Accident Air Tractor AT-301 N4340S, Monday 17 April 1989

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Date:	Monday 17 April 1989
Time:	09:15 LT
Type:	Air Tractor AT-301
Owner/operator:	Thomas Hill
Registration:	N4340S
MSN:	301-0020
Year of manufacture:	1975
Total airframe hrs:	5745 hours
Engine model:	P&W R-1340-AN-1
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Grangeville, ID - United States of America
Phase:	Initial climb
Nature:	Agricultural
Departure airport:
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
A PARTIAL POWER LOSS OCCURRED DRG INITIAL CLIMB. THE PLT JETTISONED HIS LOAD & LANDED IN A SOFT FIELD ABOUT 3/4 MI FROM THE RWY, WHERE THE ACFT NOSED OVER. A FIRE ERUPTED, WHICH SELF-EXTINGUISHED MINUTES LATER. THE OPERATOR RPRTD THAT A 10 INCH DROP IN MANIFOLD PRESSURE HAD OCCURRED & THAT A SUSPECTED BLOWER FAILURE WAS THE REASON FOR THE POWER LOSS.

Probable Cause: A PARTIAL POWER LOSS DUE TO A BLOWER FAILURE. A FACTOR RELATED TO THE ACCIDENT WAS THE SOFT FIELD CONDITION.

Accident investigation: