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Meeting	ACGS Committee Meeting 112 - Annapolis, Maryland - October 2013
Agenda Location	7 SUBCOMMITTEE C – AVIONICS AND SYSTEM INTEGRATION 7.1 Limits of Stable Regulation as a Factor in Aircraft Loss-of-Control
Title	Limits of Stable Regulation as a Factor in Aircraft Loss-of-Control
Presenter	Harry Kwatny
Affiliation	Drexel University
Available Downloads*	presentation
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	Harry Kwatny Department of Mechanical Engineering and Mechanics Drexel University Loss]of]Control (LOC) is a major factor in fatal aircraft accidents. Although definitions of LOC remain vague in analytical terms, it is generally associated with flight outside of the normal flight envelope, with nonlinear influences, and with a significantly diminished capability of the pilot to control the aircraft. Primary sources of nonlinearity are the intrinsic nonlinear dynamics of the aircraft and the state and control constraints within which the aircraft must operate. This presentation examines how these nonlinearities affect the ability to control the aircraft and how they may contribute to loss]of]control. Specifically, the ability to regulate an aircraft near stall points is considered, as is the question of how damage to control effectors impacts the capability to remain within an acceptable envelope and to maneuver within it. It is shown that even when a sufficient set of steady motions exist, the ability to regulate around them or transition between them can be difficult and non]intuitive, particularly for impaired aircraft. Examples are provided using NASA's Generic Transport Model.