Accident Overview
A multi-occupant aircraft departed from Kazan Airport. Shortly after takeoff, while climbing, the crew noted engine problems. The captain chose to maintain a low altitude and began a left turn. Eighteen seconds later, the engine failed completely. During the turning maneuver at a bank angle of 20 to 27 degrees and a speed of 135 km/h, the airplane stalled. It then struck telephone wires and crashed in flames. The captain was killed, ten other occupants were injured, and the aircraft was destroyed.
Sequence of Events
The flight originated from Kazan Airport. After departure, as the aircraft climbed, the crew encountered difficulties with the engine. The captain decided not to gain altitude but instead to remain low and initiated a left-hand turn. The engine subsequently failed entirely 18 seconds after the first indication of trouble. The aircraft, while banked between 20° and 27° and at an airspeed of 135 km/h, experienced an aerodynamic stall. The loss of control led to the aircraft descending and striking telephone wires before impacting the ground. The ensuing fire destroyed the aircraft. The captain sustained fatal injuries, and ten other individuals aboard suffered injuries.
Probable Cause
The official investigation's probable cause was engine failure at low height after takeoff over a populated area. The primary cause of the engine failure was a rupture of cylinder number 8, leading to a coolant leak and overheating. Additionally, cracks present in the right magneto slider BSM-9 contributed to the failure. This combination caused ignition of the fuel-air mixture in the intake manifold, resulting in complete loss of engine power.