What aircraft was involved and where did it happen?

The accident on 1988-12-20 involved a Beech A36, registration N17696, at Athens, GA.

Engine Exhaust Valve Failure Forces Emergency Landing (N17696)

On December 20, 1988, a Beech A36 (registration N17696) was involved in an aviation accident near Athens, GA. Investigators recorded the probable cause as: Failure of the number one exhaust valve. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

While cruising at 6,000 feet, a pilot experienced intense engine vibration, reduced power, and began a descent. The engine lost power before reaching an airport, leading to a wheels-up landing. Examination revealed a failed exhaust valve.

Summary

While cruising at 6,000 feet, the pilot felt intense vibration from the engine. Power was reduced and a descent was initiated toward a nearby airport. Before reaching the airport, the engine lost power, and an emergency wheels-up landing was made in an open field.

Examination Findings

An examination of the engine revealed that the number one exhaust valve had failed. The valve guide was battered and broken, and was loose in its bore. The bore was fretted and had become oversized.

Maintenance History

The engine had been overhauled and installed in the aircraft on January 20, 1982, with a total time of 1,515 hours. According to the log book, new valves and valve guides had been installed at that time. The engine time since major overhaul was 1,041 hours.

Probable cause

Failure of the number one exhaust valve.

1988-12-20: Beech A36 (N17696) — Athens, GA