Accident Sequence
During cruise flight, the pilot heard a "loud fluttering metallic sound" originating from the engine, followed by an abrupt stoppage of the propeller. The pilot initiated a forced landing onto a nearby golf course. After touchdown, the pilot noted that due to the downhill slope and wet grass, braking action was minimal. As the airplane crossed rising terrain near the green, the pilot applied full aft controls, and the airplane became airborne. Subsequently, the airplane impacted trees and came to rest upright.
Engine Examination
Examination of the engine revealed that the number three cylinder connecting rod had separated from the crankshaft. The number three journal was gouged, scoured, and displayed evidence of heat distress. Additionally, small amounts of paper fiber, consistent with a shop towel, were found throughout the engine crankcase, oil filter, and oil screen.
Maintenance History
An entry in the engine logbook indicated that the day prior to the accident, the crankshaft, lifters, oil pump impellers, and right magneto had been replaced.