Accident Hiller UH-12D N67182, Tuesday 24 September 1985

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Date:	Tuesday 24 September 1985
Time:	07:15 LT
Type:	Hiller UH-12D
Owner/operator:	Private
Registration:	N67182
MSN:	1160
Total airframe hrs:	9118 hours
Engine model:	Lycoming VO-435-A1C
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Breese, IL - United States of America
Phase:	En route
Nature:	Agricultural
Departure airport:	Breese, IL
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PLT REPORTED THAT THE ENG BEGAN LOSING POWER WHILE HE WAS EN ROUTE AT AN ALT OF APRX 200 FT AGL. HE TURNED & INITIATED AN AUTOROTATION TO A ROAD CONSTRUCTION SITE. THE HELICOPTER LANDED TAIL LOW. SUBSEQUENTLY, THE TAIL BOOM WAS CHOPPED OFF & THE HELICOPTER BOUNCED & ROTATED 180 DEG. AN EXAM OF THE ENG REVEALED THE #4 PISTON HAD FAILED. THE PISTON HAD BURNT & MOLTEN ALUMINUM HAD TRANSFERRED TO THE STEM OF THE EXHAUST VALVE CAUSING IT TO STICK OPEN.

Probable Cause:

Accident investigation: