The inspection procedure locates hidden cracks as small as 3.2 mm emanating from internal fastener holes and determines their length. A test procedure was developed and a baseline assessment of the USCG fleet conducted. Inspection results on 41 aircraft revealed good correlation with results made during subsequent structural disassembly and visual inspection of selected aircraft.

Moore, D.G.; Jones, C.R. [Sandia National Labs., Albuquerque, NM (United States); Mihelic, J.E.; Dassler, E.; Walizer, J. [Coast Guard, Elizabeth City, NC (United States). Aircraft Repair and Supply Center

1996-10-01

261

Improving the efficiency of smaller transport aircraft  

SciTech Connect

Considered apart from its propulsive system the high altitude airplane itself adapted to higher flight altitudes than those in current use. Scaling on the assumption of constant aircraft density indicates that this conclusion applies most importantly to smaller transport aircraft. Climb to 60,000 ft could save time and energy for trips as short as 500 miles. A discussion of the effect of winglets on aircraft efficiency is presented. A 10% reduction of induced drag below that of a comparable elliptic wing can be achieved either by horizontal or vertical wing tip extensions.

Jones, R.T.

1984-07-01

262

41 CFR 102-33.90 - What is the process for budgeting to acquire a Federal aircraft (including a Federal aircraft...  

Code of Federal Regulations, 2013 CFR

...the process for budgeting to acquire a Federal aircraft (including a Federal aircraft transferred from another executive agency...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and...

2013-01-01

263

Precise Aircraft-to-Aircraft Positioning Using a Multiple Receiver Configuration  

Microsoft Academic Search

A configuration of four IO-channel single frequency C\\/A code narrow correlator spacing receivers is used to position two aircraft with respect to each other. The platforms used are U.S. Navy P-3 Orion aircraft cruising at speeds of 300 knots. Two receivers are mounted on each aircraft, with one antenna mounted on the fuselage and the other some 20 m aft

G. Lachapelle; H. Sun; M. E. Cannon; G. Lu

1994-01-01

264

Aircraft engine emissions estimator. Final report, January 1983-September 1985  

SciTech Connect

The objective of this effort is to revise the Aircraft Emission Estimation Techniques (ACEE) Handbook to reflect changes in the Air Force aircraft inventory that have occurred since 1975. A complete listing of current Air Force aircraft and their associated engines is included. Emission factors for most of these engines are provided, along with examples for calculating emissions from aircraft operations, and analyzing their impact. This report supersedes CEEDO-TR-78-33, Aircraft Emission Estimation Techniques (ACEE).

Seitchek, G.D.

1985-11-01

265

Aerodynamic Interference Effects on Tilting Proprotor Aircraft.  

National Technical Information Service (NTIS)

The Green's function method was used to study tilting proprotor aircraft aerodynamics with particular application to the problem of the mutual interference of the wing-fuselage-tail-rotor wake configuration. While the formulation is valid for fully unstea...

P. Soohoo L. Morino R. B. Noll N. D. Ham

1977-01-01

266

Theoretical Analysis of Aircraft Electrostatic Discharge.  

National Technical Information Service (NTIS)

The general problem of aircraft electrostatic charging and one of the more efficient discharger systems presently available are discussed. Methods of discharger system design and analysis are developed and stated for this system. These methods are incorpo...

J. de la Cierva H. J. Gillis P. B. Wilson

1965-01-01

267

Digital Glass Cockpit for Commuter Aircraft.  

National Technical Information Service (NTIS)

The evolution of cockpit information systems is described and an outlook on future generation smaller and more cost and weight sensitive aircrafts is derived. Systems architecture and display formats are described. The A-310 and A-320 systems were address...

H. Kister

1989-01-01

268

Wireless Network Simulation in Aircraft Cabins.  

National Technical Information Service (NTIS)

An electromagnetic propagation prediction tool was used to predict electromagnetic field strength inside airplane cabins. A commercial software package, Wireless Insite, was used to predict power levels inside aircraft cabins and the data was compared wit...

M. Youssef L. Vahala J. H. Beggs

2004-01-01

269

Emerging nondestructive inspection methods for aging aircraft  

SciTech Connect

This report identifies and describes emerging nondestructive inspection (NDI) methods that can potentially be used to inspect commercial transport and commuter aircraft for structural damage. The nine categories of emerging NDI techniques are: acoustic emission, x-ray computed tomography, backscatter radiation, reverse geometry x-ray, advanced electromagnetics, including magnetooptic imaging and advanced eddy current techniques, coherent optics, advanced ultrasonics, advanced visual, and infrared thermography. The physical principles, generalized performance characteristics, and typical applications associated with each method are described. In addition, aircraft inspection applications are discussed along with the associated technical considerations. Finally, the status of each technique is presented, with a discussion on when it may be available for use in actual aircraft maintenance programs. It should be noted that this is a companion document to DOT/FAA/CT-91/5, Current Nondestructive Inspection Methods for Aging Aircraft.

Beattie, A.; Dahlke, L.; Gieske, J. [and others

1994-01-01

270

Military display market segment: aircraft cockpits  

NASA Astrophysics Data System (ADS)

The military display market is analyzed in terms of one of its segments, aircraft cockpits. Parameters that require special consideration, such as luminance ranges, light emission/viewing angles, and chromaticity coordinates, are examined.

Desjardins, Daniel D.; Hopper, Darrel G.

2001-09-01

271

Design of Aircraft Electric Power Supply Systems.  

National Technical Information Service (NTIS)

The report describes the possible variations of aircraft electric power systems. It discusses the merits and faults of types of current, generators, equipment, conductors, drives. Numerous circuit diagrams show how to avoid catastrophy in case of failure ...

G. D. Vlasov

1969-01-01

272

Consideration of Materials for Aircraft Brakes.  

National Technical Information Service (NTIS)

An exploratory investigation was conducted concerning materials and their properties for use in aircraft brakes. Primary consideration was given to the heat dissipation and the frictional behavior of materials. Used brake pads and rotors were analyzed as ...

M. B. Peterson T. Ho

1972-01-01

273

Aircraft Towing Feasibility Study. Final Report.  

National Technical Information Service (NTIS)

Energy costs and availability are major concerns in most parts of the world. Many ways of increasing energy supply and reducing consumption are being proposed and investigated. One that holds considerable promise is the extended towing of aircraft between...

1980-01-01

274

Treatment of Phenolic Aircraft Paint Stripping Wastewater.  

National Technical Information Service (NTIS)

A laboratory investigation was conducted to determine the optimum economic and technological treatment process to employ for treating large volumes of phenolic aircraft and ground equipment paint stripping wastewater. Three candidate unit processes were s...

R. H. Kroop

1973-01-01

275

Theoretical Fundamentals of the Aircraft GTE Tests.  

National Technical Information Service (NTIS)

We discuss the methodology of a new scientific theory taking as an example the aircraft gas turbine engine (GTE) tests. We formulate a theory of construction principles and practical approaches to the problem.

Y. V. Kozhevnikov

1993-01-01

276

Aircraft Flight Instrumentation Integrated Data Systems.  

National Technical Information Service (NTIS)

Contents: Requirements for aircraft integrated data systems--A survey of operational flight recording in the United Kingdom; Use of in-flight data recording for the air forces of Central Europe; Airline requirements regarding total system flexibility aids...

D. Bosman

1967-01-01

277

INVESTIGATION OF RADM PERFORMANCE USING AIRCRAFT MEASUREMENTS  

EPA Science Inventory

Measurements using specially instrumented aircraft were obtained during August and September, 1988 as an integral part of the ACID MODES (Model Operational and Diagnostic Evaluation Study) field study. pecialized flights, each designed to diagnose different aspects of the perform...

278

48 CFR 908.7102 - Aircraft.  

Code of Federal Regulations, 2011 CFR

... 908.7102 Section 908.7102 Federal Acquisition Regulations System DEPARTMENT OF ENERGY COMPETITION ACQUISITION PLANNING REQUIRED SOURCES OF SUPPLIES AND SERVICES Acquisition of Special Items 908.7102 Aircraft....

2011-10-01

279

48 CFR 908.7102 - Aircraft.  

Code of Federal Regulations, 2012 CFR

... 908.7102 Section 908.7102 Federal Acquisition Regulations System DEPARTMENT OF ENERGY COMPETITION ACQUISITION PLANNING REQUIRED SOURCES OF SUPPLIES AND SERVICES Acquisition of Special Items 908.7102 Aircraft....

2012-10-01

280

Foreign Technology Alert Bibliography: Aircraft Technology.  

National Technical Information Service (NTIS)

This document provides a systematically organised collection of abstracts from the NTIS bibliographic data base relating to fixed wing and rotary wing aircraft technology, but only describing work originating from countries outside the USA. A tailored sea...

G. Wilkinson

1982-01-01

281

Radiotracer Study of Turbine Aircraft Fuel Stability.  

National Technical Information Service (NTIS)

A radiotracer method was developed for detecting the contribution of selected components and additives to thermally induce deposits of turbine aircraft fuels. Fuels were examined before and after 52 weeks of storage at 130F. Of particular concern was the ...

C. C. Ward F. O. Cotton J. W. Goetzinger M. L. Whisman

1971-01-01

282

Study of Fretting Fatigue in Aircraft Components.  

National Technical Information Service (NTIS)

This thesis presents theoretical computational, and experimental approaches to the problem of fretting fatigue in materials systems relevant to aircraft components. The basic contact mechanics for fretting fatigue in a sphere-plane contact geometry are re...

P. R. Birch

1998-01-01

283

Intelligent Collaborative Aging Aircraft Parts Support.  

National Technical Information Service (NTIS)

Department of Defense (DoD) depot-level maintenance activities often experience delays in obtaining consumable repair and replacement parts for aging aircraft systems and components. As part of a concerted effort to reduce these delays, the Defense Logist...

D. A. Calderwood L. P. Forsley R. L. Jordan G. D. Williams

2002-01-01

284

Lateral attenuation of aircraft flight noise  

NASA Astrophysics Data System (ADS)

This report reviews models for calculating the lateral attenuation of aircraft flight noise, in particular, the change in attenuation for different elevation angles varying from aircraft directly overhead (90 deg. elevation angle) to a zero elevation angle. Sets of noise spectrum-dependent lateral attenuation values derived from theory and from experimental flight measurements were applied to sets of different aircraft noise spectra to determine A-level differences with elevation angle. The lateral attenuation based on the experimental data showed appreciably greater attenuation, but still less attenuation than the SAE model currently incorporated in the Integrated Noise Model (INM) aircraft noise computer program. Based on the experimental curves, a new generalized transition model was developed and is recommended as a replacement for current NOISEMAP lateral transition algorithm.

Bishop, D. E.

1985-03-01

285

Advisory Circular: Corrosion Control for Aircraft.  

National Technical Information Service (NTIS)

Identification and treatment of corrosive attack on aircraft structure and engine materials is presented. Corrosion inspection frequency, corrosion identification, and corrosion treatment continues to be the responsibility of the operator and should be ac...

1991-01-01

286

Adaptive Flight Control for Aircraft Safety Enhancements.  

National Technical Information Service (NTIS)

This poster presents the current adaptive control research being conducted at NASA ARC and LaRC in support of the Integrated Resilient Aircraft Control (IRAC) project. The technique 'Approximate Stability Margin Analysis of Hybrid Direct-Indirect Adaptive...

I. M. Gregory N. T. Nguyen S. M. Joshi

2008-01-01

287

Service Evaluation of Aircraft Experimental Fasteners.  

National Technical Information Service (NTIS)

An investigation was made of the degree of protection against corrosion provided to aircraft fasteners by high purity aluminum coatings versus the normal treatments - cadmium plating on steel and anodize on aluminum. Fasteners included aluminum and titani...

W. C. Herron

1967-01-01

288

Enroute Performance Assurance from User Aircraft Tracks.  

National Technical Information Service (NTIS)

A method of using the NAS Enroute Stage A equipment to assure enroute navigation facility alignment is described. Frequent and continued updating of the alignment is accomplished by this technique without the use of special aircraft or flights, distractio...

J. Lovell F. Perz

1973-01-01

289

Tribological Systems as Applied to Aircraft Engines.  

National Technical Information Service (NTIS)

Tribological systems as applied to aircraft are reviewed. The importance of understanding the fundamental concepts involved in such systems is discussed. Basic properties of materials which can be related to adhesion, friction and wear are presented and c...

D. H. Buckley

1985-01-01

290

Crashworthy Design of Aircraft Subfloor Structural Components.  

National Technical Information Service (NTIS)

Subfloor beams and bulkheads in aircraft structures are designed to carry longitudinal and shear loads resulting from fuselage bending and torsion. In crashes however, the subfloor is highly loaded in compression and shear. Especially the intersections of...

C. Kindervater H. Georgi U. Koerber

1988-01-01

291

C-20A Environmental Science Research Aircraft  

NASA Website

NASA's Dryden Flight Research Center operates a C-20A, a military version of the Gulfstream III business jet, as an environmental science research aircraft for a variety of geophysical research missions.

292

C-29A Aircraft Altimeter Errors.  

National Technical Information Service (NTIS)

This report documents the results of a study initiated to solve problems with pressure altimeter errors (differences between indicated and true altitude) aboard Air Force C-29A flight inspection aircraft. A basic review of altimetry is provided, along wit...

W. R. Schaub

1991-01-01

293

Tips for Travel and Aircraft Flight  

MedlinePLUS

Tips for Travel and Aircraft Flight Judith Casley-Smith, Ph.D. [We found the following information invaluable ... to travel, especially by air. Though Dr. Casley-Smith speaks primarily to the Australian population, these guidelines ...

294

Construction of One-Tenth Scale Model of the XFV-12A and Canard Performance Test.  

National Technical Information Service (NTIS)

The XFV-12A is a high performance, VTOL, fighter/attack aircraft which incorporates ejectors in the wings and canards for thrust augmentation. During transition from VTOL to normal flight, the interaction between downflow of the lifting jets and relative ...

