Accident
A post-maintenance flight departed Leeds-Bradford Airport in the mid-morning, carrying one pilot and one engineer. The aircraft was scheduled for transfer to Pakistan the following day on behalf of the United Nations Organization. Witnesses observed the aircraft on final approach to runway 15, flying more slowly than usual and at a low height. As the aircraft turned onto final approach, it developed into a spin to the left. After two or three rotations, the aircraft crashed into a wooded area and caught fire. Both occupants were killed.
Investigation
Investigators examined the circumstances of the accident, including the aircraft's performance and environmental conditions. It was noted that the aircraft's flap system had been modified, which affected its handling characteristics.
Cause
The official investigation concluded that the aircraft entered the spin from an accelerated stall, possibly as a result of the pilot attempting to regain the approach centerline by a higher rate of turn than normal. The relatively slow speed of the aircraft, the gusty conditions, and the handling characteristics associated with the aircraft's modified flap system were considered contributory factors.