NTSB Identification: IAD01IA009.
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Incident occurred Monday, October 23, 2000 in MORRISTOWN, NJ
Probable Cause Approval Date: 12/18/2001
Aircraft: Raytheon 400A, registration: N792TA
Injuries: 4 Uninjured.

NTSB investigators used data provided by various sources and may have traveled in support of this investigation to prepare this aircraft incident report.

During a descent in preparation for landing, the left wing of the airplane experienced an uncommanded aileron trim input to the up position. Attempts to raise the right wing through the use of the roll trim select switch were unsuccessful on both the pilot and copilot sides of the airplane. The left wing continued to trim up until the left and right trim tabs were fully deflected in opposite directions requiring both pilots to physically control the airplane with full left control column input. The pilots declared an emergency and as airspeed was reduced, controllability improved and an uneventful landing was made. Examination of the roll trim control printed circuit board revealed that the relays on the board had developed a 'time lag,' causing them to stick in the closed position. As of the date of this report, the manufacturer was in the process of redesigning the circuit board.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

The failure of several relays on the roll trim control printed circuit board, which caused an uncommanded aileron trim input.

Full narrative available

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