Casualties unknown

Engine failure due to oil leak results in nose-over on tundra (N76078)

Near Kipnuk, AK, US

On September 5, 1982, a Cessna 207A (registration N76078) operated by Bethel Ventures,inc. was involved in an aviation accident near Near Kipnuk, AK. Investigators recorded the probable cause as: The complete loss of engine power due to oil exhaustion caused by a crack in the engine crankcase. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

An aircraft experienced complete engine failure during approach after losing oil pressure, leading to a forced landing where the plane nosed over on soft ground.

What happened

The pilot reported that the aircraft lost oil pressure while flying in normal cruise conditions. Shortly after this initial indication, the engine began running roughly. The engine failed completely while the pilot was on approach for a forced landing. Shortly after touching down on uneven, soft, wet tundra, the aircraft nosed over.

The investigation

An investigation revealed there was a crack in the engine crankcase, PN 633412, where oil had leaked out. A teardown of the engine revealed evidence of oil exhaustion. The pilot reported that there was ample oil when he checked it prior to takeoff.

Probable cause

The complete loss of engine power due to oil exhaustion caused by a crack in the engine crankcase.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20020917X04184. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.