NTSB Identification: SEA95LA155.
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Accident occurred Wednesday, July 12, 1995 in VASHON, WA
Probable Cause Approval Date: 12/04/1995
Aircraft: CESSNA 172P, registration: N52139
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE IN CRUISE FLIGHT, THE ENGINE SUDDENLY MADE A LOUD SOUND, BEGAN TO SHAKE, THEN LOST POWER. THE PILOT INITIATED A FORCED LANDING TO AN OPEN FIELD. THE AIRPLANE TOUCHED DOWN, BOUNCED AND BECAME AIRBORNE BEFORE TOUCHING DOWN THE SECOND TIME. THE NOSE GEAR COLLAPSED AND THE AIRPLANE SLID TO A STOP. POST CRASH EXAMINATION REVEALED HOLES IN THE CRANKCASE. A TEARDOWN OF THE ENGINE FOUND THAT THE NUMBER THREE AND FOUR CONNECTING ROD CAP BOLTS SEPARATED. A METALLURGICAL EXAMINATION OF THE FRACTURED BOLTS REVEALED FEATURES CHARACTERISTIC OF A PROGRESSIVE OVERSTRESS. THE METALLURGICAL SPECIALIST REPORTED THAT THE SEPARATION MOST LIKELY OCCURRED DUE TO AN INADEQUATELY TORQUED NUT OR LOSS OF PRESTRESS OVER A PERIOD OF TIME.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE LOSS OF ENGINE POWER DUE TO CONNECTING ROD BOLT OVERLOAD FAILURE. THE ROUGH, UNEVEN TERRAIN IN THE EMERGENCY LANDING AREA WAS A FACTOR.

Full narrative available

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