Accident Summary
During cruise flight, the propeller assembly separated from the engine. The pilot performed an emergency ditching of the airplane alongside an oil platform located approximately 10 miles from land. The pilot, his wife, and two small children exited the aircraft and attempted to swim to the platform. Sea conditions were rough, and no raft or life vests were onboard the airplane. The pilot's wife and children were lost at sea.
Investigation Findings
Examination of the engine mounts and crankshaft revealed no evidence of fatigue or pre-existing fractures. The investigation did not identify a mechanical failure in those components.
Previous Incident
Approximately four years prior to this accident, the airplane had been involved in a gear-up landing. That incident resulted in the propeller blades being curled back approximately 30 degrees up to 8 inches from the tips. The blades were subsequently straightened and returned to service. According to the manufacturer, this repair was not in accordance with their service manual, and the blades should have been replaced.