Accident
During the final approach to Oslo-Fornebu Airport, an aircraft stalled and subsequently crashed on the top of a hill located on Nesøya Island, approximately 6 kilometers west of the airfield. The impact destroyed the aircraft, and all 12 occupants on board were killed.
Investigation
The official investigation into the accident was conducted by a commission. The commission examined available evidence to determine the sequence of events leading to the crash.
Probable Cause
The probable cause, as stated in the official findings, was that during the approach, the pilot lost control of the aircraft at a low altitude, making recovery impossible. The commission could not definitively determine why the loss of control occurred. However, two hypotheses were considered: the formation of ice on the stabilizer or the propellers inadvertently shifting to ground fine pitch. The commission considered the latter hypothesis slightly more plausible than the former.