J. E. Killian A. T. Doryland

1974-01-01

295

Aircraft Electric Power-Supply System  

Microsoft Academic Search

An ever increasing demand for electric power in aircraft has been felt for some time. The necessity of using an electric storage battery started the practice of accompanying it with a d-c generator, first of low current and voltage capacity, later of 50-ampere 12-volt rating, and for the past few years of 200-ampere 24-volt output. In the largest four-engine aircraft,

J. E. Yarmack

1943-01-01

296

Simulation of commercial-aircraft reliability  

Microsoft Academic Search

By applying Monte Carlo simulation methods, a simulation model is established which considers factors such as the reliability and maintainability (R&M) characteristics of the aircraft, weather conditions, management, flight dispatching, number of aircraft, route structure, maintenance level, personnel skills, spare parts supply, and so forth. The analysis results can provide the decision-making basis to improve a product's R&M for manufacturers

Weimin Yang; Yuan Zhu; Qingci Tu; Yixing Sheng

1991-01-01

297

Problems with aging wiring in Naval aircraft  

NASA Astrophysics Data System (ADS)

The Navy is experiencing a severe aircraft electrical wiring maintenance problem as a result of the extensive use of an aromatic polyimide insulation that is deteriorating at a rate that was unexpected when this wire was initially selected. This problem has significantly affected readiness, reliability, and safety and has greatly increased the cost of ownership of Naval aircraft. Failures in wire harnesses have exhibited arcing and burning that will propagate drastically, to the interruption of many electrical circuits from a fault initiated by the failure of deteriorating wires. There is an urgent need for a capability to schedule aircraft rewiring in an orderly manner with a logically derived determination of which aircraft have aged to the point of absolute necessity. Excessive maintenance was demonstrated to result from the accelerated aging due to the parameters of moisture, temperature, and strain that exist in the Naval Aircraft environment. Laboratory studies have demonstrated that MIL-W-81381 wire insulation when aged at high humidities followed the classical Arrhenius thermal aging relationship. In an extension of the project a multifactor formula was developed that is now capable of predicting life under varying conditions of these service parameters. An automated test system has also been developed to analyze the degree of deterioration that has occurred in wires taken from an aircraft in order to obtain an assessment of remaining life. Since it is both physically and financially impossible to replace the wiring in all the Navy's aircraft at once, this system will permit expedient scheduling so that those aircraft that are most probable to have wiring failure problems can be overhauled first.

Campbell, Frank J.

1994-09-01

298

Flight Safety Aircraft Risk: A Growing Problem  

NASA Astrophysics Data System (ADS)

In recent years there has been a growing awareness of the need to have appropriate criteria for protection of aircraft from debris resulting from the flight termination of a malfunctioning space booster. There have been several sequences of events that have interacted to bring us to the current risk management problem. With the advent of the US initiative to have common flight safety analysis processes and criteria, it was recognized that the traditional aircraft protection approach was inadequate. It did not consider the added public concern for catastrophic events. While the probability may have been small for downing a large commercial passenger plane, the public outrage if it happened would not be adequately measured by the individual risk to passengers nor the collective (societal risk) presented by a single airplane. Over a period of a number of years the US has developed and evolved a criterion to address catastrophic risk protection. Beginning in the same time period, it was recognized the assertion that all debris with masses greater than one gram were lethal to aircraft was unduly conservative. Over this same period initiatives have been developed to refine aircraft vulnerability models. There were, however, two significant unconservative assumptions that were made in the early years. It was presumed that significant risk to aircraft could only occur in the launch area. In addition, aircraft risk assessments, when they were made were based on debris lists designed to protect people on the ground (typically debris with an impact kinetic energy greater than 11 ft-lb). Good debris lists for aircraft protection do not yet exist. However, it has become increasingly clear that even with partial breakup lists large regions were required from which aircraft flight would be restricted using the normal exclusion approaches. We provide a review of these events and an indication of the way forward.

Haber, J. M.

2012-01-01

299

Structureborne noise control in advanced turboprop aircraft  

Microsoft Academic Search

Structureborne noise is discussed as a contributor to propeller aircraft interior noise levels that are nonresponsive to the application of a generous amount of cabin sidewall acoustic treatment. High structureborne noise levels may jeopardize passenger acceptance of the fuel-efficient high-speed propeller transport aircraft designed for cruise at Mach 0.65 to 0.85. These single-rotation tractor and counter-rotation tractor and pusher propulsion

Irvin J. Loeffler

1987-01-01

300

A Landing Radio Altimeter for Small Aircraft  

Microsoft Academic Search

An accurate radio altimeter with a dual-channel (quadrature) homodyne receiver is presented in this article. This new design improves the accuracy while operating in the standard 4.3 GHz radio-altimeter allocation. The new radio altimeter is intended as a landing aid for small general-aviation aircraft, experimental aircraft and UAVs and is equipped with a simple synthesized-voice human interface

M. Vidmar

2006-01-01

301

Distributed radar sensors for aircraft detection  

NASA Astrophysics Data System (ADS)

Radars suitable for aircraft detection could be deployed on singlet space-based interceptor (SBI) platforms. They could operate at short ranges and still achieve useful search rates. Powers are modest and insensitive to frequency; the dominant costs are the pulsers and phased-array elements. A fundamental simplification results from mounting the radar on the life jacket rather than the SBI. Many satellites could be processed to derive aircraft trajectories sufficiently accurate for the commitment of fighters or defensive missiles.

Canavan, G. H.

1991-04-01

302

Lateral attenuation of military aircraft flight noise  

NASA Astrophysics Data System (ADS)

The results are presented of measurements on the noise propagated to the side of military aircraft during a series of controlled level flyovers. Data were acquired on attack/fighter aircraft (A-10A, F4D, F-5E, F-15, F-16, and F-18); bomber aircraft (B-52G and FB-111); cargo/tanker aircraft (C-18, C-141, KC-10A, KC-135A, and KC-135R); and special purpose aircraft (C-21 and E-3A). In addition to the normal attenuation provided by wave divergence (spherical spreading) and atmospheric absorption, noise propagated laterally to the ground from aircraft during flight is further reduced by the combination of several other frequency dependent phenomena such as ground, meteorological, forward flight, and engine/airplane installation effects. Airbase/airport noise models typically define this extra lateral attenuation for single event measures such as the Sound Exposure Level as a function of the elevation angle as viewed from a given location on the ground. Based on the results of these data, a new algorithm was developed and incorporated in the Air Force NOISEMAP model.

Speakman, Jerry D.

1989-07-01

303

41 CFR 102-33.390 - What information must we report on Government aircraft?  

Code of Federal Regulations, 2013 CFR

...Continued) FEDERAL MANAGEMENT REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Reporting Information on Government Aircraft...report the following information to GSA, Aircraft Management Policy...

2013-01-01

304

14 CFR 135.338 - Qualifications: Flight instructors (aircraft) and flight instructors (simulator).  

Code of Federal Regulations, 2013 CFR

...Qualifications: Flight instructors (aircraft) and flight instructors (simulator...RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Training § 135.338 Qualifications: Flight instructors (aircraft) and flight instructors...

2013-01-01

305

14 CFR 65.104 - Repairman certificate-experimental aircraft builder-Eligibility, privileges and limitations.  

Code of Federal Regulations, 2013 CFR

... Repairman certificate-experimental aircraft builder-Eligibility, privileges... Repairman certificateâexperimental aircraft builderâEligibility...a repairman certificate (experimental aircraft builder), an individual...

2013-01-01

306

14 CFR 65.104 - Repairman certificate-experimental aircraft builder-Eligibility, privileges and limitations.  

Code of Federal Regulations, 2010 CFR

... Repairman certificate-experimental aircraft builder-Eligibility, privileges... Repairman certificateâexperimental aircraft builderâEligibility...a repairman certificate (experimental aircraft builder), an individual...

2009-01-01

307

14 CFR 65.104 - Repairman certificate-experimental aircraft builder-Eligibility, privileges and limitations.  

Code of Federal Regulations, 2010 CFR

... Repairman certificate-experimental aircraft builder-Eligibility, privileges... Repairman certificateâexperimental aircraft builderâEligibility...a repairman certificate (experimental aircraft builder), an individual...

2010-01-01

308

Beamforming for aircraft noise measurements  

NASA Astrophysics Data System (ADS)

Phased array beamforming for aircraft noise source location has a long history, including early work on jet noise, wind tunnel measurements, and flyover testing. In the last 10 years, advancements in sparse 2-D and 3-D arrays, wind tunnel test techniques, and computer power have made phased array measurements almost common. Large aerospace companies and national research institutes have an advantage in access to major facilities and hundreds of measurement microphones, but universities and even consulting companies can perform tests with electret microphones and PC data acquisition systems. The type of testing remains a blend of science and art. A complex noise source is approximated by a mathematical model, and the microphones are deployed to evaluate the parameters of the model. For example, the simplest, but often the best, approach is to assume a distribution of mutually incoherent monopoles. This leads to an imaging process analogous to photography. Other models include coherent distributions of multipoles or duct modes. It is sometimes important to simulate the results that would have been obtained from single microphone measurements of part of the airplane in an ideal environment, had such measurements been feasible.

Dougherty, Robert P.

2003-10-01

309

Safety of Aircraft Exposed to Electromagnetic Fields: HIRF Testing of Aircraft Using Direct Current Injection.  

National Technical Information Service (NTIS)

Even the original developers of Bulk Current Injection now make the point that the use of BCI at aircraft level will become increasingly difficult. Direct Current Injection has the potential to replace aircraft level BCI, while also solving many of the lo...

C. Leat

2007-01-01

310

78 FR 65554 - Exhaust Emission Standards for New Aircraft Turbine Engines and Identification Plate for Aircraft...  

Federal Register 2010, 2011, 2012, 2013

...45 [Docket No.: FAA-2012-1333; Amendment No. 34-5A] RIN 2120-AK15 Exhaust Emission Standards for New Aircraft Turbine Engines and Identification Plate for Aircraft Engines Correction In rule document 2013-24712, appearing on pages...

2013-11-01

311

Solar-Powered Aircraft: Cruciform wing allows aircraft to keep solar cells perpendicular to Sun.  

National Technical Information Service (NTIS)

This citation summarizes a one-page announcement of technology available for utilization. A proposed solar-powdered aircraft, driven by an electric motor, would have vertical and horizontal wings. This design would allow the aircraft to fly in a straight ...

1981-01-01

312

63 FR 20143 - Airworthiness Directives; All Models of The New Piper Aircraft, Inc. (Formerly Piper Aircraft...  

Federal Register 2010, 2011, 2012, 2013

...RIN 2120-AA64 Airworthiness Directives; All Models of The New Piper Aircraft, Inc...93-10-06, which currently applies to all models of The New Piper Aircraft, Inc...triplicate to the address specified above. All communications received on or before...

1998-04-23

313

Systematic analysis of aircraft separation requirements  

NASA Astrophysics Data System (ADS)

Minimum separation standards are necessary for safety in the air traffic control system. At the same time, minimum separation standards constrain the flow of air traffic and cause delays that translate to millions of dollars in fuel costs. Two necessary separation standards are defined. Then, practical methods for calculating the minimum required size of these separation standards are presented. First, the protected zone is considered. The protected zone represents a region around a given aircraft that no other aircraft should penetrate for the safety of both aircraft. It defines minimum separation requirements. Three major components of the protected zone and their interplays are identified: a vortex region, a safety buffer region, and a state-uncertainty region. A systematic procedure is devised for the analysis of the state-uncertainty region. In particular, models of trajectory controls are developed that can be used to represent different modes of pilot and/or autopilot controls, such as path feedback and non-path feedback. Composite protected zones under various conditions are estimated, and effective ways to reduce sizes of protected zones for advanced air traffic management are examined. In order to maintain minimum separation standards between two aircraft, proper avoidance maneuvers must be initiated before their relative separation reaches the minimum separation due to aircraft dynamics, controller and pilot response delays, etc. The concept of the required action threshold is presented. It is defined as the advanced time for which the conflict resolution process must begin in order to maintain minimum separation requirements. Five main segments in the process of conflict resolution are identified, discussed, and modeled: state information acquisition, comprehension and decision, communication, pilot response, and aircraft maneuver. Each of the five segments is modeled via a time constant. Time estimates for the first four segments are obtained from available literature. The aircraft maneuver time constant is evaluated through extensive simulation work, which considers the effects of the uncertainties involved in aircraft flight, different aircraft conflict geometries and the use of different control authorities in preventing the conflict. The models and simulation are then used to determine ranges in estimates for the required action threshold.

Ennis, Rachelle Lea

2005-12-01

314

Indoor air quality investigation on commercial aircraft.  

PubMed

Sixteen flights had been investigated for indoor air quality (IAQ) on Cathay Pacific aircraft from June 1996 to August 1997. In general, the air quality on Cathay Pacific aircraft was within relevant air quality standards because the average age of aircraft was less than 2 years. Carbon dioxide (CO2) levels on all flights measured were below the Federal Aviation Administration (FAA) standard (30,000 ppm). The CO2 level was substantially higher during boarding and de-boarding than cruise due to low fresh air supply. Humidity on the aircraft was low, especially for long-haul flights. Minimum humidity during cruise was below the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) minimum humidity standard (20%). The average temperature was within a comfortable temperature range of 23 +/- 2 degrees C. The vertical temperature profile on aircraft was uniform and below the International Standard Organization (ISO) standard. Carbon monoxide levels were below the FAA standard (50 ppm). Trace amount of ozone detected ranged from undetectable to 90 ppb, which was below the FAA standard. Particulate level was low for most non-smoking flights, but peaks were observed during boarding and de-boarding. The average particulate level in smoking flights (138 micrograms/m3) was higher than non-smoking flights (7.6 micrograms/m3). The impact on IAQ by switching from low-mode to high-mode ventilation showed a reduction in CO2 levels, temperature, and relative humidity. PMID:10439555

Lee, S C; Poon, C S; Li, X D; Luk, F

1999-09-01

315

Behavior of Very Large Aircraft Disturbed by Wind Shear and Atmospheric Turbulence.  

National Technical Information Service (NTIS)

The behavior of very large aircraft disturbed by wind shear and atmospheric turbulence (vertical gust during the landing approach) is analyzed by means of a multiloop system. The aircraft considered were a B-747-like aircraft and two hypothetical aircraft...

W. P. Deboer

1972-01-01

316

41 CFR 102-33.50 - Under what circumstances may we acquire Government aircraft?  

Code of Federal Regulations, 2013 CFR

...false Under what circumstances may we acquire Government aircraft? 102-33.50 Section 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Overview...

2013-01-01

317

41 CFR 102-33.45 - What is a Government aircraft?  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false What is a Government aircraft? 102-33.45 Section 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Overview...

2013-01-01

318

41 CFR 102-33.215 - May we use Government aircraft to carry passengers?  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false May we use Government aircraft to carry passengers? 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Managing Government Aircraft and Aircraft Parts Accounting...

2013-01-01

319

41 CFR 102-33.60 - What methods may we use to acquire Government aircraft?  

Code of Federal Regulations, 2013 CFR

... false What methods may we use to acquire Government aircraft? 102-33.60 Section 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Overview...

2013-01-01

320

41 CFR 102-33.55 - Are there restrictions on acquiring Government aircraft?  

Code of Federal Regulations, 2013 CFR

...false Are there restrictions on acquiring Government aircraft? 102-33.55 Section 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Overview...

2013-01-01

321

41 CFR 102-33.65 - What is the process for acquiring Government aircraft?  

Code of Federal Regulations, 2013 CFR

... false What is the process for acquiring Government aircraft? 102-33.65 Section 102-33...REGULATION PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Overview...

2013-01-01

322

10 CFR 862.5 - Procedures for removal of downed aircraft.  

Code of Federal Regulations, 2013 CFR

...false Procedures for removal of downed aircraft. 862.5 Section 862.5 Energy DEPARTMENT OF ENERGY RESTRICTIONS ON AIRCRAFT LANDING AND AIR DELIVERY AT DEPARTMENT...5 Procedures for removal of downed aircraft. (a) An aircraft on or...

