What happened
A special flight was being conducted through several stops, beginning in Keperveem and proceeding via Chersky and Chokurdakh before the final destination of Deputatsky. Following departure from Chokurdakh, the aircraft encountered adverse weather conditions which led to a loss of navigational orientation for the crew. This resulted in the flight path drifting approximately 110 km away from the intended trajectory.
As the onboard fuel supply was exhausted, the crew initiated an emergency landing procedure. The aircraft subsequently crash-landed roughly 13 km from Deputatsky. While the impact caused the airframe to be damaged beyond repair, all three crew members managed to exit the wreckage without any injuries.
Findings
Investigations into the incident revealed that the primary reason for the deviation was a failure by the crew to accurately account for wind components during the leg from Chokurdakh to Deputatsky. This error caused the flight duration to extend by 2 hours and 22 minutes beyond the original plan. Consequently, the insufficient fuel reserves left the crew unable to complete the flight as scheduled, necessitating the emergency descent.