Occurrence
During final approach to Sion Airport's runway 26, the pilot maintained radio contact with air traffic control, and all appeared normal onboard. At low altitude and low speed, the airplane banked left, then right, before losing control and crashing in flames on a road in the city center. The aircraft and several cars were destroyed, and a few buildings sustained damage. Both occupants were killed, while no one on the ground was injured.
Investigation
The official investigation determined that the left engine was running abnormally fast at the time of impact, whereas the right engine was at idle. No technical issues were found with the engines.
Probable Cause
Investigators concluded that the pilot likely made a mistake during the approach by unintentionally shutting off the fuel supply to the right engine. This action caused the aircraft to become unstable, and the pilot was unable to correct the situation, leading to the loss of control and subsequent crash.