2013-01-01

323

41 CFR 102-33.200 - Must we periodically justify owning and operating Federal aircraft?  

Code of Federal Regulations, 2013 CFR

...periodically justify owning and operating Federal aircraft? 102-33.200 Section 102-33.200...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Managing Government Aircraft and Aircraft Parts Accounting for the...

2013-01-01

324

41 CFR 102-33.250 - May we report as excess, or replace, declassified aircraft?  

Code of Federal Regulations, 2013 CFR

...report as excess, or replace, declassified aircraft? 102-33.250 Section 102-33.250...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Overview §...

2013-01-01

325

14 CFR 47.37 - Aircraft last previously registered in a foreign country.  

Code of Federal Regulations, 2013 CFR

...Space 1 2013-01-01 2013-01-01 false Aircraft last previously registered in a foreign country...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Certificates of Aircraft...

2013-01-01

326

41 CFR 102-33.270 - What is the process for reporting an excess aircraft?  

Code of Federal Regulations, 2013 CFR

... What is the process for reporting an excess aircraft? 102-33.270 Section 102-33.270...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Reporting Excess...

2013-01-01

327

10 CFR 862.5 - Procedures for removal of downed aircraft.  

Code of Federal Regulations, 2010 CFR

...false Procedures for removal of downed aircraft. 862.5 Section 862.5 Energy DEPARTMENT OF ENERGY RESTRICTIONS ON AIRCRAFT LANDING AND AIR DELIVERY AT DEPARTMENT...5 Procedures for removal of downed aircraft. (a) An aircraft on or...

2010-01-01

328

14 CFR 47.35 - Aircraft last previously registered in the United States.  

Code of Federal Regulations, 2013 CFR

...Space 1 2013-01-01 2013-01-01 false Aircraft last previously registered in the United States...AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRCRAFT REGISTRATION Certificates of Aircraft...

2013-01-01

329

14 CFR 91.317 - Provisionally certificated civil aircraft: Operating limitations.  

Code of Federal Regulations, 2013 CFR

...aircraft or set forth in the provisional aircraft flight manual or other appropriate document...supplemental type certification of the aircraft, that person shall operate under the experimental aircraft limitations of § 21.191 of this...

2013-01-01

330

14 CFR 21.500 - Acceptance of aircraft engines and propellers.  

Code of Federal Regulations, 2013 CFR

...Acceptance of aircraft engines and propellers. 21.500 Section 21.500...Acceptance of Aircraft Engines, Propellers, and Articles for Import ...Acceptance of aircraft engines and propellers. An aircraft engine or...

2013-01-01

331

A path model of aircraft noise annoyance  

NASA Astrophysics Data System (ADS)

This paper describes the development and testing of a path model of aircraft noise annoyance by using noise and social survey data collected in the vicinity of Toronto International Airport. Path analysis is used to estimate the direct and indirect effects of seventeen independent variables on individual annoyance. The results show that the strongest direct effects are for speech interference, attitudes toward aircraft operations, sleep interruption and personal sensitivity to noise. The strongest indirect effects are for aircraft Leq(24) and sensitivity. Overall the model explains 41 percent of the variation in the annoyance reported by the 673 survey respondents. The findings both support and extend existing statements in the literature on the antecedents of annoyance.

Taylor, S. M.

1984-09-01

332

NASA Langley Research Center's Unmanned Aerial System Surrogate Research Aircraft.  

National Technical Information Service (NTIS)

Research is needed to determine what procedures, aircraft sensors and other systems will be required to allow Unmanned Aerial Systems (UAS) to safely operate with manned aircraft in the National Airspace System (NAS). The NASA Langley Research Center has ...

A. Jessup C. Joyce C. T. Howell F. Jones H. Verstynen J. Mielnik P. Sugden

2010-01-01

333

76 FR 45647 - Consensus Standards, Light-Sport Aircraft  

Federal Register 2010, 2011, 2012, 2013

...Aviation Administration Consensus Standards, Light-Sport Aircraft AGENCY: Federal Aviation Administration...consensus standards relating to the provisions of the Sport Pilot and Light-Sport Aircraft rule issued July 16, 2004, and...

2011-07-29

334

77 FR 24251 - Consensus Standards, Light-Sport Aircraft  

Federal Register 2010, 2011, 2012, 2013

...Aviation Administration Consensus Standards, Light-Sport Aircraft AGENCY: Federal Aviation Administration...consensus standards relating to the provisions of the Sport Pilot and Light-Sport Aircraft rule issued July 16, 2004, and...

2012-04-23

335

Inductive Learning Approaches for Improving Pilot Awareness of Aircraft Faults.  

National Technical Information Service (NTIS)

Neural network flight controllers are able to accommodate a variety of aircraft control surface faults without detectable degradation of aircraft handling qualities. Under some faults, however, the effective flight envelope is reduced; this can lead to un...

L. Spikovska D. L. Iverson S. Poll Pryor

2005-01-01

336

Human-Centered Aircraft Automation: A Concept and Guidelines.  

National Technical Information Service (NTIS)

Aircraft automation is examined and its effects on flight crews. Generic guidelines are proposed for the design and use of automation in transport aircraft, in the hope of stimulating increased and more effective dialogue among designers of automated cock...

C. E. Billings

1991-01-01

337

Collision Avoidance for Unmanned Aircraft: Proving the Safety Case.  

National Technical Information Service (NTIS)

Applications for Unmanned Aircraft Systems (UAS) abound from military and homeland security to commercial services. The ability to integrate unmanned and manned aircraft into the same civil airspace is a critical capability that will enable growth in the ...

A. Drumm A. Lacher A. Zeitlin J. Kuchar

2006-01-01

338

Three dimensional ultrasonic imaging: An aging aircraft nondestructive inspection tool.  

National Technical Information Service (NTIS)

Ultrasonic nondestructive evaluation is a valuable technique for finding defects in aircraft structures. It can detect unbonds, corrosion damage and cracks in various aircraft components. Ultrasonic nondestructive evaluation techniques interrogate materia...

G. H. Thomas S. Benson S. Crawford

1993-01-01

339

Biodegradability Investigation of a Nonphenolic Aircraft Paint Stripper.  

National Technical Information Service (NTIS)

Paint stripping of aircraft and ground equipment is conducted periodically for the prevention of intergranular corrosion of the metallic surfaces. Wastewater occurs when the viscous paint stripper is rinsed from the aircraft or ground equipment surface wi...

R. H. Kroop R. L. Jambor

1974-01-01

340

Conceptual Design of Single Turbofan Engine Powered Light Aircraft.  

National Technical Information Service (NTIS)

The conceptual design of a four place single turbofan engine powered light aircraft was accomplished utilizing contemporary light aircraft conventional design techniques as a means of evaluating the NASA-Ames General Aviation Synthesis Program (GASP) as a...

F. S. Snyder C. G. Voorhees A. M. Heinrich D. N. Baisden

1977-01-01

341

Instrumentation of Sampling Aircraft for Measurement of Launch Vehicle Effluents.  

National Technical Information Service (NTIS)

An aircraft was selected and instrumented to measure effluents emitted from large solid propellant rockets during launch activities. The considerations involved in aircraft selection, sampling probes, and instrumentation are discussed with respect to obta...

D. E. Wornom D. C. Woods M. E. Thomas R. W. Tyson

1977-01-01

342

Operational Measures of Aircraft Carrier Landing System Performance.  

National Technical Information Service (NTIS)

Measures of final landing approach performance during day and night aircraft carrier recovery are analyzed and interpreted. Approximately 1,800 recoveries were recorded for experienced and inexperienced pilots across four aircraft carriers, six different ...

C. A. Brictson A. P. Ciavarelli J. W. Wulfeck

1969-01-01

343

Fractal Aircraft Trajectories, Scaling Stratification, Nonclassical Turbulent Exponents  

Microsoft Academic Search

The dimension (D) of aircraft trajectories is fundamental in interpretating airborne data. To estimate D, we studied data from 18 trajectories of stratospheric aircraft flights 1600km long taken during a \\

S. Lovejoy; D. Schertzer; A. Tuck

2004-01-01

344

78 FR 54561 - Airworthiness Directives; Piper Aircraft, Inc. Airplanes  

Federal Register 2010, 2011, 2012, 2013

...Aviation Administration (FAA), DOT. ACTION...SUMMARY: The FAA is correcting an airworthiness...Aircraft, Inc. Models PA-31, PA-31-325, and...gary.wechsler@faa.gov. SUPPLEMENTARY...Aircraft, Inc. Models PA-31, PA-31-325,...

2013-09-05

345

Ultrasonic Measurement of Aircraft Strut Hydraulic Fluid Level.  

National Technical Information Service (NTIS)

An ultrasonic method is presented for non-intrusively measuring hydraulic fluid level in aircraft struts in the field quickly and easily without modifying the strut or aircraft. The technique interrogates the strut with ultrasonic waves generated and rece...

S. G. Allison

2002-01-01

346

Lightning Protection Measures for Aircraft Fuel Systems. Phase 1.  

National Technical Information Service (NTIS)

Lightning is receiving increased recognition as a possible hazard to aircraft and an intensive four month program, covered in this report, on Phase I, demonstrated the existence of possible ignition sources in a typical aircraft wing tank section as well ...

M. M. Newman J. D. Robb J. R. Stahmann

1964-01-01

347

77 FR 41937 - Airworthiness Directives; Cessna Aircraft Company Airplanes  

Federal Register 2010, 2011, 2012, 2013

...Christine Abraham, Aerospace Engineer, Electrical Systems and Avionics, ACE-119W, FAA, Wichita Aircraft Certification Office...Christine Abraham, Aerospace Engineer, Electrical Systems and Avionics, ACE- 119W, FAA, Wichita Aircraft Certification...

2012-07-17

348

77 FR 21420 - Airworthiness Directives; Cessna Aircraft Company Airplanes  

Federal Register 2010, 2011, 2012, 2013

...Nhien Hoang, Aerospace Engineer, Electrical Systems and Avionics Branch, ACE-119W, FAA, Wichita Aircraft Certification...contact Nhien Hoang, Aerospace Engineer, Electrical Systems and Avionics Branch, ACE- 119W, FAA, Wichita Aircraft...

2012-04-10

349

Aircraft Penetration of Clouds Generated by Nuclear Bursts.  

National Technical Information Service (NTIS)

Aircraft penetrating radioactive dust clouds are exposed to an environment which could prove to be mission crippling. The performances of the crew of the aircraft, the mission critical electronics equipment, and/or the engines could be degraded sufficient...

R. P. Patrick G. D. Arnett W. A. Yingling

1974-01-01

350

Jet Aircraft Emissions During Cruise: Present and Future.  

National Technical Information Service (NTIS)

Forecasts of engine exhaust emissions that may be practicably achievable for future commercial aircraft operating at high altitude cruise conditions are compared to cruise emission for present day aircraft. The forecasts are based on: (1) knowledge of emi...

J. S. Grobman

1975-01-01

351

Design-oriented aeroservoelastic optimization of strain-actuated aircraft  

Microsoft Academic Search

An integrated design-oriented aeroservoelastic optimization capability for strain-actuated aircraft is presented. This capability is called SMART and it encompasses a suite of computer applications created for conceptual and preliminary design of aircraft augmented with \\

Timothy W. Jackson

2005-01-01

352

Affordable MMW aircraft collision avoidance system  

NASA Astrophysics Data System (ADS)

Collision avoidance is of concern to all aircraft, requiring the detection and identification of hazardous terrain or obstacles in sufficient time for clearance maneuvers. The collision avoidance requirement is even more demanding for helicopters, as their unique capabilities result in extensive operations at low-altitude, near to terrain and other hazardous obstacles. TO augment the pilot's visual collision avoidance abilities, some aircraft are equipped with 'enhanced-vision' systems or terrain collision warning systems. Enhanced-vision systems are typically very large and costly systems that are not very covert and are also difficult to install in a helicopter. The display is typically raw images from infrared or radar sensors, and can require a high degree of pilot interpretation and attention. Terrain collision warning system that rely on stored terrain maps are often of low resolution and accuracy and do not represent hazards to the aircraft placed after map sampling. Such hazards could include aircraft parked on runway, man- made towers or buildings and hills. In this paper, a low cost dual-function scanning pencil-beam, millimeter-wave radar forward sensor is used to determine whether an aircraft's flight path is clear of obstructions. Due to the limited space and weight budget in helicopters, the system is a dual function system that is substituted in place of the existing radar altimeter. The system combines a 35 GHz forward looking obstacle avoidance radar and a 4.3 GHz radar altimeter. The forward looking 35 GHz 3D radar's returns are used to construct a terrain and obstruction database surrounding an aircraft, which is presented to the pilot as a synthetic perspective display. The 35 GHz forward looking radar and the associated display was evaluated in a joint NASA Honeywell flight test program in 1996. The tests were conducted on a NASA/Army test helicopter. The test program clearly demonstrated the systems potential usefulness for collision avoidance.

Almsted, Larry D.; Becker, Robert C.; Zelenka, Richard E.

1997-06-01

353

Adaptive position tracking of VTOL UAVs  

Microsoft Academic Search

An adaptive position tracking control scheme is proposed for vertical thrust propelled unmanned airborne vehicles (UAVs) in the presence of external disturbances. As an intermediary step, the system attitude is used to direct the thrust towards the position target. Instrumental in our control design, an extraction method allowing to obtain the desired attitude and thrust from the required force driving

Andrew Roberts; Abdelhamid Tayebi

2009-01-01

354

Liquid-hydrogen-fueled passenger aircraft  

SciTech Connect

This Chinese translation discusses the idea that passenger aircraft will eventually use liquid-hydrogen fuel. There is a large reserve of hydrogen and hydrogen poses no danger to the environment. Hydrogen has high calorific value, high specific heat, low density, and low temperature. Aircraft will have to have liquid fuel tanks to carry the hydrogen and will have to be partially redesigned. Lockheed and NASA have considered such designs. A problem remains in the planning--the high cost of large extraction of liquid hydrogen.

Not Available

1986-03-11

355

41 CFR 102-33.350 - Do we need approval from GSA to replace aircraft parts by exchange or sale?  

Code of Federal Regulations, 2013 CFR

...false Do we need approval from GSA to replace aircraft parts by exchange or sale? 102-33.350...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Replacing Aircraft...

2013-01-01

356

41 CFR 102-33.290 - What other disclaimers must we include in our exchange/sale agreements for aircraft?  

Code of Federal Regulations, 2013 CFR

...include in our exchange/sale agreements for aircraft? 102-33.290 Section 102-33.290...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Replacing Aircraft...

2013-01-01

357

41 CFR 102-33.360 - What is the process for selling or exchanging aircraft parts for replacement?  

Code of Federal Regulations, 2013 CFR

...What is the process for selling or exchanging aircraft parts for replacement? 102-33.360 Section...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Replacing Aircraft...

