What happened
The aircraft completed its takeoff roll normally, rotating at a speed of 220 km/h. Approximately five seconds after leaving the ground, while maintaining an altitude of 10 meters, the left engine experienced a failure. In response to this event, the left propeller automatically feathered, allowing the crew to maintain their climb.
Thirty-four seconds into the flight, at an altitude of 30 meters and a speed of 230 km/h, the crew retracted the flaps. Shortly thereafter, while flying at 40 meters with a speed of 227 km/h, the pilot-in-command began a left turn. During this maneuver, the aircraft drifted to the left, lost airspeed, and entered a stall. The plane subsequently impacted a pipeline belonging to the Neftyanyye Kamni Oil Company, resulting in a post-crash fire. The accident resulted in 56 fatalities (comprising two crew members and 54 passengers) and 8 injuries.
Findings
Investigations revealed that several blades on the first stage of the turbine had disintegrated. This structural failure was attributed to a degradation of mechanical properties caused by prior overheating, likely exceeding temperatures of 1,150°. While the disintegration was confirmed, investigators could not determine the specific cause or the exact timing of the overheating event.