What happened
The aircraft departed RAF Moreton-in-Marsh to conduct a training mission for the 21st OTU. While flying at low altitude in deteriorating weather conditions, the twin-engine plane collided with the eastern slope of Mt Foel-fras within the Snowdonia region of north Wales.
The impact resulted in serious consequences for the four-person crew. The observer was killed in the accident, while the remaining three crew members sustained injuries.
Findings
Investigation determined that the crash was caused by a navigational error. Specifically, a misinterpretation of the chart by part of the crew led to a controlled flight into terrain.