2013-01-01

358

41 CFR 102-33.115 - Are there special requirements for acquiring military Flight Safety Critical Aircraft Parts (FSCAP)?  

Code of Federal Regulations, 2013 CFR

...for acquiring military Flight Safety Critical Aircraft Parts (FSCAP)? 102-33.115 Section...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Acquiring Government Aircraft and Aircraft Parts Acquiring Aircraft...

2013-01-01

359

41 CFR 102-33.295 - May we exchange or sell an aircraft through reimbursable transfer to another executive agency?  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false May we exchange or sell an aircraft through reimbursable transfer to another executive...PERSONAL PROPERTY 33-MANAGEMENT OF GOVERNMENT AIRCRAFT Disposing of Government Aircraft and Aircraft Parts Replacing Aircraft...

2013-01-01

360

Global\\/local analysis of composite light aircraft crash landing  

Microsoft Academic Search

The objective of this paper is to present the implementation of so-called global\\/local approach to crash landing analysis of the light composite aircraft. The analyses and experimental verifications have been performed for PZL I-23 aircraft, designed jointly by Institute of Aviation and PZL Swidnik aircraft factory. Some criteria for designing the light composite aircraft, according to the “safe-crash” rule have

M Bossak; J Kaczkowski

2003-01-01

361

Neural Network Based Estimator for a Maneuvering Aircraft  

Microsoft Academic Search

Dynamically unstable aircraft and their supermaneuverability produce enormous complexities and tight constraints that existing control strategies cannot handle. Neural networks have emerged as a powerful means to deal with complex non-linear systems such as aircraft parameter identification during complex maneuvers. This paper addresses preliminary research conducted to train a neural network to predict aircraft aerodynamic coefficients, both singularly and simultaneously,

S. Feteih; G. Breckenridge

1993-01-01

362

Aircraft accident construction set: performance engineering applied to accident reconstruction  

Microsoft Academic Search

For some time aircraft accident investigation has been a reverse engineering procedure. Failure analysis has taken a strict engineering approach, disregarding many of the alternatives relating to cause. As aircraft become automated, many relating factors will need to be considered in order to build an accurate reconstruction of an accident. The Aircraft Accident Construction Set will provide the investigator with

James W. Blanchard

1992-01-01

363

Nondestructive evaluation of aircraft fuselage panels with electronic shearography  

Microsoft Academic Search

With the growing number of aging passenger aircraft in the fleet, improve nondestructive inspection (NDI) techniques are being investigated to insure the reliability of the fuselage structures of these aircraft. The Boeing Commercial Airplane Group is evaluating nondestructive testing techniques for detecting disbonds in aircraft structures. One of the techniques under evaluation is electronic shearography. This paper describes the disbond

Morteza Safai

1993-01-01

364

Visual Simulation of Aircraft Carrier Assistant Landing System  

Microsoft Academic Search

The complex landing aid system is one of the most important differences for an aircraft to land on aircraft carrier and airport. The main components of landing aid system include Fresnel Lens, remote laser centered indicator, runway lights. Taking a full-task military aircraft simulator for example, paper describes the system structure and key technology of simulation for the landing aid

Yongjun Qiao; Xiaoming Bai; Xiaofang Xie; Yongsheng Li

2008-01-01

365

Operational Measures of Aircraft Carrier Landing System Performance  

Microsoft Academic Search

Measures of final landing approach performance during day and night aircraft carrier recovery are analyzed and interpreted. Approximately 1,800 recoveries were recorded for experienced and inexperienced pilots across four aircraft carriers, six different types of jet aircraft, and various environmental conditions. The salient features of the findings are reviewed and evaluated for their operational implications, with special emphasis on night

Clyde A. Brictson; Anthony P. Ciavarelli; Joseph W. Wulfeck

1969-01-01

366

Pulsed thermographic inspection and application in commercial aircraft repair  

Microsoft Academic Search

Pulsed infrared thermographic inspection has proven to be a fast, accurate, reliable and cost effective NDE alternative to traditional ultrasonic NDE of commercial aircraft structures. Accurate damage assessment and verification of proper repair is of utmost importance to the commercial aircraft operator today. Pulsed infrared thermographic inspection can be utilized on a wide variety of aircraft structures with a high

Robert J. Ducar

1999-01-01

367

Dynamics of an aircraft-towed body during release  

Microsoft Academic Search

A study is presented of the dynamic characteristics of a towed body during release from an aircraft. The towed body's trajectory relative to the aircraft is the most important aspect of its motion. If the body swings too far, it may strike the towing aircraft. To simulate the trajectory, governing equations are derived and a numerical simulation is performed. The

Mark C. Doty

1992-01-01

368

Managing Complexity in Aircraft Design Using Design Structure Matrix  

Microsoft Academic Search

Modern aerospace systems have reached a level of complexity that requires systematic methods for their design. The development of products in aircraft industry involves numerous engineers from different disciplines working on independent components. Routine activities consume a significant part of aircraft development time. To be competitive, aircraft industry needs to manage complexity and readjust the ratio of innovative versus routine

B. Shekar; R. Venkataram; B. M. Satish

2011-01-01

369

A fuzzy logic controller for aircraft flight control  

Microsoft Academic Search

This paper describes a model of an autopilot controller based on fuzzy algorithms. The controller maneuvers an aircraft from level flight into a final-approach flight path and maintains the aircraft along the glide path until just before touchdown. To evaluate the performance and effectiveness of the model, the aircraft response to controller actions is simulated using flight simulation techniques. The

Lawrence I. Larkin

1984-01-01

370

Aircraft Water Vapor Measurements Utilizing an Aluminum Oxide Hygrometer  

Microsoft Academic Search

A hygrometer for water vapor measurements from an aircraft was developed. An aluminum oxide hygrometer mounted in an aircraft Rosemount air temperature scoop was flown on the NASA Convair 990 and on a USAF B-57 aircraft. Water vapor measurements from the Convair 990 were conducted up to 40,000 ft with penetration into the stratosphere. Good agreement was obtained with simultaneously

Ernest Hilsenrath

1974-01-01

371

Aircraft Characterization in Icing Using Flight Test Data  

Microsoft Academic Search

The University of Illinois, in conjunction with NASA Glenn, has conducted a flight test program to investigate aircraft icing effects and develop aircraft icing effects characterization techniques. Flights were conducted in 2001 and 2002 to collect data in clear air as well as in natural icing conditions. These data were used to identify the effects of icing on aircraft performance

Edward A. Whalen; James W. Melody; Michael B. Bragg

2004-01-01

372

Hydrophobic coating study for anti-icing aircraft  

Microsoft Academic Search

Anti-icing or deicing of an aircraft is necessary for a safe flight operation. Mechanical processes, such as heating and deicer boot, are widely used. Deicing fluids, such as ethylene glycol type, are used to coat the aircraft. However, these should be coated every time before the take-off, since the fluids come off from the aircraft while cruising. We study a

Katsuaki Morita; Akihito Aoki; Akihisa Konno; Hirotaka Sakaue

2010-01-01

373

19 CFR 10.62b - Aircraft turbine fuel.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Aircraft turbine fuel. 10.62b Section 10.62b...Equipment for Vessels § 10.62b Aircraft turbine fuel. (a) General. Unless otherwise provided, aircraft turbine fuel withdrawn from a Customs...

2013-04-01

374

Operator directed common conceptual models for advanced aircraft automation  

Microsoft Academic Search

The incorporation of advanced flight automation systems into modern aircraft has resulted in an increase in errors in interaction with aircraft automation. A prior study identified the lack of a simple, consistent model of the automation as a contributing component and found pilots creating their own ad-hoc models of aircraft automation. The design of new, complex automation system requires a

Sanjay S. Vakil; R. John Hansman

1998-01-01

375

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions § 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2011-10-01

376

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions § 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2012-10-01

377

Experimental determination of visibility modeling parameters for aircraft  

Microsoft Academic Search

The Federal Aviation Administration (FAA) is presently engaged in research to quantify the visibility of aircraft under two important scenarios: aircraft observed directly by human operators in air traffic control towers (ATCT's), and aircraft observed by human operators through unmanned aerial vehicle (UAV) sensors viewed through ground-based display systems. Previously, an ATCT visibility analysis software tool (FAA Vis) was developed

Evelyn J. Boettcher; Tana Maurer; Steven R. Murrill; Brian Miller

2010-01-01

378

49 CFR 1562.23 - Aircraft operator and passenger requirements.  

Code of Federal Regulations, 2010 CFR

...TSA security threat assessment. (4) May, if...flightcrew member of an aircraft, as defined in 49 CFR...registration number of the aircraft. (iii) The flight...name-based security threat assessment for each passenger and...If TSA notifies the aircraft operator that a...

2010-10-01

379

Robust Gust Load Alleviation for a Flexible Aircraft  

Microsoft Academic Search

An ? controller design is presented to establish a nominal performance baseline for the vertical acceleration control of a B-52 aircraft model with flexibility. ?-synthesis and analysis is used to study the robust performance of the aircraft taking into account specific input and output multiplicative uncertainty models. The aircraft is assumed to be subjected to severe wind gusts causing undesirable

Nabil Aouf; Benoit Boulet; Ruxandra Botez

380

Research on hypersonic aircraft using pre-cooled turbojet engines  

Microsoft Academic Search

Systems analysis of a Mach 5 class hypersonic aircraft is performed. The aircraft can fly across the Pacific Ocean in two hours. A multidisciplinary optimization program for aerodynamics, structure, propulsion, and trajectory is used in the analysis. The result of each element model is improved using higher accuracy analysis tools. The aerodynamic performance of the hypersonic aircraft is examined through

Hideyuki Taguchi; Hiroaki Kobayashi; Takayuki Kojima; Atsushi Ueno; Shunsuke Imamura; Motoyuki Hongoh

381

Statistical Loads Data for Cessna 172 Aircraft Using the Aircraft Cumulative Fatigue System (ACFS).  

National Technical Information Service (NTIS)

The purpose of this research and development program was to manufacture a small, lightweight, low-cost recorder for loads usage monitoring of general aviation and commuter type aircraft to support the Federal Aviation Administration (FAA) Operation Loads ...

J. A. Cicero F. L. Feiter J. Mohammadi

2001-01-01

382

Flutter consideration of a crash-test aircraft. A review article on aircraft flutter.  

National Technical Information Service (NTIS)

The Plutonium Air Transport Certification (PATC) project is currently being conducted by the Nuclear Systems Safety Program (NSSP) for the US Nuclear Regulatory Commission. Developing aircraft crash test criteria is part of this effort. One objective is t...

T. F. Chen

1991-01-01

383

Supervisory task analysis: aircraft maintenance environment  

Microsoft Academic Search

A safe and reliable air transportation system is dependent upon a well designed and operated maintenance system. The linchpin of the maintenance system is the supervisor who is responsible for the maintenance, repair, and delivery of an airworthy aircraft. A task analysis of the supervisory function was conducted to obtain a better understanding of the requirements of this function. For

David C. Kraus; R. Saboda; A. K. Gramopadhye; T. N. Chandler

1997-01-01

384

Simulation model for aircraft line maintenance planning  

Microsoft Academic Search

This paper reports results of research that developed a computerized simulation model for the aircraft line maintenance department in Continental Airlines. The original AUTOMOD model that was created duplicated the maintenance operations at Continental's major maintenance station at Newark. Modeling the day-to-day maintenance activities lead to the development of enhanced staffing models and a better understanding of resource requirements on

P. Gupta; M. Bazargan; R. N. McGrath

2003-01-01

385

Commercial Aircraft Fuel Efficiency Potential Through 2010  

Microsoft Academic Search

Aircraft are second only to motor vehicles in the use of motor fuels, and air travel is growing twice as fast. Since 1970 air travel has more than tripled, but the growth of fuel use has been restrained by a near doubling of efficiency, from 26.2 seat miles per gallon (SMPG) in 1970 to about 49 SMPG in 1989. This

David L. Greene

1990-01-01

386

China's Growing Market for Large Civil Aircraft.  

National Technical Information Service (NTIS)

China will likely become the largest market in the world for new large civil aircraft (LCA), with global LCA manufacturers expecting to sell 100 LCA per year in the Chinese market for the next twenty years, or one every three to four days, at a total valu...

P. Anderson

2008-01-01

387

The performance of aircraft camera lenses  

Microsoft Academic Search

The estimation of the best combination of lens and film for aerial reconnaissance photography is not a simple problem, owing to the number of variables, such as focal length and aperture of the lens, the size and speed of the film, forward motion and speed of the aircraft which are involved. For quantitative considerations it is necessary to adopt a

E W H Selwyn; J L Tearle

1946-01-01

388

HTS motors in aircraft propulsion: design considerations  

Microsoft Academic Search

Current high temperature superconducting (HTS) wires exhibit high current densities enabling their use in electrical rotating machinery. The possibility of designing high power density superconducting motors operating at reasonable temperatures allows for new applications in mobile systems in which size and weight represent key design parameters. Thus, all-electric aircrafts represent a promising application for HTS motors. The design of such

Philippe J. Masson; Danielle S. Soban; Eric Upton; Jules E. Pienkos; Cesar A. Luongo

2005-01-01

389

Multilevel optimization in aircraft structural design evaluation  

Microsoft Academic Search

Changes of the structural design are one of the essentials in the investigation and optimization of alternative and innovative aircraft concepts. In this paper the choice of an appropriate design is seen as an optimization problem and solved by the application of a multilevel optimization procedure based on detailed Finite Element models of certain structural parts. The design is variable

Lars U. Hansen; Peter Horst

2008-01-01

390

Structural Risk Assessment and Aircraft Fleet Maintenance.  

National Technical Information Service (NTIS)

In the present analysis, deterministic flaw growth analysis is used to project the failure distributions from inspection data. Inspection data is reported for each critical point in the aircraft. The data will indicate either a crack of a specific size or...

H. Smith C. R. Saff T. F. Christian

1990-01-01

391

Escorting The Osprey: New Aircraft -- Same Regiment.  

National Technical Information Service (NTIS)

The V-22 Osprey, when flying in the airplane mode of flight, is too fast to be escorted by the AH-1W. Fixed wing escort aircraft cannot provide for close proximity, immediate threat suppression. The V-22, while operating at high airspeeds in the fixed win...

K. M. Sweaney

1996-01-01

392

Mechanical paint removal techniques for aircraft structures  

Microsoft Academic Search

Paint removal was studied by mechanical means, i.e., blasting, from aluminum structural aeronautical materials (2024-T3) and the changes on the surface morphology introduced by the paint removal process are examined. The principal experimental parameters are particle velocity, and particle angle of incidence. An ideal combination of these parameters could yield a stripped aircraft skin substrate with minimal or no damage.

J. P. Amro

1989-01-01

393

Service Life Investigation for Aging Aircraft.  

National Technical Information Service (NTIS)

This report results from a contract tasking TsAGI as follows: The contractor will report on investigation into structural issues effecting aging aircraft. One of the most important problems in aviation is the one of ensuring safe operation of aging aircra...

