Accident de Havilland Canada DHC-2 Beaver N98JH, Thursday 15 September 1988

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Date:	Thursday 15 September 1988
Time:	18:09 LT
Type:	de Havilland Canada DHC-2 Beaver
Owner/operator:	Willow Air Service
Registration:	N98JH
MSN:	953
Year of manufacture:	1955
Total airframe hrs:	6800 hours
Engine model:	P&W R-985
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Mcgrath, AK - United States of America
Phase:	En route
Nature:	Private
Departure airport:	Inoko River, AK
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHILE CRUISING, THE PILOT-IN-COMMAND EXPERIENCED A ROUGH ENGINE AND FINALLY AN UNEXPLAINED POWER REDUCTION TO IDLE. HE WAS UNABLE TO GLIDE THE FLOAT EQUIPPED AIRPLANE TO A BODY OF WATER AND EXECUTED A FORCED LANDING ON THE TUNDRA WHERE THE AIRPLANE SUSTAINED SUBSTANTIAL DAMAGE. EXAMINATION OF THE ENGINE REVEALED A FAILED EXHAUST VALVE.

Probable Cause:

Accident investigation: