Incident Description
Approximately two hours into a cross-country flight over water, the pilot noticed a distinct change in engine noise and observed erratic torque readings from the engine. Shortly thereafter, the airplane experienced a complete loss of engine power.
Emergency Procedures
The pilot declared an emergency and attempted to diagnose the problem, including efforts to restart the engine. These attempts were unsuccessful, and the airplane was forced to ditch in the ocean.
Outcome
The ditching occurred approximately 175 miles from land, in water exceeding 5,000 feet in depth. The aircraft was not recovered following the incident.
Investigation
Due to the aircraft's location and depth of the water, recovery was not possible. The investigation was unable to determine the reason for the loss of engine power. The official probable cause is stated as a total loss of engine power for undetermined reasons.