G. I. Nesterenko

1997-01-01

394

V-22 Osprey Tilt-Rotor Aircraft.  

National Technical Information Service (NTIS)

The V-22 Osprey is a tilt-rotor aircraft that takes off and lands vertically like a helicopter and flies like a plane by tilting its wing-mounted rotors to function as propellers. Combining a helicopter's operational flexibility with the greater speed, ra...

C. Bolkcom

2004-01-01

395

V-22 Osprey Tilt-Rotor Aircraft.  

National Technical Information Service (NTIS)

The V-22 Osprey is a tilt-rotor aircraft that takes off and lands vertically like a helicopter and flies like a plane by tilting its wing-mounted rotors to function as propellers. Combining a helicopter's operational flexibility with the greater speed, ra...

C. Bolkcom

2002-01-01

396

V-22 Osprey Tilt-Rotor Aircraft.  

National Technical Information Service (NTIS)

The V-22 Osprey is a tilt-rotor aircraft that takes off and lands vertically like a helicopter and flies like a plane by tilting its wing-mounted rotors to function as propellers. Combining a helicopter s operational flexibility with the greater speed, ra...

C. Bolkcom

2001-01-01

397

Pressure Modeling of Vertically Burning Aircraft Materials.  

National Technical Information Service (NTIS)

The possibility of evaluating relative rates of upward fire spread on aircraft cabin materials is investigated with small-scale models burned at elevated ambient air pressure. The modeling technique, which preserves the fluid Grashof number of the full-sc...

R. L. Alpert

1979-01-01

398

Aircraft fires, smoke toxicity, and survival.  

PubMed

In-flight fires in modern aircraft are rare, but post-crash fires do occur. Cabin occupants frequently survive initial forces of such crashes but are incapacitated from smoke inhalation. According to an international study, there were 95 fire-related civil passenger aircraft accidents worldwide over a 26-yr period, claiming approximately 2400 lives. Between 1985 and 1991, about 16% (32 accidents) of all U.S. transport aircraft accidents involved fire and 22% (140 fatalities) of the deaths in these accidents resulted from fire/smoke toxicity. Our laboratory analyses of postmortem blood samples (1967-93) indicate that 360 individuals in 134 fatal fire-related civil aircraft (air carrier and general aviation) accidents had carboxyhemoglobin saturation levels (> or = 20%), with or without blood cyanide, high enough to impair performance. Combustion toxicology is now moving from a descriptive to a mechanistic phase. Methods for gas analyses have been developed and combustion/animal-exposure assemblies have been constructed. Material/fire-retardant toxicity and interactions between smoke gases are being studied. Relationships between gas exposure concentrations, blood levels, and incapacitation onset are being established in animal models. Continuing basic research in smoke toxicity will be necessary to understand its complexities, and thus enhance aviation safety and fire survival chances. PMID:8775410

Chaturvedi, A K; Sanders, D C

1996-03-01

399

Modeling Lateral Attenuation of Aircraft Flight Noise.  

National Technical Information Service (NTIS)

Airbase and/or airport noise prediction models such as the Air Force NOISEMAP computer program are used to forecast the long term noise exposure from aircraft flight and ground activity at a facility. Noise contour maps from these calculations are used to...

B. F. Berry J. D. Speakman

1991-01-01

400

Instability and unsteadiness of aircraft wake vortices  

Microsoft Academic Search

This paper presents a review of theoretical and experimental results on stability and other unsteady properties of aircraft wakes. The basic mechanisms responsible for the propagation and the amplification of perturbation along vortices, namely the Kelvin waves and the cooperative instabilities, are first detailed. These two generic unsteady mechanisms are described by considering asymptotic linear stability analysis of model flows

L. Jacquin; D. Fabre; D. Sipp; H. Vollmers; Camille Soul

401

Infrared astronomical spectroscopy from high altitude aircraft  

Microsoft Academic Search

Two separate infrared astronomical observing programs are described which were carried out using telescopes mounted in aircraft flying above the tropopause. In the first program, the spectral reflectivity of the planet Mars was measured in the 2 micron to 4 micron wavelength region from the NASA Convair 990. The existence of a previously discovered broad and deep minimum in the

D. F. Schaack

1975-01-01

402

Effect of plume processes on aircraft impact  

Microsoft Academic Search

A versatile Gaussian plume model has been developed and used to investigate the chemistry in expanding aircraft plumes for a wide range of conditions, including the plume expansion rate, the composition of the background atmosphere, and the total time of the plume integration. The dependence of plume processing on altitude, latitude and season has been investigated in order to generate

P. F. Vohralik; L. K. Randeniya; I. C. Plumb; S. L. Baughcum

2008-01-01

403

Hydrogen fuel tanks for subsonic transport aircraft  

Microsoft Academic Search

Hydrogen is since long seen as an outstanding candidate for an environmentally acceptable, future aviation fuel. Since the first studies, the design of light yet highly insulated tanks for cryogenic liquid hydrogen has been identified as one of the key enabling technologies. Despite this early recognition, the design of the tanks is nowadays still seen as crucial as aircraft tanks

D. Verstraete; P. Hendrick; P. Pilidis; K. Ramsden

2010-01-01

404

Nonlinear dynamics of a vectored thrust aircraft  

Microsoft Academic Search

With realistic relations for the aerodynamic coefficients, numerical simulation is applied to study the longitudinal dynamics of a vectored thrust aircraft in the post-stall regime. As function of the thrust magnitude and the thrust vectoring angle the equilibrium state exhibits three Hopf bifurcations and two saddle-node bifurcations. Even when the equilibrium is stable, weakly damped oscillations occur with a period

Claus B. Sørensen; Erik Mosekilde; Péter Gránásy

1996-01-01

405

Coupled Oscillations of Aircraft Engine Propeller Systems  

Microsoft Academic Search

The coupled oscillations of a flexible propeller and an aircraft engine with arbitrary number of cranks is investigated. In the first part of this paper a practical method is developed to deter- mine the complete dynamical characteristics of a rotating vibrat- ing propeller of arbitrary shape, and the legitimacy of the ap- proximations is checked with a numerical example. In

MAURICE A. BIOT

406

Tactical aircraft optical cable plant program plan  

Microsoft Academic Search

A program was created with joint industry and government funding to apply fiber optic technologies to tactical aircraft. The technology offers many potential benefits, including increased electromagnetic interference immunity and the possibility of reduced weight, increased reliability, and enlarged capability from redesigning architectures to use the large bandwidth of fiber optics. Those benefits will only be realized if fiber optics

Thomas L. Weaver; John K. Murdock; James R. Ide

1995-01-01

407

Aircraft Environmental Systems Mechanic. Part 1.  

ERIC Educational Resources Information Center

This packet contains learning modules for a self-paced course in aircraft environmental systems mechanics that was developed for the Air Force. Each learning module consists of some or all of the following: objectives, instructions, equipment, procedures, information sheets, handouts, self-tests with answers, review section, tests, and response…

Chanute AFB Technical Training Center, IL.

408

NNICE - a neural network aircraft icing algorithm  

Microsoft Academic Search

Although much is known about the meteorological conditions for significant aircraft icing, research studies to date have only been successful identifying conditions for general icing, i.e. clouds in the temperature range from 0°C to about ?20°C. The aerodynamics of ice accumulation suggest three meteorological factors, cloud liquid water, droplet size, and air temperature. Only the latter is known or forecast

Donald W. Mccann

2005-01-01

409

Continuous Measurement of Aircraft Wing Icing.  

National Technical Information Service (NTIS)

Ice formation on the wings of aircraft is a problem that has plagued air travel since its inception. Several recent incidents have been attributed to ice formation on the lifting surfaces of wings. This paper describes a SBIR Phase 1 research effort on th...

S. S. C. Yao

1994-01-01

410

An aircraft noise study in Norway  

NASA Astrophysics Data System (ADS)

An extensive study of aircraft noise is currently being conducted in Oslo, Norway. The traffic at Oslo Airport Fornebu that includes both national and international flights, totals approximately 350 movements per day: 250 of these are regular scheduled flights with intermediate and large size aircraft, the bulk being DC9 and Boeing 737. The total traffic during the summer of 1989 was expected to resemble the maximum level to which the regular traffic will increase before the new airport can be put into operation. The situation therefore represented a possibility to study the noise impact on the communities around Fornebu. A comprehensive social survey was designed, including questions on both aircraft and road traffic noise. A random sample of 1650 respondents in 15 study areas were contacted for an interview. These areas represent different noise levels and different locations relative to the flight paths. The interviews were conducted in a 2 week period just prior to the transfer of charter traffic from Gardemoen to Fornebu. In the same period the aircraft noise was monitored in all 15 areas. In addition the airport is equipped with a permanent flight track and noise monitoring system. The noise situation both in the study period and on an average basis can therefore be accurately described. In August a group of 1800 new respondents were subjected to identical interviews in the same 15 areas, and the noise measurement program was repeated. Results of the study are discussed.

Gjestland, Truls T.; Liasjo, Kare H.; Bohn, Hans Einar

1990-04-01

411

Aircraft CO-Production and Procurement Strategy.  

National Technical Information Service (NTIS)

An analysis of the co-production in 1955-1964 of four U.S. military aircraft--the T-33A, P2V-7, F-86F, and F-104J--by Japanese firms. The process of transferring the required manufacturing technology is examined. For the F-104J the costs of transfer are a...

G. R. Hall R. E. Johnson

1967-01-01

412

Aircraft noise, hearing ability, and annoyance  

SciTech Connect

The relationship between aircraft noise, loss of hearing, and annoyance was explored in a study in two schools located near an international airport in Taiwan. Sixth-grade students (N = 242) were recruited from two schools and were classified into high-and low-noise-exposure groups, based on environmental noise measurements. Person-equivalent 24-h noise exposure was measured to determine noise exposure at the individual level, and it was compared with hearing threshold level and with aircraft noise measured at the environmental level. Individual hearing threshold levels did not differ between environmental high- and low-noise-exposure groups, as evidenced by the lack of difference between the two groups for noise exposure measured at the individual level. However, the proportion of students who were annoyed by aircraft noise was higher in the environmental high-noise-exposure group, although personal 24-h noise exposure was not a factor for annoyance. The results indicated that environmental noise measurement was not an appropriate criterion for assessment of auditory damage (or noise-induced hearing loss) in Taiwan. As well, aircraft-noise exposure in Taiwan did not appear to affect the hearing threshold but nonetheless annoyed school children near the airport. 21 refs., 3 tabs.

Wu, Trong-Neng [Department of Health, Taipei (Taiwan, Province of China); Jim Shoung Lai [Chinese Medical University, Taipei (Taiwan, Province of China); Chen-Yang Shen [Institute of Biomedical Sciences, Taipei (Taiwan, Province of China)] [and others

1995-11-01

413

AIRCRAFT REACTOR EXPERIMENT--METALLURGICAL ASPECTS  

Microsoft Academic Search

The selection of the proper structural material to be used in the ; construction of an Aircraft Reactcr is influenced by a number of important ; requirements. The material must have an acceptable cross section, be resistaant ; to elevated-temperatare corrosion by liquid metals, air, and the molten salts, ; and be free of temperature-gradient mass transfer. It must possess

W. D. Manly; G. M. Jr. Adamson; J. H. Coobs; J. H. DeVan; D. A. Douglas; E. E. Hoffman; P. Patriarca

1958-01-01

414

Automation tools for flexible aircraft maintenance.  

SciTech Connect

This report summarizes the accomplishments of the Laboratory Directed Research and Development (LDRD) project 26546 at Sandia, during the period FY01 through FY03. The project team visited four DoD depots that support extensive aircraft maintenance in order to understand critical needs for automation, and to identify maintenance processes for potential automation or integration opportunities. From the visits, the team identified technology needs and application issues, as well as non-technical drivers that influence the application of automation in depot maintenance of aircraft. Software tools for automation facility design analysis were developed, improved, extended, and integrated to encompass greater breadth for eventual application as a generalized design tool. The design tools for automated path planning and path generation have been enhanced to incorporate those complex robot systems with redundant joint configurations, which are likely candidate designs for a complex aircraft maintenance facility. A prototype force-controlled actively compliant end-effector was designed and developed based on a parallel kinematic mechanism design. This device was developed for demonstration of surface finishing, one of many in-contact operations performed during aircraft maintenance. This end-effector tool was positioned along the workpiece by a robot manipulator, programmed for operation by the automated planning tools integrated for this project. Together, the hardware and software tools demonstrate many of the technologies required for flexible automation in a maintenance facility.

Prentice, William J.; Drotning, William D.; Watterberg, Peter A.; Loucks, Clifford S.; Kozlowski, David M.

2003-11-01

415

Fixed Gain Controller Design for Aircraft.  

National Technical Information Service (NTIS)

A Method for designing fixed gain controllers and filters for systems with large parameter variation is presented. The approach, based of minmax information criteria, is used to design a non-adaptive back-up control system for a given aircraft and is show...

Y. Baram D. Eidelman

1981-01-01

416

Aircraft and background noise annoyance effects  

NASA Astrophysics Data System (ADS)

To investigate annoyance of multiple noise sources, two experiments were conducted. The first experiment, which used 48 subjects, was designed to establish annoyance-noise level functions for three community noise sources presented individually: jet aircraft flyovers, air conditioner, and traffic. The second experiment, which used 216 subjects, investigated the effects of background noise on aircraft annoyance as a function of noise level and spectrum shape; and the differences between overall, aircraft, and background noise annoyance. In both experiments, rated annoyance was the dependent measure. Results indicate that the slope of the linear relationship between annoyance and noise level for traffic is significantly different from that of flyover and air conditioner noise and that further research was justified to determine the influence of the two background noises on overall, aircraft, and background noise annoyance (e.g., experiment two). In experiment two, total noise exposure, signal-to-noise ratio, and background source type were found to have effects on all three types of annoyance. Thus, both signal-to-noise ratio, and the background source must be considered when trying to determine community response to combined noise sources.

Willshire, K. F.

1984-01-01

417

Aerodynamic Analysis of Hypersonic Waverider Aircraft.  

National Technical Information Service (NTIS)

The purpose of this study is to validate two existing codes used by the Systems Analysis Branch at NASA ARC, and to modify the codes so they can be used to generate and analyze waverider aircraft at on-design and off-design conditions. To generate waverid...

D. R. Sandlin D. N. Pessin

1993-01-01

418

Aircraft Environmental Systems Mechanic. Part 1.  

ERIC Educational Resources Information Center

|This packet contains learning modules for a self-paced course in aircraft environmental systems mechanics that was developed for the Air Force. Each learning module consists of some or all of the following: objectives, instructions, equipment, procedures, information sheets, handouts, self-tests with answers, review section, tests, and response…

Chanute AFB Technical Training Center, IL.

419

14 CFR 91.209 - Aircraft lights.  

Code of Federal Regulations, 2013 CFR

...sunrise (or, in Alaska, during the period a prominent unlighted object cannot be seen from a distance of 3 statute miles or the sun is more than 6 degrees below the horizon)â (1) Operate an aircraft unless it has lighted position lights; (2)...

