NTSB Identification: NYC04LA210.
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Accident occurred Sunday, September 12, 2004 in Wiscasset, ME
Probable Cause Approval Date: 10/27/2005
Aircraft: Cessna 172B, registration: N7422X
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 began to lose oil pressure. Thirty seconds later, the engine quit, and the pilot performed a forced landing to a field. During the landing, the airplane struck trees and flipped over. Examination of the engine revealed oil in the engine compartment and an oil leak that originated from the seal where the oil filter adapter attached to the crankcase. A subsequent teardown of the engine reveled that the number 1 connecting rod was fractured and exhibited thermal signatures, consistent with high temperatures. Fragments of bearing and connecting rod material were located in the oil sump. The fragments were blackened, consistent with exposure to high temperatures. In addition, the crankshaft exhibited thermal damage and smearing on the number 1 and number 2 connecting rod journals.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The failure of the oil filter adapter seal, which resulted in a loss of oil pressure, and subsequent catastrophic engine failure, and forced landing. Full narrative available
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