Accident
At 0613 local time, while cruising at an altitude of 4,000 meters, the crew informed air traffic control that they had passed over the city of Rushan eight minutes earlier. Shortly thereafter, weather conditions deteriorated, and the crew encountered clouds and low visibility. The aircraft, now at an altitude of 4,800 meters, lost height due to a strong downdraft and impacted the south slope of a mountain located near the Yauza Pass, approximately 15 kilometers northwest of Rushan. The aircraft disintegrated on impact, and all seven occupants were killed. The wreckage was discovered two days later at an altitude of 4,800 meters, about 100 meters below the summit of the mountain.
Investigation
The official investigation into the accident determined that the aircraft lost height due to a downdraft. It was also found that, at the time of the accident, the aircraft was off its intended course. The pilot in command had decided to modify the route for reasons that could not be determined.
Probable Cause
The probable cause of the accident, as stated in the official findings, is that the aircraft lost height due to a downdraft and was off course because the captain decided to modify the route for undetermined reasons.