2013-01-01

420

50 years of transonic aircraft design  

Microsoft Academic Search

This article traces the evolution of long range jet transport aircraft over the 50 years since Kuechemann founded the journal Progress in Aerospace Sciences. The article is particularly focused on transonic aerodynamics. During Kuechemann's life time a good qualitative understanding had been achieved of transonic flow and swept wing design, but transonic flow remained intractable to quantitative prediction. During the

Antony Jameson; Kui Ou

2011-01-01

421

Noise prediction technology for CTOL aircraft  

Microsoft Academic Search

The application of a new aircraft noise prediction program to CTOL noise prediction is outlined. Noise prediction is based on semiempirical methods for each of the propulsive system noise sources, such as the fan, the combustor, the turbine, and jet mixing, with noise-critical parameter values derived from the thermodynamic cycle of the engine. Comparisons of measured and predicted noise levels

J. P. Raney

1978-01-01

422

Experimental investigation on aircraft dynamic stability parameters  

Microsoft Academic Search

In this paper, the design requirements of an experimental apparatus for the measurement of the direct derivatives on an oscillating aircraft model in a wind tunnel are discussed. The elaboration of the signal output of the force transducer is analysed, according to the direct forced oscillation technique. The distorsions of the primary oscillatory motion were previously evaluated and corrected, adopting

Francesco Fusco; Giorgio Guglieri

1993-01-01

423

Detection of Corrosion in aircraft aluminum alloys  

Microsoft Academic Search

This work shows the application of an aqueous solution of gadolinium nitrate as a contrast agent in samples of AA7075 aluminum alloy used in aircraft structures for neutron radiography (NR) detection of corrosion as the pitting and exfoliation, either hidden or not, by the same alloy. Besides this, inspection for detection of simulated corrosions of several dimensions inside a cylindrical

Verginia R. Crispim; Jesse J. G. Da Silva

1998-01-01

424

Stratospheric aircraft: Impact on the stratosphere  

SciTech Connect

The steady-state distribution of natural stratospheric ozone is primarily maintained through production by ultraviolet photolysis of molecular oxygen, destruction by a catalytic cycle involving nitrogen oxides (NO{sub x}), and relocation by air motions within the stratosphere. Nitrogen oxides from the exhausts of a commercially viable fleet of supersonic transports would exceed the natural source of stratospheric nitrogen oxides if the t should be equipped with 1990 technology jet engines. This model-free comparison between a vital natural global ingredient and a proposed new industrial product shows that building a large fleet of passenger stratospheric aircraft poses a significant global problem. NASA and aircraft industries have recognized this problem and are studying the redesign of jet aircraft engines in order to reduce the nitrogen oxides emissions. In 1989 atmospheric models identified two other paths by which the ozone destroying effects of stratospheric aircraft might be reduced or eliminated: (1) Use relatively low supersonic Mach numbers and flight altitudes. For a given rate of nitrogen oxides injection into the stratosphere, the calculated reduction of total ozone is a strong function of altitude, and flight altitudes well below 20 kilometers give relatively low calculated ozone reductions. (2) Include heterogeneous chemistry in the two-dimensional model calculations. Necessary conditions for answering the question on the title above are to improve the quality of our understanding of the lower stratosphere and to broaden our knowledge of hetergeneous stratospheric chemistry. This article reviews recently proposed new mechanisms for heterogeneous reactions on the global stratospheric sulfate aerosols.

Johnston, H.

1992-02-01

425

Stratospheric aircraft: Impact on the stratosphere?  

SciTech Connect

The steady-state distribution of natural stratospheric ozone is primarily maintained through production by ultraviolet photolysis of molecular oxygen, destruction by a catalytic cycle involving nitrogen oxides (NO{sub x}), and relocation by air motions within the stratosphere. Nitrogen oxides from the exhausts of a commercially viable fleet of supersonic transports would exceed the natural source of stratospheric nitrogen oxides if the t should be equipped with 1990 technology jet engines. This model-free comparison between a vital natural global ingredient and a proposed new industrial product shows that building a large fleet of passenger stratospheric aircraft poses a significant global problem. NASA and aircraft industries have recognized this problem and are studying the redesign of jet aircraft engines in order to reduce the nitrogen oxides emissions. In 1989 atmospheric models identified two other paths by which the ozone destroying effects of stratospheric aircraft might be reduced or eliminated: (1) Use relatively low supersonic Mach numbers and flight altitudes. For a given rate of nitrogen oxides injection into the stratosphere, the calculated reduction of total ozone is a strong function of altitude, and flight altitudes well below 20 kilometers give relatively low calculated ozone reductions. (2) Include heterogeneous chemistry in the two-dimensional model calculations. Necessary conditions for answering the question on the title above are to improve the quality of our understanding of the lower stratosphere and to broaden our knowledge of hetergeneous stratospheric chemistry. This article reviews recently proposed new mechanisms for heterogeneous reactions on the global stratospheric sulfate aerosols.

Johnston, H.

1992-02-01

426

Aircraft landing control in wind shear condition  

Microsoft Academic Search

Most aircraft accidents occurred during final approach or landing. This study proposes cerebellar model articulation controller (CMAC) to improve the performance of automatic landing system (ALS). The atmospheric disturbances affect not only flying qualities of an airplane but also flight safety. If the flight conditions are beyond the preset envelope, the automatic landing system (ALS) is disabled and the pilot

Chia-Lin Lee; Jih-Gau Juang

2011-01-01

427

Geoacoustic inversions using sound from light aircraft  

NASA Astrophysics Data System (ADS)

A geoacoustic inversion technique using sound generated by propeller-driven light-aircraft has been developed for applications in underwater acoustics. In its simplest form, this method uses a single sensor in the ocean and the Doppler-shifted, narrow-band component of aircraft noise to determine the acoustic properties of marine sediments. In conjunction with this work, a wavenumber integration model and a normal-mode model have been developed for an airborne, constant speed, harmonic point-source in horizontal motion over a range-independent ocean, and are capable of computing the pressure field at any receiver location as a function of time. Acoustic measurements of a variety of aircraft have been made in both static and in-flight conditions and ocean experiments have been conducted using acoustic sensors in the air, water and buried in the sediment. Using the sensor in the air, estimates can be obtained of the aircraft speed, altitude, fundamental frequency and time at the closest point of approach. From a sensor in the water column or the sediment, estimates can be obtained of the sediment sound speed and attenuation. Data have been collected for an experimental site off the coast of La Jolla, California. The sound speed estimate of 1652.3 m/s and attenuation estimate of 0.40 dB/lambda using the 79 Hz harmonic of the engine are within the range of expected values for the fine to very-fine quartz sand sediment found in this area.

Giddens, Eric M.

428

Collection and Assessment of Aircraft Emissions.  

National Technical Information Service (NTIS)

Five engines each of four different models of aircraft piston engines were tested for gaseous emissions (NO, HC, and CO). All of the engines were new engines. In addition, two tests were performed to determine the effect of installing the sample probe in ...

J. F. Regueriro

1971-01-01

429

Aircraft viscous drag reduction using riblets  

Microsoft Academic Search

The last two decades have seen considerable research activity on the use of riblets for viscous drag reduction. Experimental results concerning the performance of 3M riblets on airfoils, wings and wing-body or aircraft configurations at different speed regimes are reviewed; these applications bring in additional effects like pressure gradients and three dimensionality. In addition to drag reduction, aspects of altered

P. R. Viswanath

2002-01-01

430

Smart aircraft fastener evaluation (SAFE) system: a condition-based corrosion detection system for aging aircraft  

Microsoft Academic Search

The smart aircraft fastener evaluation (SAFE) system is an advanced structural health monitoring effort to detect and characterize corrosion in hidden and inaccessible locations of aircraft structures. Hidden corrosion is the number one logistics problem for the U.S. Air Force, with an estimated maintenance cost of $700M per year in 1990 dollars. The SAFE system incorporates a solid-state electrochemical microsensor

Jeffrey N. Schoess; Greg Seifert; Clare A. Paul

1996-01-01

431

Computational fire modeling for aircraft fire research  

SciTech Connect

This report summarizes work performed by Sandia National Laboratories for the Federal Aviation Administration. The technical issues involved in fire modeling for aircraft fire research are identified, as well as computational fire tools for addressing those issues, and the research which is needed to advance those tools in order to address long-range needs. Fire field models are briefly reviewed, and the VULCAN model is selected for further evaluation. Calculations are performed with VULCAN to demonstrate its applicability to aircraft fire problems, and also to gain insight into the complex problem of fires involving aircraft. Simulations are conducted to investigate the influence of fire on an aircraft in a cross-wind. The interaction of the fuselage, wind, fire, and ground plane is investigated. Calculations are also performed utilizing a large eddy simulation (LES) capability to describe the large- scale turbulence instead of the more common k-{epsilon} turbulence model. Additional simulations are performed to investigate the static pressure and velocity distributions around a fuselage in a cross-wind, with and without fire. The results of these simulations provide qualitative insight into the complex interaction of a fuselage, fire, wind, and ground plane. Reasonable quantitative agreement is obtained in the few cases for which data or other modeling results exist Finally, VULCAN is used to quantify the impact of simplifying assumptions inherent in a risk assessment compatible fire model developed for open pool fire environments. The assumptions are seen to be of minor importance for the particular problem analyzed. This work demonstrates the utility of using a fire field model for assessing the limitations of simplified fire models. In conclusion, the application of computational fire modeling tools herein provides both qualitative and quantitative insights into the complex problem of aircraft in fires.

Nicolette, V.F.

1996-11-01

432

A Technique for Generating Arbitrarily Shaped Curved Approach Paths.  

National Technical Information Service (NTIS)

A technique for creating and using arbitrarily curved flight paths is described, in conjunction with either automatic or manual guidance. Operating techniques for VTOL aircraft in the terminal area environment are investigated. Straight lines and elliptic...

W. J. Mcconnell

1976-01-01

433

Design Methodology of a Hybrid Propulsion Driven Electric Powered Miniature Tailsitter Unmanned Aerial Vehicle  

Microsoft Academic Search

\\u000a Contrary to the manned tailsitter aircraft concepts, which have been shelved and forgotten after mid 1960’s, the unmanned\\u000a versions of these concepts have become popular. Since, tailsitter type UAVs combine both vertical takeoff and landing (VTOL)\\u000a operation and relatively high speed cruise flight capabilities which provide manifest advantages over the other VTOL aircraft\\u000a concepts, including helicopters and organic air vehicles

Mirac Aksugur; Gokhan Inalhan

434

Design Methodology of a Hybrid Propulsion Driven Electric Powered Miniature Tailsitter Unmanned Aerial Vehicle  

Microsoft Academic Search

Contrary to the manned tailsitter aircraft concepts, which have been shelved and forgotten after mid 1960’s, the unmanned\\u000a versions of these concepts have become popular. Since, tailsitter type UAVs combine both vertical takeoff and landing (VTOL)\\u000a operation and relatively high speed cruise flight capabilities which provide manifest advantages over the other VTOL aircraft\\u000a concepts, including helicopters and organic air vehicles

Mirac Aksugur; Gökhan Inalhan

2010-01-01

435

Psychiatric diagnoses aboard an aircraft carrier.  

PubMed

A descriptive study was conducted for 150 consecutive patients with a psychiatric diagnosis evaluated over 11 months by the medical staff onboard an aircraft carrier. Patients with sole diagnosis of alcohol abuse or dependence were excluded. Axis II diagnoses, or personality disorders, were more common (N = 120) than Axis I diagnoses (N = 46). The most common Axis I diagnoses were adjustment disorder and major depression. Axis II diagnoses were significantly more likely (OR = 7.33, 95% CI 4.45-12.16, p = 0.000) in sailors less than 23 years of age compared to ship's population. Suicide behavior was demonstrated in 68% (102/150) of the patient population. This study emphasized the requirement for extensive psychiatric training for the clinical aerospace medicine specialists providing operational support to aircraft carrier crews. PMID:1445152

Bohnker, B; McEwen, G; Blanco, J; Feeks, E

1992-11-01

436

Comprehensive analysis of transport aircraft flight performance  

Microsoft Academic Search

This paper reviews the state-of-the art in comprehensive performance codes for fixed-wing aircraft. The importance of system analysis in flight performance is discussed. The paper highlights the role of aerodynamics, propulsion, flight mechanics, aeroacoustics, flight operation, numerical optimisation, stochastic methods and numerical analysis. The latter discipline is used to investigate the sensitivities of the sub-systems to uncertainties in critical state

Antonio Filippone

2008-01-01

437

The ARCTAS aircraft mission: design and execution  

Microsoft Academic Search

The NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission was conducted in two 3-week deployments based in Alaska (April 2008) and western Canada (June-July 2008). The goal of ARCTAS was to better understand the factors driving current changes in Arctic atmospheric composition and climate, including (1) transport of mid-latitude pollution, (2) boreal forest

D. J. Jacob; J. H. Crawford; H. Maring; A. D. Clarke; J. E. Dibb; R. A. Ferrare; C. A. Hostetler; P. B. Russell; H. B. Singh; A. M. Thompson; G. E. Shaw; E. McCauley; J. R. Pederson; J. A. Fisher

2009-01-01

438

Corrosion of an aircraft radar antenna waveguide  

Microsoft Academic Search

Condensed moisture from ingressed humid air was responsible for inducing corrosion within the aft radar antenna from an RAAF P-3C Orion maritime surveillance aircraft. Porosity in the silver-plating of a flexible brass waveguide allowed moisture to penetrate to the brass substrate and cause dezincification. The moisture also induced corrosion of some of the AA-6061 aluminium alloy waveguides. An investigation determined

S. G Russo; M. J Henderson; B. R. W Hinton

2002-01-01

439

Agent-based scheduling for aircraft deicing  

Microsoft Academic Search

The planning and scheduling of the deicing and anti-icing activities is an important and challenging part of airport departure planning. Deicing planning has to be done in a highly dynamic environment involving several autonomous and self-interested parties. Traditional centralized scheduling approaches do not acknowledge the autonomy of parties involved. We therefore propose an agent-based scheduling approach for solving the aircraft

Xiaoyu Mao; A. W. Ter Mors; N. Roos; C. Witteveen

2006-01-01

440

Aircraft icing research flights in embedded convection  

Microsoft Academic Search

Summary  Results from in-cloud measurements with an instrumented aircraft from an icing research campaign in Southern Germany in March\\u000a 1997 are presented. Measurements with conventional optical cloud probes and of the ice accretion on a cylinder exposed to\\u000a the flow show the existence of supercooled large drops (SLD) in the size range up to 300?µm simultaneously with severe icing\\u000a with ice-accretion

T. Hauf; F. Schröder

2006-01-01

441

Interpretation of aircraft sea ice microwave data  

Microsoft Academic Search

This paper deals with the Bayesian classifier and its application for a radiometric discrimination of sea ice types. Microwave data used for these studies have been acquired from a dual-frequency passive nadir-looking radiometer which records radiation from earth at wavelengths of 1.6 and 3.2 cm. In addition, a photographic system and IR radiometer operating at8-14 mum were used in aircraft

V. Bogorodsky; A. Darovskih

1984-01-01

442

Aircraft Dynamics And Payload Interaction – SOFIA Telescope  

Microsoft Academic Search

\\u000a The Stratospheric Observatory for Infrared Astronomy (SOFIA) is now in operation out of NASA Dryden Flight Research Center\\u000a and is providing astronomical science observations not possible from other Earth- and spaceborne observatories. A 2.7 meter\\u000a telescope which weighs 34,000 pounds has been installed in the aft fuselage of a Boeing 747SP aircraft. This required significant\\u000a structural changes to the airframe.

