FT. COLLINS, CO, USA
N9033H
CESSNA 172
THE PLT REPORTED THAT UPON ARRIVAL AT FORT COLLINS, AND WHILE AT CRUISE ALTITUDE, THE ENG SUDDENLY LOST POWER. DURING THE EMERGENCY DESCENT MANEUVERING HE LOST SIGHT OF THE AIRPORT AND LANDED IN A PLOWED FIELD. POST CRASH EXAMINATION OF ENG REVEALED THE CRANKSHAFT ACCESSORY DRIVE GEAR INDEPENDENTLY ROTATED FROM THE CRANKSHAFT. THE RETAINING DOWEL, P/N STD-1065, WAS FOUND SHEARED. THE RETAINING BOLT WAS BACKED OUT 5 OR 6 TURNS. THE SAFETY CLIP WAS IN PLACE AND FUNCTIONAL, BUT NOT ENGAGED.
Source: NTSB Aviation Accident Database
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