Casualties unknown

Engine Failure During Cruise Leads to Forced Landing on Tundra; Crankshaft Timing Gear Found Worn (N20024)

Bethel, AK, US

On October 3, 1991, a Cessna 172M (registration N20024) operated by Village Aviation Corp was involved in an aviation accident near Bethel, AK. Investigators recorded the probable cause as: A POWER LOSS OVER UNSUITABLE TERRAIN WHICH RESULTED IN A NOSE OVER. 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 2026-07-04Data APIEditorial standards

During cruise, a loud pop from the engine compartment preceded power loss. The subsequent forced landing on tundra resulted in the airplane nosing over and substantial damage. Examination revealed a severely worn crankshaft timing gear with most teeth missing.

Accident Sequence

While in cruise flight, the pilot heard a loud pop emanating from the engine compartment. Immediately thereafter, the engine ceased producing power. The pilot executed a forced landing on tundra terrain. During the landing, the airplane nosed over and sustained substantial damage.

Post-Accident Examination

Following the accident, an examination of the engine was conducted. The crankshaft timing gear, part number LW-15269, was found to be extremely worn. All but nine of the gear teeth were missing. According to Textron Lycoming, the gear was the original manufactured gear.

Observations

No further details regarding the aircraft type, registration, operator, location, or occupants were provided in the source. The report does not specify any injuries or fatalities, nor does it mention weather conditions or air traffic control involvement. The investigation focused solely on the engine component failure.

Frequently asked questions

What happened in the 3 Oct 1991 Cessna 172M accident near Bethel, AK?

During cruise, a loud pop from the engine compartment preceded power loss. The subsequent forced landing on tundra resulted in the airplane nosing over and substantial damage. Examination revealed a severely worn crankshaft timing gear with most teeth missing.

What aircraft was involved and where did it happen?

The accident on 3 Oct 1991 involved a Cessna 172M, registration N20024, operated by Village Aviation Corp, at Bethel, AK.

What was the probable cause of the accident?

A POWER LOSS OVER UNSUITABLE TERRAIN WHICH RESULTED IN A NOSE OVER.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X18219. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.