Accident Sequence
The crew was conducting a sea supply mission on behalf of the Central Intelligence Agency (CIA). While flying at a low height, the pilot-in-command initiated a left turn. During the maneuver, the left wing struck the water surface, causing the aircraft to crash into the sea several kilometers off Hua Hin. The aircraft was destroyed in the impact and all seven occupants were killed.
Probable Cause
The official investigation determined the probable cause to be wrong evaluation on the part of the flying crew, who misjudged the distance between the aircraft and the water surface during the low-level supply mission.