Fatal Return Flight from Mys-Kamennyy Airport Due to Dual Left-Engine Failure (CCCP-11031)

Incident Overview and Initial Climb On the evening of the accident, the crew was returning to Tyumen after delivering equipment for a local oil exploitation company. The aircraft departed Mys-Kamennyy Airport at 1911LT in snow showers that reduced visibility to 1.8 km. During the initial climb, the crew received clearance to climb to 6,600 meters. Four minutes after departure, the captain declared an emergency, reporting that both left engines had failed. The crew was cleared to return to Mys-Kamennyy Airport and began a return circuit. ## Approach and Crash Sequence At a distance of 18 km from the airfield, the captain reported the runway in sight and lowered the landing gear shortly afterward. The aircraft then reduced its altitude to 250 meters when it was eight km from the runway. At five km, the captain reported that the aircraft was losing altitude and was instructed to turn right. Shortly later, at a speed of 220 km/h, the airplane crashed in an icy swamp located 2.2 km short of the runway and 450 meters to the left of its extended centerline. The aircraft was destroyed, and all eight occupants were killed. ## Investigation Findings The official investigation was unable to determine the exact cause of the failure of both left engines. However, the possibility that ice crystals or pellets clogged a fuel line or fuel filter was not ruled out, nor was a valve failure. Poor weather conditions were considered a contributing factor.