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Meeting	ACGS Committee Meeting 96 - Hilton Head - October 2005
Agenda Location	8 SUBCOMMITTEE A - AERONAUTIC AND SURFACE VEHICLES 8.2 T-45 Stability Augmented Steering System
Title	T-45 Stability Augmented Steering System
Presenter	Christina Stack
Affiliation	Naval Air Systems Command
Available Downloads*	presentation video1 video2
	Downloads are available to members who are logged in and either Active* or attended this meeting.
Abstract	The poor ground-handling characteristics of the T-45 Goshawk (a U.S. trainer variant of the Hawk aircraft) have been well documented since initial flight test and fleet introduction in 1992. Several runway departures and Class A mishaps have been attributed to this deficiency over the years. Multiple attempts have been made to correct this deficiency, but have met with limited to no improvement. In 2002, however, flight test began on the Stability Augmented Steering System (SASS), providing yaw-rate feedback to the NWS to nullify undesired yaw rates and decrease control sensitivity. The majority of testing was conducted during high-speed taxi and roll-and-go tests. To properly evaluate SASS new test techniques were developed, including Runway Offset Captures and Holds (ROCHs), ROCHs with Braking and Heading Attitude Bandwidth metrics (measured via rudder-pedal frequency sweeps during high-speed taxi). Several valuable lessons-learned were captured for conducting ground handling tests: risk mitigation for runway departures; test-team roles and responsibilities during high-workload events; thermal management during frequent braking operations; effective comparative testing of control gains; and many others. SASS testing concluded in 2004, and SASS is currently being incorporated in the T-45 Training Fleet.