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Manual Throttles-Only Control Effectivity for Emergency Flight Control of Transport AircraftIf normal aircraft flight controls are lost, emergency flight control may be attempted using only the thrust of engines. Collective thrust is used to control flightpath, and differential thrust is used to control bank angle. One issue is whether a total loss of hydraulics (TLOH) leaves an airplane in a recoverable condition. Recoverability is a function of airspeed, altitude, flight phase, and configuration. If the airplane can be recovered, flight test and simulation results on several transport-class airplanes have shown that throttles-only control (TOC) is usually adequate to maintain up-and-away flight, but executing a safe landing is very difficult. There are favorable aircraft configurations, and also techniques that will improve recoverability and control and increase the chances of a survivable landing. The DHS and NASA have recently conducted a flight and simulator study to determine the effectivity of manual throttles-only control as a way to recover and safely land a range of transport airplanes. This paper discusses TLOH recoverability as a function of conditions, and TOC landability results for a range of transport airplanes, and some key techniques for flying with throttles and making a survivable landing. Airplanes evaluated include the B-747, B-767, B-777, B-757, A320, and B-737 airplanes.
Document ID
20090034084
Document Type
Conference Paper
Authors
Stevens, Richard
Burcham, Frank W., Jr. (Tybrin Corp. Edwards AFB, CA, United States)
Date Acquired
August 24, 2013
Publication Date
September 21, 2009
Subject Category
Aircraft Stability and Control
Report/Patent Number
DFRC-953
Meeting Information
9th AIAA Aviation Technology, Integration, and Operations Conference(Hilton Head, SC)
Distribution Limits
Public
Copyright
Other