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Meeting	ACGS Committee Meeting 103 - Seattle - February 2009
Agenda Location	9 SUBCOMMITTEE E – FLIGHT, PROPULSION, AND AUTONOMOUS VEHICLE CONTROL SYSTEMS 9.2 Propulsion Controlled Aircraft Recovery (PCAR)
Title	Propulsion Controlled Aircraft Recovery (PCAR)
Presenter	Dick Stevens and Bill Burcham
Affiliation	Counter-MANPADS Program, Mantech-SRS
Available Downloads*	none
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	If normal aircraft flight controls are lost, emergency flight control may be attempted using only the thrust of engines. Collective thrust is used to control flight path, 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, and, in general, most transports can be recovered over most if not all the flight envelope. 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 often very difficult. There are favorable aircraft configurations, and also techniques that will improve recoverability and control and increase the chances of a survivable landing. This paper discusses TLOH recoverability as a function of conditions, and TOC effectivity results for a range of transport airplanes from simulation and flight, and some key techniques for flying with throttles and making a survivable landing. Airplanes evaluated include the MD-11, B-737, B-747, B-757, B-767, B-777, A300 and A320. Mr. Burcham is a consultant to NASA Dryden Flight Research Center *Mr. Stevens is a member of the Systems Engineering and Technical Assistance support team for the DHS Counter-MANPADS Program Office and lead for Test and Evaluation