What happened
On the afternoon of the incident, an aircraft departed from Olenek Airport at 16:51 local time. During the initial climb phase, while the aircraft had reached an altitude between 100 and 120 meters, the engine suffered a sudden loss of power.
In response to the power loss, the pilot attempted to execute a left-hand turn to perform an emergency landing at the departure airfield. However, during this maneuver, the aircraft entered a stall and impacted the ground approximately one minute after the initial takeoff. The impact resulted in the total destruction of the aircraft. There were five occupants on board, all of whom sustained injuries during the crash.
Findings
Investigations into the engine failure revealed that the loss of power was caused by a malfunction within the spark plugs. This failure was attributed to an excessive buildup of tetraethyl lead within the components.