BREESE, IL, USA
N67182
HILLER UH-12D
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.
Source: NTSB Aviation Accident Database
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