Primary finding
Probable cause
Failure of the engine crankshaft due to an oil passage hole being blocked. Contributing to the accident was the unsuitable terrain.
Investigator assessment
Analysis narrative
The pilot stated that while in cruise flight he heard 3 loud bangs from the engine, then it seized. Disassembly of the engine found the sludge plug dislodged, and the crankshaft broken at the no. 3 rod journal.
Source record
Factual narrative
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