What happened
During a night training exercise, the flight crew encountered poor visibility caused by marginal weather conditions. While cruising in the vicinity of Ravenglass, the twin engine airplane impacted the slope of Mt Muncaster Fell. The crash site was located approximately 3 km northeast of Ravenglass. All five crew members on board were killed in the accident.
Findings
The official investigation determined that the accident was caused by a controlled flight into terrain. This conclusion reflects the sequence of events where the aircraft, despite being under control, collided with the ground due to the challenging environmental conditions and proximity to the mountainous terrain.