Accident Weatherly 620 N4603G, Monday 8 August 1988

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Date:	Monday 8 August 1988
Time:	11:30 LT
Type:	Weatherly 620
Owner/operator:	Private
Registration:	N4603G
MSN:	1506
Engine model:	P&W R-985
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Wilbur, WA - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Agricultural
Departure airport:
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PILOT REPORTED THAT AN ENGINE POWER LOSS OCCURRED DURING AN AERIAL APPLICATION MANEUVER. THE PILOT MADE A FORCED LANDING IN ROUGH TERRAIN. EXAMINATION OF THE ENGINE REVEALED DETERIORATED SEALS IN THE ENGINE DRIVEN FUEL PUMP. EXAM OF THE ELECTRIC FUEL PUMP DISCLOSED SIMILARLY DETERIORATED SEALS.

Probable Cause:

Accident investigation: