What happened
During the initial climb phase following departure from Kazan Airport, the flight crew identified issues with the aircraft's engine. In response to these complications, the pilot opted to remain at a low altitude and began executing a left-hand turn. Approximately 18 seconds after the initial symptoms appeared, the engine suffered a total loss of power.
While the aircraft type was maneuvering through a bank of 20 to 27 degrees at a speed of 135 km/h, the plane entered a stall. The descent led to a collision with telephone lines, which subsequently triggered a fire upon impact. The crash resulted in one fatality (the pilot) and ten injuries among the other occupants. The aircraft was completely destroyed during the accident.
Findings
Investigations into the accident determined that the primary reason for the engine failure was a rupture within cylinder number 8, which led to overheating and fluid leakage. Additionally, investigators identified cracks in the BSM-9 right magneto slider. These mechanical defects caused the fuel-air mixture inside the intake manifold to ignite, leading to the complete engine failure at a critical low altitude during takeoff.