Ralph Brillhart; Kevin Napolitano; Tracy Duvall

443

Fuel efficiency new dimension in aircraft design  

Microsoft Academic Search

A discussion covers the fact that optimum speed and size in terms of fuel consumption per passenger mile have already been reached in current aircraft; new fuel-efficient designs for the 1980's, including active control surfaces, which have the effect of increasing wingspan without redesigning the wing structure, mixed-flow nacelle designs, and use of lightweight composite materials; new designs for the

R. H. Hopps; R. E. Coykendall; L. E. Frisbee; J. K. Curry; A. E. Domke; S. E. Madsen

1977-01-01

444

Facial nerve palsy aboard a commercial aircraft.  

PubMed

Facial baroparesis is facial nerve palsy secondary to barotrauma. This phenomenon is frequently seen in divers, but is under-reported there and has rarely been described in aviators or passengers aboard commercial aircraft. We describe a 24-yr-old healthy aviator who experienced an episode of facial nerve palsy during ascent while traveling as a passenger aboard a commercial flight. The probable pathogenesis of this phenomenon in this case is described. PMID:15619863

Grossman, Alon; Ulanovski, David; Barenboim, Erez; Azaria, Bella; Goldstein, Liav

2004-12-01

445

Cryocooler for Air Liquefaction Onboard Large Aircraft  

Microsoft Academic Search

Creare has developed a turbo-Brayton cryocooler for the Air Force that is designed to produce approximately 1 kW of refrigeration at 95 K. The cryocooler is intended to provide cryogenic cooling for an air separation system being developed to produce and store liquid oxygen and liquid nitrogen onboard large aircraft. The oxygen will be used for high-altitude breathing and medical

J. J. Breedlove; P. J. Magari; G. W. Miller

2008-01-01

446

CRYOCOOLER FOR AIR LIQUEFACTION ONBOARD LARGE AIRCRAFT  

Microsoft Academic Search

Creare has developed a turbo-Brayton cryocooler for the Air Force that is designed to produce approximately 1 kW of refrigeration at 95 K. The cryocooler is intended to provide cryogenic cooling for an air separation system being developed to produce and store liquid oxygen and liquid nitrogen onboard large aircraft. The oxygen will be used for high-altitude breathing and medical

J. J. Breedlove; P. J. Magari; G. W. Miller

2008-01-01

447

The flight evaluation of aircraft antennas  

Microsoft Academic Search

Flight evaluation of communication-navigation-identification antennas installed on new types of aircraft is required to confirm model measurements. The paper reviews the parameters involved in such an evaluation under both standard and nonstandard propagation conditions. The predicted signal level across the receiver terminals connected to an isotropic antenna is employed as the standard of comparison with the scale-model antenna patterns. The

G. Leopard

1960-01-01

448

Prediction of anthropometric accommodation in aircraft cockpits  

NASA Astrophysics Data System (ADS)

Designing aircraft cockpits to accommodate the wide range of body sizes existing in the U.S. population has always been a difficult problem for Crewstation Engineers. The approach taken in the design of military aircraft has been to restrict the range of body sizes allowed into flight training, and then to develop standards and specifications to ensure that the majority of the pilots are accommodated. Accommodation in this instance is defined as the ability to: (1) Adequately see, reach, and actuate controls; (2) Have external visual fields so that the pilot can see to land, clear for other aircraft, and perform a wide variety of missions (ground support/attack or air to air combat); and (3) Finally, if problems arise, the pilot has to be able to escape safely. Each of these areas is directly affected by the body size of the pilot. Unfortunately, accommodation problems persist and may get worse. Currently the USAF is considering relaxing body size entrance requirements so that smaller and larger people could become pilots. This will make existing accommodation problems much worse. This dissertation describes a methodology for correcting this problem and demonstrates the method by predicting pilot fit and performance in the USAF T-38A aircraft based on anthropometric data. The methods described can be applied to a variety of design applications where fitting the human operator into a system is a major concern. A systematic approach is described which includes: defining the user population, setting functional requirements that operators must be able to perform, testing the ability of the user population to perform the functional requirements, and developing predictive equations for selecting future users of the system. Also described is a process for the development of new anthropometric design criteria and cockpit design methods that assure body size accommodation is improved in the future.

Zehner, Gregory Franklin

449

General aviation aircraft avionics: Integration & system tests  

Microsoft Academic Search

The avionics of current-day aircraft is termed as modular integrated full glass cockpit. Unlike lots of dials and gauges, the pilot will interact with Multi-Function Displays (MYD). This means that the systems are coupled with multi-function displays, communication and navigation radios with control units, multi-mode interactive instruments for control and navigation, recording and fault management systems, airframes and health monitoring

C. M. Ananda

2009-01-01

450

Sikorsky Aircraft Advanced Rotorcraft Transmission (ART) program  

Microsoft Academic Search

The objectives of the Advanced Rotorcraft Transmission program were to achieve a 25 percent weight reduction, a 10 dB noise reduction, and a 5,000 hour mean time between removals (MTBR). A three engine Army Cargo Aircraft (ACA) of 85,000 pounds gross weight was used as the baseline. Preliminary designs were conducted of split path and split torque transmissions to evaluate

Jules G. Kish

1993-01-01

451

R&M in conceptual aircraft design  

Microsoft Academic Search

Effectiveness of R&M (reliability and maintainability) in conceptual aircraft design is dependent on successful integration of R&M into the design process. The R&M process must not only integrate R&M tasks, but must also be integrated with other design and engineering functions. Once the process has been established, automation and tools required to support the process can be defined. An element

H. Sherrieb; J. T. Stracener

1992-01-01

452

GPS-BASED ATTITUDE FOR AIRCRAFT  

Microsoft Academic Search

GPS was used with ultra-short baselines (2-3 carrier wavelengths) in a triple antenna configuration to obtain aircraft atti- tude in real time. Through algorithm selection and error source calibration, accuracies of 0.1°, 0.15° and 0.2° rms were obtained for pitch roll and yaw respectively. The accuracy and robustness of the system was enhanced by combining the ultra short-baseline GPS attitude

Roger C. Hayward; Demoz Gebre-Egziabher; J. David Powell

453

Structural acoustic modeling of aircraft fuselage structures  

NASA Astrophysics Data System (ADS)

Recent studies at NASA Langley Research Center have examined the development and validation of finite element and boundary element modeling techniques for the prediction of structural acoustic response of aircraft fuselage structures. The goal of this work is to provide increased confidence in the modeling techniques so that interior noise criteria can be incorporated early in the design process. These efforts have focused on the development and validation of high-fidelity physics-based numerical models for structural acoustic predictions into the kilohertz region. Finite element models were developed based on the geometric and material properties of the aircraft fuselage structures. Experimental modal analysis and point force frequency response functions were used to validate and refine the finite element models. Once validated, the finite element predictions of the velocity response were used as boundary condition input for boundary element predictions of the radiated sound power. Experiments in the Structural Acoustic Loads and transmission (SALT) Facility at NASA Langley were used to validate the acoustic predictions. Numerical and experimental results will be presented for conventional aluminum rib and stringer-stiffened aircraft structures, a honey comb composite sidewall panel, and damped acrylic windows. Numerical predictions were in good agreement with the experimental data.

Buehrle, Ralph; Klos, Jacob; Robinson, Jay; Grosveld, Ferdinand

2002-11-01

454

Aircraft interior ANC with flat panel speakers  

NASA Astrophysics Data System (ADS)

In propeller driven aircraft the main source for internal noise are tonal disturbances caused by the propeller blades that are passing the fuselage. In a certain four propeller military transport aircraft the maximum sound level in the cabin can reach up to 110 dB(A), not taking into account any noise control treatments. Inside the semi closed loadmaster working station (LMWS) the sound level must be reduced down to 86 dB(A). It is proposed to reach this goal with an active noise control system, because passive solutions are to heavy at low frequencies. Optimal positions of the loudspeakers are found by finite element calculations. These positions have been realized in a full-scale test bed. A reduction of the sound pressure level of more than 30dB within a specified volume was achieved at a frequency of 100 Hz. HiFi speakers are used as secondary actuators in this test bed. These speakers are heavy and have unsuitable geometric dimensions for an aircraft. Therefore, other actuators, e.g. flat panel speakers, will be investigated with respect to the application in a mock-up of the LMWS.

Gerner, Christian; Sachau, Delf; Breitbach, Harald

2004-07-01

455

Altair Unmanned Aircraft System Achieves Demonstration Goals  

NASA Astrophysics Data System (ADS)

In the early morning of 15 November 2005, the unmanned Altair aircraft returned to Gray Butte Airfield, north of Los Angeles, Calif., after completing an 18.4-hour mission over the eastern Pacific Ocean. The flight was the last in a series undertaken by the U.S. National Oceanic and Atmospheric Administration (NOAA) in its Unmanned Aircraft System (UAS) Demonstration Project. The successful flight series has helped start the era of unmanned flights in service of environmental goals. Altair cruised at altitudes in the lower stratosphere (13 kilometers; ~43,000 feet), collecting atmospheric data with a 140-kilogram payload of both remote and in situ instruments. NOAA has recognized that UAS technology will improve its ability to meet scientific and operational objectives in the coming years. Operating sensor payloads on a UAS fleet could play a crucial role in the detection and attribution of climate change, improvement of weather predictions, management of water resources, monitoring and evaluation of ecosystems and sanctuaries, and atmospheric and oceanic research. UAS platforms have the potential to carry instrument payloads to remote locations in a manner that could not otherwise be achieved with conventionally piloted aircraft.

Fahey, David W.; Churnside, James H.; Elkins, James W.; Gasiewski, Albin J.; Rosenlof, Karen H.; Summers, Sara; Aslaksen, Michael; Jacobs, Todd A.; Sellars, Jon D.; Jennison, Christopher D.; Freudinger, Lawrence C.; Cooper, Michael

2006-05-01

456

De-Dopplerization of aircraft acoustic signals  

NASA Astrophysics Data System (ADS)

A de-Dopplerization scheme is devised and applied to both a tonal noise source, a XV-15 aircraft, and a broadband noise source, a F-18 aircraft. The procedure is developed from the conservation equations of fluid mechanics and is described in the paper. The corrected time history is constructed by using linear interpolation in the measured time history. This was made possible by knowing the position history of the aircraft provided by radar and/or laser tracking. The XV-15 data established that the scheme can accurately account for Doppler frequency shifts. The F-18 data confirms what has been noted in prediction models and static tests pertaining to broadband shock associated noise. That is, the peak frequency increases and the peaks broaden toward the jet axis. Another issue addressed in the study is the influence of correcting for spherical spreading and Doppler amplitude on the spectral shape and overall sound pressure levels of the source. Results from this investigation confirm that the dominant noise source in high-speed jets is due to turbulent mixing.

Kelly, Jeffrey J.; Wilson, Mark R.

1993-01-01

457

Aircraft noise and its nearfield propagation computations  

NASA Astrophysics Data System (ADS)

Noise generated by civil transport aircraft during take-off and approach-to-land phases of operation is an environmental problem. The aircraft noise problem is firstly reviewed in this article. The review is followed by a description and assessment of a number of sound propagation methods suitable for applications with a background mean flow field pertinent to aircraft noise. Of the three main areas of the noise problem, i.e. generation, propagation, and radiation, propagation provides a vital link between near-field noise generation and far-field radiation. Its accurate assessment ensures the overall validity of a prediction model. Of the various classes of propagation equations, linearised Euler equations are often casted in either time domain or frequency domain. The equations are often solved numerically by computational aeroacoustics techniques, bur are subject to the onset of Kelvin-Helmholtz (K-H) instability modes which may ruin the solutions. Other forms of linearised equations, e.g. acoustic perturbation equations have been proposed, with differing degrees of success.

Zhang, Xin

2012-08-01

458

Development of a biaxial test facility for structural evaluation of aircraft fuselage panels  

Microsoft Academic Search

The number of commercial airframes exceeding twenty years of service continues to grow. An unavoidable by-product of aircraft use is that crack and corrosion flaws develop throughout the aircraft`s skin and substructure elements. Economic barriers to the purchase of new aircraft have created an aging aircraft fleet and placed even greater demands on efficient and safe repair methods. Composite doublers,

D. Roach; P. Walkington; T. Rice

1998-01-01

459

Satellite surveillance of volcanic ash plumes, application to aircraft safety  

Microsoft Academic Search

The early phreatomagmatic and magmatic explosive activity of Redoubt Volcano, December 14-16, 1989, produced several ashladen eruption columns that caused significant damage to jet aircraft.The major aircraft-ash incident occurred December 15 at 1150 AST, when a KLM Boeing 747 jet aircraft, enroute from Amsterdam to Anchorage with 231 passengers and 14 crew members, flew through an ash plume east of

T. Kienle; K. G. Dean; H. Garbeil; W. I. Rose

1990-01-01

460

Applied Cognitive Ergonomics Design Principles for Fighter Aircraft  

Microsoft Academic Search

\\u000a The objective of the reported work was to study the use and applicability of applied cognitive ergonomics design principles\\u000a for fighter aircraft, with examples from the modern Swedish swing-role aircraft Gripen. Methods used were a literature review\\u000a of relevant design principles together with an analysis of their applicability to the fighter aircraft domain as well as interviews\\u000a of developers and

Jens Alfredson; Johan Holmberg; Rikard Andersson; Maria Wikforss

461

Design and control of a tri-rotor aircraft  

Microsoft Academic Search

In this paper, a tri-rotor aircraft is designed, which can vertically take off and land, and moreover fly forward with a high speed. Two fixed wings are added to the tri-rotor aircraft, therefore, the ability of high-speed forward flight is guaranteed. A controller is presented using back-stepping technique to achieve mode transition control of the aircraft. Finally, the theoretical result

Penghui Fan; Xinhua Wang; Kai-Yuan Cai

2010-01-01

462

MODULAR SOFT COMPUTING APPROACH FOR AIRCRAFT CARRIER LANDING TRAJECTORY PREDICTION  

Microsoft Academic Search

A modular learning design for classifying aircraft flight data in time-series prediction is proposed in this paper. This is part of the decision support system to assist landing signal officers in guiding aircraft to land on aircraft carriers. NeuroFuzzy systems are used to emulate the flight patterns for future real-time flight prediction. To improve the learning efficiency, a two stage

CHRIS TSENG; ARKADY EPSHTEYN

2009-01-01

463

Pulsed thermographic inspection and application in commercial aircraft repair  

NASA Astrophysics Data System (ADS)

Pulsed infrared thermographic inspection has proven to be a fast, accurate, reliable and cost effective NDE alternative to traditional ultrasonic NDE of commercial aircraft structures. Accurate damage assessment and verification of proper repair is of utmost importance to the commercial aircraft operator today. Pulsed infrared thermographic inspection can be utilized on a wide variety of aircraft structures with a high degree of accuracy. Acoustical structures that previously could not be scanned with traditional ultrasonic methods can be evaluated using pulsed infrared thermographic inspection.

