Flight Details
The aircraft had been modified with an air-driven winch for towing gunnery targets. It was operating in conjunction with a warship for scheduled sea/air gunnery practice. Weather conditions in the area were reported as overcast at 4000 feet, wind 060 degrees at 15-20 knots, and visibility of 15-20 kilometers.
Sequence of Events
At about 1717 hours, the aircraft was instructed to commence gunnery tracking runs at an altitude of 1000 feet with the sleeve target not deployed. Between 1720 and 1735 hours, the aircraft carried out two such runs from the west and east. The aircraft then tracked south, away from the ship, to a distance of about 10 kilometers. At about 1738 hours, the aircraft was instructed to turn inbound for a run from astern. At about 1739 hours, the pilot reported engine problems and about one minute later advised, "I've got problems, Mayday, I'm going in."
Search and Wreckage
Crewmen stationed near the stern of the ship reported seeing the aircraft dive into the sea. The warship immediately turned back towards the crash position. Other warships and aircraft were also ordered to the crash position. The only wreckage sighted was at the crash datum, believed to be a section of wing, located about two meters below the surface. It sank before recovery. The approximate water depth at the crash position is 450 fathoms. No trace of the aircraft or its occupants has been discovered to date.
Investigation and Probable Cause
The investigation established that the flight crew were properly qualified, and the aircraft was appropriately certified and maintained. The flight was conducted in accordance with the operating contract. At the time, the sleeve target was not deployed and no firing was taking place. No evidence suggested an in-flight structural failure or fire. The target towing equipment installation was not considered a factor. There was a loss of control following an apparent engine malfunction. The precise reasons for the accident have not been established. Relevant factors included apparent engine failure or malfunction and loss of control for undetermined reasons.