On June 24, 1997, a Mooney M20C (registration N6756N) was involved in an aviation accident near Bellwood, PA. Investigators recorded the probable cause as: the total loss of engine power due to failed connecting rods. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced a loss of engine power and smoke in the cockpit during cruise, leading to a forced landing in a hay field. Post-landing fire was extinguished, and engine examination revealed a crankcase hole and connecting rod failures.
Incident Overview
During cruise flight at 4,000 feet, the pilot heard a 'pop' and subsequently experienced a loss of engine power along with smoke entering the cockpit. He was in contact with air traffic control and received vectors for landing at the nearest airport. As the descent progressed, the oil pressure dropped to zero and the engine ceased producing power.
Emergency Descent and Landing
The pilot's vision became obscured through the windscreen, rendering him unable to complete a landing at the airport. Using a side window for visibility, he selected an open hay field and executed a forced landing. After touchdown, a fire in the engine compartment was extinguished.
Post-Incident Examination
Inspection of the engine revealed a hole in the crankcase below the number one cylinder. Further examination identified failure of the connecting rods on both the number one and number two cylinders.