What happened
Friendship Flight 305 was operating a scheduled commuter route from Chevak, Alaska, to Bethel, Alaska. During the cruise phase of the flight, the aircraft experienced an engine failure. This mechanical issue necessitated a forced landing on rough, snow-covered terrain.
The pilot-in-command reported that he observed a connecting rod resting in the bottom of the engine cowling. Additionally, the engine crankcase was found to have a gaping hole in its side.
The investigation
Examination of the aircraft revealed significant internal damage. The pilot noted a connecting rod located within the engine cowling. The engine crankcase sustained substantial damage, characterized by a large opening on its side.
Findings
The primary factor leading to the incident was an engine failure. The mechanical evidence indicated severe internal component failure, specifically involving the connecting rod and the structural integrity of the crankcase.