On January 15, 1991, a Cessna 172P (registration N62960) operated by Executive Air Terminal was involved in an aviation accident near Charleston, WV. Investigators recorded the probable cause as: TOTAL LOSS OF ENGINE POWER IN CRUISE FLIGHT DUE TO FAILURE OF THE ACCESSORY DRIVE GEAR DOWEL PIN RESULTING IN A FORCED LANDING OVER UNSUITABLE TERRAIN AND SUBSEQUENT NOSE OVER ON LANDING ROLL. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
During a local familiarization flight, a pilot experienced a total loss of engine power and performed a forced landing in a rain-softened field. The airplane nosed over after touchdown. Investigation revealed a sheared dowel pin and non-compliance with service bulletins.
Accident Details
A pilot conducting a local familiarization flight experienced a complete loss of engine power. He executed a forced landing in a field that had been softened by recent rainfall. Upon touchdown, the nose wheel dug into the soft ground, causing the airplane to flip over.
Investigation Findings
Post-crash examination of the engine revealed that the dowel pin for the accessory drive gear had sheared. Further review of the engine overhaul records showed no evidence that Lycoming Service Bulletin (SB) 475 or its predecessor, Service Instruction (SI) 1179D, had been complied with. Examination of the forms used in the engine overhaul shop failed to identify any listing of SB 475 or SI 1179D as items to be checked during the overhaul process.
What happened in the 15 Jan 1991 Cessna 172P accident near Charleston, WV?
During a local familiarization flight, a pilot experienced a total loss of engine power and performed a forced landing in a rain-softened field. The airplane nosed over after touchdown. Investigation revealed a sheared dowel pin and non-compliance with service bulletins.
What aircraft was involved and where did it happen?
The accident on 15 Jan 1991 involved a Cessna 172P, registration N62960, operated by Executive Air Terminal, at Charleston, WV.
What was the probable cause of the accident?
TOTAL LOSS OF ENGINE POWER IN CRUISE FLIGHT DUE TO FAILURE OF THE ACCESSORY DRIVE GEAR DOWEL PIN RESULTING IN A FORCED LANDING OVER UNSUITABLE TERRAIN AND SUBSEQUENT NOSE OVER ON LANDING ROLL. A FACTOR RELATED TO THE ACCIDENT WAS THE IMPROPER PROCEDURE USED DURING ENGINE OVERHAUL.
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