What happened
A special mission flight was traveling from Yakutsk toward Sangar, with a scheduled stop in Kobyay, to transport medical personnel to remote communities. Shortly after departing from the Yakutsk-Magan Airport, the aircraft was cruising at an altitude of 1,150 meters and a velocity of 180 km/h when the engine began to vibrate significantly. This was accompanied by a loss of power, a reduction in airspeed, and a drop in oil pressure.
In response to the mechanical issues, the pilot attempted to perform an emergency landing within a marshy region. During the landing sequence, the aircraft traveled approximately 32 meters before nosed over. The accident resulted in one fatality among the passengers, while the remaining occupants sustained injuries, including four serious injuries.
Findings
The investigation determined that the engine failure was triggered by the failure of the first cylinder and piston caused by fatigue.