The flight path of an aircraft travelling at constant velocity and constant altitude is described by a set of five motion parameters which can be estimated using a ground-based wide aperture acoustic array. The narrowband motion parameter estimation method, based on the Doppler effect, requires the aircraft to emit an acoustic tone that is often absent in the case of a jet aircraft. The motion ...

1EPA 2Printed on paper that contains at least 30 percent postconsumer fiber. 1 This fact sheet focuses on contrails produced by aircraft engine exhaust. However, the term " contrail " is also used to refer to the short trails sometimes briefly appearing over aircraft wings or engine propellers, especially under mild, humid conditions. These contrails consist entirely of atmospheric water that c...

This study is motivated by the development of aircraft that use jet noise shielding by the airframe. Current methods to predict shielding from aircraft surfaces rely on formulae developed for diffraction of sound from omnidirectional point sources. However, the jet noise source is distributed and directional, thus requiring a different approach. In this study, the jet noise source is modeled as...

(2003). Cognitive task analysis of commercial jet aircraft pilots during instrument approaches for baseline and synthetic vision displays.

The dilution of jet engine exhaust in the plume behind cruising aircraft is determined from measured plume properties. The data set includes in situ measurements of CO 2 , NO, NO y , SO 2 , H 2 O, temperature, and contrail diameters behind subsonic and supersonic aircraft in the upper troposphere and lower stratosphere, for plume ages of seconds to hours. The set of data is extended into the ra...

Previous research indicates that pilots of most jet-fighter aircraft attend to similar elements of the natural flight environment when flying at low altitudes. However, some evidence suggests that differences may exist for pilots of certain specific types of aircraft. The present experiment examined the influence of operational factors on the perceived structure of real-world scenes viewed duri...

Trans World Airlines (TWA) flight 800 was only twelve minutes into a July 19, 1996 trip from New York to Paris when an in-flight explosion destroyed the passenger jet, plunging it into the Atlantic with 230 people on board. The aircraft was climbing south of the Long Island coast near East Moriches, New York when suddenly, portions of the Boeing 747-131 fuselage beneath the center wing fuel tan...

one of the major problems facing the aircraft industry is the machining of the engine parts. amongst the numerous parts in a jet engine are intricate parts made of special alloys for high temperature service, namely nickel,chromium and titanium alloys. these alloys are usually very difficult to machine, which creates problems in this respect. the necessity of quality control in each stage of pr...

We investigate whether there were common causes for the withdrawal from the regional aircraft market of three established manufacturers (BAE Systems, Fokker and Saab), while competitors thrived. We focus on the markets for 50and 100-seat aircraft. One cause concerning the 50-seat market was the introduction of a new class of aircraft, the regional jet, which pushed the less successful turboprop...

We investigate whether there are common causes for the withdrawal from the regional aircraft market of three established manufacturers (BAE Systems, Fokker and Saab), while competitors thrived. We focus on the markets for 50and 100-seat aircraft. One cause concerning the 50-seat market was the introduction of a new class of aircraft, the regional jet, which pushed the less successful turboprop ...