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Casualties unknown

Forced Landing Due to Engine Failure During Descent (N92807)

Frederick, CO, US

On June 1, 1986, a Cessna 207 (registration N92807) was involved in an aviation accident near Frederick, CO. Investigators recorded the probable cause as: The engine quit unexpectedly when power was added during the final approach, despite a normal post-incident engine test and no reported mixture adjustments by the pilot. 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

A pilot descended from 8,200 feet to prepare for landing when the engine quit upon adding power, resulting in a forced landing. The engine tested normally afterward.

What happened

The pilot was conducting a flight and initiated a descent from an altitude of 8,200 feet above ground level (AGL) down to 700 feet AGL in preparation for landing. As the aircraft approached the lower altitude, the pilot began to add power to maintain or adjust the approach. At that moment, the engine ceased operation without warning. Consequently, the pilot was forced to execute a landing without engine power.

The investigation

Following the incident, an investigation was conducted to determine the cause of the engine failure. During this process, the pilot stated that he had not made any mixture adjustments during the descent phase. To verify the mechanical condition of the aircraft, the engine was subsequently test-run. The results showed that the engine functioned normally during the post-incident inspection.

Probable cause

The engine quit unexpectedly when power was added during the final approach, despite a normal post-incident engine test and no reported mixture adjustments by the pilot.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X33828. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.