Accident Hiller UH-12E Soloy N90461, Thursday 10 May 1984

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Date:	Thursday 10 May 1984
Time:	11:00 LT
Type:	Hiller UH-12E Soloy
Owner/operator:	San Joaquin Helicopters
Registration:	N90461
MSN:	2514
Total airframe hrs:	6373 hours
Engine model:	Allison 250-C20B
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Delano, CA - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Agricultural
Departure airport:	Delano, CA (KDLO)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE HELICOPTER EXPERIENCED AN INFLT FAILURE OF AN ENG MOUNT, PN 63181-5, WHICH BENT THE COLLECTIVE CONTROL ROD & FORCED THE THE COLLECTIVE PITCH INTO THE UP POSITION. THE HELICOPTER THEN SETTLED INTO THE GRAPES IT WAS SPRAYING & MADE A HARD LANDING. AN INVESTIGATION REVEALED THAT THE GUSSET WELD BEADS, JUST BELOW THE OUTER GIMBAL FORWARD ATTACH POINT, HAD FAILED IN FATIGUE.

Probable Cause:

Accident investigation: