On September 14, 1992, a Cessna 188B (registration N9747G) operated by Dahl Airspray, Inc. was involved in an aviation accident near Cogswell, ND. Investigators recorded the probable cause as: The failure of the number 6 piston rod retaining pin boss on the underside of the number 6 piston, which resulted in a complete loss of engine power during flight. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced a complete loss of power while conducting aerial application operations, resulting in a forced landing in a potato field where the aircraft nosed over.
What happened
The pilot was conducting aerial application operations when the aircraft suffered a complete loss of power. Unable to maintain altitude or continue the mission, the pilot executed a forced landing in an adjacent potato field. During the landing rollout, the airplane nosed over, coming to rest on its nose.
The investigation
A thorough examination of the engine was conducted to determine the cause of the power failure. Investigators focused on the internal components of the engine block and piston assemblies. The inspection revealed a critical mechanical failure within the number 6 piston assembly.
Probable cause
The failure of the number 6 piston rod retaining pin boss on the underside of the number 6 piston, which resulted in a complete loss of engine power during flight.
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