Accident Gulfstream American AA-1C N9755U, Thursday 13 June 1991

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Date:	Thursday 13 June 1991
Time:	10:54 LT
Type:	Gulfstream American AA-1C
Owner/operator:	Private
Registration:	N9755U
MSN:	AA1C-0114
Total airframe hrs:	1557 hours
Engine model:	Lycoming O-235-L2C
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Union Hall, VA - United States of America
Phase:	En route
Nature:	Private
Departure airport:	Wilson, NC (W03)
Destination airport:	Beckly, WV (KBKW)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PILOT WAS AT CRUISE ALTITUDE WHEN HE EXPERIENCED A PARTIAL LOSS OF POWER. HE TRIED TO ANALYZE HIS PROBLEM WITH NO SUCCESS. HE THEN EXPERIENCED A FURTHER POWER LOSS AND ELECTED TO DIVERT TO A NEARBY AIRPORT. THE ENGINE COULD NOT PRODUCE ENOUGH POWER TO MAINTIAN ALTITUDE SO THE PILOT FOUND IT NECESSARY TO MAKE A FORCED LANDING IN AN OPEN FIELD. AFTER TOUCHDOWN, THE AIRCRAFT STRUCK A HIDDEN OBSTRUCTION WHICH TORE AWAY THE LEFT AND NOSE LANDING GEAR.

Probable Cause: THE LOSS OF ENGINE POWER BROUGHT ON BY A FAILURE OF THE NUMBER THREE CLYINDER EXHAUST VALVE. CONTRIBUTING TO THE ACCIDENT WAS A HIDDEN OBJECT ON THE EMERGENCY LANDING FIELD.

Accident investigation: