Accident
The aircraft was on a cargo flight from Omsk to Surgut, carrying two passengers and a crew of twelve, including six reserve members. The cargo consisted of 12 tons of various construction equipment. While approaching Surgut Airport at night under icing conditions, at an altitude of 400 meters and a speed of 330 km/h, the pilot lost control. The airplane crashed in flames 15 kilometers short of the runway. The aircraft was destroyed, and all 14 occupants were killed.
Probable Cause
The official investigation determined that severe icing conditions prevailed at the time of the accident. The crew had activated all de-icing equipment. However, due to the failure of a valve, the de-icing equipment was inoperative. This led to an excessive accumulation of ice on the fuselage, wings, and all four engines, resulting in a loss of control.