What happened
During the initial climb phase following departure from Sredlarnekomsk Airport, the aircraft reached an altitude of approximately 150 meters when the engine began to misfire. This malfunction led to a significant loss of power and the appearance of flames emerging from the right side of the engine compartment.
In response to the emergency, the crew attempted to perform an unplanned landing. However, during the procedure, the battery was accidentally deactivated, which prevented the pilot from deploying the flaps. Consequently, the aircraft type impacted the ground at a high rate of speed. The impact caused the undercarriage and the lower portions of the wings to detach, and the fuselage eventually broke into two separate pieces. While the aircraft was completely destroyed, all five occupants were successfully rescued from the wreckage without loss of life.
Findings
Investigations conducted by the State Research Institute of Civil Aviation determined that the engine failure originated from a malfunction in the rear spark plug of the second cylinder. Specifically, the central electrode detached from the plug because the insulator failed due to internal stresses and a microcrack formed during the manufacturing process. The investigation concluded that the accident was caused by a defect in the design and production of the spark plug.