Landing gear

About: Landing gear is a research topic. Over the lifetime, 3403 publications have been published within this topic receiving 25370 citations. The topic is also known as: landing gear & gear.

Detachable skis for aircraft

Abstract: A wheel-through ski for the landing gear of an aircraft is disclosed. The ski has an airfoil shape, and the ski and its attachments are aerodynamically clean. The ski is provided with a three sided recess that permits the mounting of the ski on the aircraft without lifting the landing gear off the ground. The members of the articulated attachment between the ski and the aircraft are joined by a removable pin and are fixedly attached to the ski and landing gear. The ski is of aircraft construction. It has a thin skin, air frame-like internal structures, foam material internal cores that provide stiffness to the ski and wear strips on the bottom of the ski.

Aircraft ground maintenance tether assembly

Abstract: A highly visible tether assembly for use on parked aircraft that interconnects the pitot tube covers with the landing gear lock pin thereby assuring removal of both the covers and the lock pin as part of the aircraft preflight check list. The assembly is made of heat and environment resistant materials that avoid instrument and air craft damage during installation and residence.

Investigation of engine tones in flight

Abstract: Acoustic fly-over measurements with Boeing 747-400 aircraft have been performed in order to extend an existing noise data base for Airbus A319/20 and MD-11 aircraft with another widely used wide-body aircraft. The data were recorded with a large multi-arm spiral microphone array with 238 microphones which extended over an area of 42 by 35 m. The flight trajectories were determined using a combination of onboard flight recorder and GPS data and an array of laser distance meters on the ground. A linearised trajectory of the aircraft was determined for every fly-over in order to calculate frequency spectra for different emission angles at emission time by compensating the Doppler effect. Sound source maps were calculated using the standard beamforming algorithm and a deconvo- lution method for moving sources. Fly-over measurements were performed with different configurations in order to analyse airframe and engine noise sources separately. In this paper, the main focus is on the analysis of fly-overs with different engine speeds, but also, some results for landing gear noise are presented.