Ducar, Robert J.

1999-03-01

464

Pulse Doppler signature of a rotary-wing aircraft  

Microsoft Academic Search

A measurement research program was conducted to investigate rotary-wing aircraft Doppler radar signature phenomenology. Results of the data analysis program are presented with regard to classification and identification of a rotary-wing aircraft based on its Doppler radar signature. Using the return from a Doppler radar and appropriate frequency-domain signal-processing techniques, a rotary-wing aircraft's design, such as main rotor configuration (single,

B. D. Bullard; P. C. Dowdy

1991-01-01

465

World commercial aircraft accidents: 1st edition, 1946--1991  

SciTech Connect

This report is a compilation of all accidents world-wide involving aircraft in commercial service which resulted in the loss of the airframe or one or more fatality, or both. This information has been gathered in order to present a complete inventory of commercial aircraft accidents. Events involving military action, sabotage, terrorist bombings, hijackings, suicides, and industrial ground accidents are included within this list. This report is organized into six chapters. The first chapter is the introduction. The second chapter contains the compilation of accidents involving world commercial jet aircraft from 1952 to 1991. The third chapter presents a compilation of accidents involving world commercial turboprop aircraft from 1952 to 1991. The fourth chapter presents a compilation of accidents involving world commercial pistonprop aircraft with four or more engines from 1946 to 1991. Each accident compilation or database in chapters two, three and four is presented in chronological order. Each accident is presented with information the following categories: date of accident, airline or operator and its flight number (if known), type of flight, type of aircraft and model, aircraft registration number, construction number/manufacturers serial number, aircraft damage resulting from accident, accident flight phase, accident location, number of fatalities, number of occupants, references used to compile the information, and finally cause, remarks, or description (brief) of the accident. The fifth chapter presents a list of all commercial aircraft accidents for all aircraft types with 100 or more fatalities in order of decreasing number of fatalities. Chapter six presents the commercial aircraft accidents for all aircraft types by flight phase. Future editions of this report will have additional follow-on chapters which will present other studies still in preparation at the time this edition was being prepared.

Kimura, C.Y.

1992-02-01

466

Canadian low-gravity research using parabolic aircraft  

NASA Astrophysics Data System (ADS)

An active experimental program being implemented by Canada in microgravity, which relies heavily on the use of parabolic aircraft, is discussed. The advantages of zero-gravity aircraft include low cost and quick turnaround. These aircraft have demonstrated their value for prototyping experimental hardware developments planned for flight at other facilities, such as sounding rockets and Shuttle-based carriers which are supported by the Canadian Space Agency.

Campbell, Glen S.; Vezina, L.; Aitken, J. F.

1992-12-01

467

Aging Aircraft NDI Development and Demonstration Center (AANC): An overview  

SciTech Connect

A major center with emphasis on validation of nondestructive inspection techniques for aging aircraft, the Aging Aircraft NDI Development and Demonstration Center (AANC), has been funded by the FAA at Sandia National Laboratories. The Center has been assigned specific tasks in developing techniques for the nondestructive inspection of static engine parts, assessing inspection reliability (POD experiments), developing test beds for nondestructive inspection validation, maintaining a FAA library of characterized aircraft structural test specimens, and leasing a hangar to house a high flight cycle transport aircraft for use as a full scale test bed. 3 refs.

Walter, P.L.

1991-01-01

468

14 CFR Appendix A to Part 65 - Aircraft Dispatcher Courses  

Code of Federal Regulations, 2013 CFR

...Pressurization. (5) Ice and Rain protection. (6) Avionics, Communication, and Navigation. (7) Powerplants and...Aircraft. (i) Systems. (ii) Navigation instruments and avionics systems. (iii) Flight instruments. (iv)...

2013-01-01

469

77 FR 38463 - Issuance of Special Airworthiness Certificates for Light-Sport Category Aircraft  

Federal Register 2010, 2011, 2012, 2013

...Airworthiness Certificates for Light-Sport Category Aircraft AGENCY: Federal Aviation...upon its assessment of the special light-sport aircraft (SLSA) manufacturing industry...and Airmen for the Operation of Light-Sport Aircraft, was published in the...

2012-06-28

470

76 FR 5 - Feathering Propeller Systems for Light-Sport Aircraft Powered Gliders  

Federal Register 2010, 2011, 2012, 2013

...Feathering Propeller Systems for Light-Sport Aircraft Powered Gliders AGENCY: Federal...comments amends the definition of light-sport aircraft by removing ``auto'' from...powered gliders that qualify as light-sport aircraft. DATES: This rule becomes...

2011-01-03

471

41 CFR 102-33.430 - Who must report Federal aircraft cost and utilization data?  

Code of Federal Regulations, 2013 CFR

...Federal aircraft cost and utilization data? 102-33.430 Section 102-33...Federal Aircraft Cost and Utilization Data § 102-33.430 Who must report Federal aircraft cost and utilization data? Executive agencies, except...

2013-01-01

472

14 CFR 206.5 - Small aircraft operations by certificated carriers.  

Code of Federal Regulations, 2013 CFR

... false Small aircraft operations by certificated carriers. 206.5 Section...206.5 Small aircraft operations by certificated carriers. (a) A carrier...operations with small aircraft only (a certificated carrier conducting...

2013-01-01

473

14 CFR 135.338 - Qualifications: Flight instructors (aircraft) and flight instructors (simulator).  

Code of Federal Regulations, 2010 CFR

...Qualifications: Flight instructors (aircraft) and flight instructors...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Training § 135.338 ...Qualifications: Flight instructors (aircraft) and flight...

2009-01-01

474

14 CFR 135.335 - Approval of aircraft simulators and other training devices.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Approval of aircraft simulators and other training...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Training § 135.335 Approval of aircraft simulators and other...

2013-01-01

475

14 CFR 137.55 - Business name: Commercial agricultural aircraft operator.  

Code of Federal Regulations, 2013 CFR

...name: Commercial agricultural aircraft operator. 137.55 Section...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...AND OPERATIONS AGRICULTURAL AIRCRAFT OPERATIONS Operating Rules...name: Commercial agricultural aircraft operator. No person...

2013-01-01

476

14 CFR 135.443 - Airworthiness release or aircraft maintenance log entry.  

Code of Federal Regulations, 2013 CFR

... Airworthiness release or aircraft maintenance log entry. 135...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Maintenance, Preventive... Airworthiness release or aircraft maintenance log entry....

2013-01-01

477

14 CFR 137.35 - Limitations on private agricultural aircraft operator.  

Code of Federal Regulations, 2013 CFR

...Limitations on private agricultural aircraft operator. 137.35 Section...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...AND OPERATIONS AGRICULTURAL AIRCRAFT OPERATIONS Operating Rules...Limitations on private agricultural aircraft operator. No person...

2013-01-01

478

14 CFR 375.36 - Lease of foreign civil aircraft without crew.  

Code of Federal Regulations, 2013 CFR

...REGULATIONS NAVIGATION OF FOREIGN CIVIL AIRCRAFT WITHIN THE UNITED STATES Authorized...375.36 Lease of foreign civil aircraft without crew. Foreign civil aircraft that are leased without crew to an air carrier or citizen or permanent...

2013-01-01

479

14 CFR 135.97 - Aircraft and facilities for recent flight experience.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Aircraft and facilities for recent...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Flight Operations § 135.97 Aircraft and facilities for...

2013-01-01

480

14 CFR 382.71 - What other aircraft accessibility requirements apply to carriers?  

Code of Federal Regulations, 2010 CFR

...false What other aircraft accessibility requirements apply to carriers? 382.71 ...71 What other aircraft accessibility requirements apply to carriers? (a) As a carrier, you must maintain all aircraft...

2010-01-01

481

14 CFR 135.183 - Performance requirements: Land aircraft operated over water.  

Code of Federal Regulations, 2013 CFR

...Performance requirements: Land aircraft operated over water. 135...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Aircraft and Equipment § 135.183...

2013-01-01

482

19 CFR 122.71 - Aircraft departing with no commercial export cargo.  

Code of Federal Regulations, 2013 CFR

... false Aircraft departing with no commercial export cargo. 122.71 Section...Members, and Non-Crew Members Onboard Commercial Aircraft Departing From the United States...122.71 Aircraft departing with no commercial export cargo. (a)...

2013-04-01

483

41 CFR 301-70.806 - What documentation must we retain for travel on Government aircraft?  

Code of Federal Regulations, 2012 CFR

...documentation must we retain for travel on Government aircraft? 301-70.806...Agencies That Authorize Travel on Government Aircraft § 301-70.806...must we retain for travel on Government aircraft? You must...

2012-07-01

484

47 CFR 80.379 - Maritime frequencies assignable to aircraft stations.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Maritime frequencies assignable to aircraft stations...SPECIAL RADIO SERVICES STATIONS IN THE MARITIME SERVICES Frequencies Aircraft Stations § 80.379 Maritime frequencies assignable to aircraft...

2012-10-01

485

14 CFR 65.107 - Repairman certificate (light-sport aircraft): Eligibility, privileges, and limits.  

Code of Federal Regulations, 2013 CFR

...false Repairman certificate (light-sport aircraft): Eligibility, privileges...107 Repairman certificate (light-sport aircraft): Eligibility, privileges...eligibility for a repairman certificate (light-sport aircraft) and appropriate rating:...

2013-01-01

486

Use of the Military Aircraft Storage and Disposition Center Could Be Improved.  

National Technical Information Service (NTIS)

The Military Aircraft Storage and Disposition Center is a source of aircraft and parts. By using the Center's resources when needed, the military services can avoid new procurements while maintaining aircraft readiness. But to fully obtain these benefits ...

1978-01-01

487

49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.  

Code of Federal Regulations, 2010 CFR

...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

2009-10-01

488

14 CFR 135.163 - Equipment requirements: Aircraft carrying passengers under IFR.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 false Equipment requirements: Aircraft carrying passengers under IFR. 135.163 Section...OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Aircraft and Equipment § 135.163 Equipment...

2013-01-01

489

14 CFR 21.24 - Issuance of type certificate: primary category aircraft.  

Code of Federal Regulations, 2013 CFR

...of type certificate: primary category aircraft. 21.24 Section 21.24 Aeronautics...ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT CERTIFICATION PROCEDURES FOR PRODUCTS...of type certificate: primary category aircraft. (a) The applicant is...

2013-01-01

490

14 CFR 91.715 - Special flight authorizations for foreign civil aircraft.  

Code of Federal Regulations, 2013 CFR

...flight authorizations for foreign civil aircraft. 91.715 Section 91.715 Aeronautics...OPERATING AND FLIGHT RULES Foreign Aircraft Operations and Operations of U.S.-Registered Civil Aircraft Outside of the United States; and...

2013-01-01

491

14 CFR 137.53 - Operation over congested areas: Pilots and aircraft.  

Code of Federal Regulations, 2013 CFR

...Operation over congested areas: Pilots and aircraft. 137.53 Section 137.53 Aeronautics...CERTIFICATION AND OPERATIONS AGRICULTURAL AIRCRAFT OPERATIONS Operating Rules § 137...Operation over congested areas: Pilots and aircraft. (a) General. No person may...

2013-01-01

492

49 CFR 175.310 - Transportation of flammable liquid fuel; aircraft only means of transportation.  

Code of Federal Regulations, 2010 CFR

...Transportation of flammable liquid fuel; aircraft only means of transportation. 175...HAZARDOUS MATERIALS REGULATIONS CARRIAGE BY AIRCRAFT Specific Regulations Applicable According...Transportation of flammable liquid fuel; aircraft only means of transportation....

2010-10-01

493

14 CFR 135.337 - Qualifications: Check airmen (aircraft) and check airmen (simulator).  

Code of Federal Regulations, 2013 CFR

...false Qualifications: Check airmen (aircraft) and check airmen (simulator...RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT Training § 135.337 Qualifications: Check airmen (aircraft) and check airmen (simulator)....

2013-01-01

494

14 CFR 91.711 - Special rules for foreign civil aircraft.  

Code of Federal Regulations, 2013 CFR

...false Special rules for foreign civil aircraft. 91.711 Section 91.711 Aeronautics...GENERAL OPERATING AND FLIGHT RULES Foreign Aircraft Operations and Operations of U.S.-Registered Civil Aircraft Outside of the United States; and...

2013-01-01

495

14 CFR 21.184 - Issue of special airworthiness certificates for primary category aircraft.  

Code of Federal Regulations, 2013 CFR

...airworthiness certificates for primary category aircraft. 21.184 Section 21.184 Aeronautics...ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT CERTIFICATION PROCEDURES FOR PRODUCTS...airworthiness certificates for primary category aircraft. (a) New primary category...

2013-01-01

496

14 CFR 65.63 - Aircraft dispatcher certification courses: Application, duration, and other general requirements.  

Code of Federal Regulations, 2013 CFR

... 2013-01-01 2013-01-01 false Aircraft dispatcher certification courses: Application...CERTIFICATION: AIRMEN OTHER THAN FLIGHT CREWMEMBERS Aircraft Dispatchers § 65.63 Aircraft dispatcher certification courses:...

2013-01-01

497

49 CFR 173.172 - Aircraft hydraulic power unit fuel tank.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 false Aircraft hydraulic power unit fuel tank...Relating to Transportation PIPELINE AND HAZARDOUS MATERIALS... § 173.172 Aircraft hydraulic power unit fuel tank. Aircraft hydraulic power unit fuel...

2009-10-01

498

49 CFR 173.172 - Aircraft hydraulic power unit fuel tank.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Aircraft hydraulic power unit fuel tank...Relating to Transportation PIPELINE AND HAZARDOUS MATERIALS... § 173.172 Aircraft hydraulic power unit fuel tank. Aircraft hydraulic power unit fuel...

2010-10-01

499

19 CFR 148.32 - Vehicles, aircraft, boats, teams and saddle horses taken abroad.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Vehicles, aircraft, boats, teams and saddle horses taken abroad...Residents § 148.32 Vehicles, aircraft, boats, teams and saddle horses taken abroad...Automobiles and other vehicles, aircraft, boats, teams and saddle horses,...

2013-04-01

500

14 CFR 91.319 - Aircraft having experimental certificates: Operating limitations.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Aircraft having experimental certificates: Operating...Operations § 91.319 Aircraft having experimental certificates: Operating...person may operate an aircraft issued an experimental certificate under §...

2013-01-01