Flight Information
The airplane was conducting a public use flight between two islands, transporting residents of a correctional facility to court hearings.
Incident Description
During descent to the destination airport, at an altitude of approximately 1,400 feet, both engines began surging. The pilot attempted to restore normal engine power but was unsuccessful. He subsequently ditched the airplane in ocean water with both engines still surging.
Aftermath
After the ditching, the airplane remained afloat long enough for the pilot and passengers to exit. It then sank. The airplane was not recovered from the ocean, which precluded examination and determination of the reason for the dual loss of engine power.
Probable Cause
The official probable cause is the loss of engine power in both engines for an unknown reason.