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Jet transport energy management for minimum fuel consumption and noise impact in the terminal areaSignificant reductions in both noise and fuel consumption can be gained through careful tailoring of approach flightpath and airspeed profile, and the point at which the landing gear and flaps are lowered. For example, the noise problem has been successfully attacked in recent years with development of the 'two-segment' approach, which brings the aircraft in at a steeper angle initially, thereby achieving noise reduction through lower thrust settings and higher altitudes. A further reduction in noise and a significant reduction in fuel consumption can be achieved with the 'decelerating approach' concept. In this case, the approach is initiated at high airspeed and in a drag configuration that allows for low thrust. The landing flaps are then lowered at the appropriate time so that the airspeed slowly decelerates to V sub r at touchdown. The decelerating approach concept can be applied to constant glideslope flightpaths or segmented flightpaths such as the two-segment approach.
Document ID
19740055071
Document Type
Conference Paper
Authors
Bull, J. S.
Foster, J. D. (NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
August 1, 1974
Subject Category
AIRCRAFT
Report/Patent Number
AIAA PAPER 74-811
Meeting Information
Mechanics and Control of Flight Conference(Anaheim, CA)
Distribution Limits
Public
Copyright
Other