Accident Hiller UH-12ET Soloy N135HA, Friday 3 April 1987

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Date:	Friday 3 April 1987
Time:	16:40 LT
Type:	Hiller UH-12ET Soloy
Owner/operator:	Hookspray Service Inc.
Registration:	N135HA
MSN:	HA3035
Engine model:	Allison 250-C20B
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Big Lake, MN - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Private
Departure airport:
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
AIRCRAFT WAS BEING MANEUVERED FOR LANDING ON A GROUND SUPPORT TRAILER WHEN IT EXPERIENCED A POWER FAILURE. DUE TO HIGH TREES AUTOROTATION WAS MADE TO ADJACENT FIELD. AIRCRAFT LANDED ON ROUGH/UNEVEN TERRAIN AND ROLLED OVER. INVESTIGATION REVEALED CONTAMINATED FUEL SYSTEM. APPROXIMATELY ONE GALLON OF A WHITE MILKY SUBSTANCE WAS DRAINED FROM THE SUMP AND ALL MAJOR COMPONENTS OF THE FUEL SYSTEM WERE CONTAMINATED. THE ORIGIN OF THE CONTAMINATION COULD NOT BE DETERMINED.

Probable Cause:

Accident investigation: