What happened
The twin engine aircraft departed from RAF Wigtown for a scheduled training flight destined for Prestwick Airport. The airframe was carrying a crew of five personnel. During the en-route phase, the pilot encountered deteriorating weather conditions characterized by thunderstorms and significantly reduced visibility. Unable to maintain safe separation from terrain in these low-visibility conditions, the aircraft impacted the slope of Mt Caisteal Abhail, located in the northeast section of the Isle of Arran. All five crew members were killed in the accident.
Findings
The official investigation determined that the accident was caused by a controlled flight into terrain. The primary contributing factor was the pilot's encounter with poor weather conditions and thunderstorms, which led to low visibility and ultimately resulted in the impact with the mountain slope.