On September 15, 1992, a Piper PA-22 (registration N8005C) operated by Graham, Robert L. was involved in an aviation accident near Jasper, TN. Investigators recorded the probable cause as: The number 2 cylinder exhaust valve had become stuck in the open position. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During cruise, a pilot heard a bang followed by engine power loss over mountainous terrain. A forced landing in a logged clearing resulted in a nose-over when the nose wheel struck a cut log.
Incident
While in cruise flight, the pilot heard a bang and subsequently experienced a loss of engine power. The aircraft was flying over terrain characterized by dense woods and mountains. The pilot executed a forced landing into a logging clearing. During the landing roll, the nose wheel contacted a cut log, causing the aircraft to nose over.
Investigation
A post-accident examination of the engine was conducted. The investigation revealed that the number 2 cylinder exhaust valve had become stuck in the open position. The cylinder and piston showed extensive impact damage resulting from the fractured valve.
Probable cause
The number 2 cylinder exhaust valve had become stuck in the open position.
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