Accident
On the day of the accident, the crew completed two geophysical missions in the morning on behalf of the Severo-Yeniseysk expedition. In the afternoon, four passengers were illegally embarked for a fishing party on the Kotui River. That evening, while flying back to Chirinda, the airplane suddenly lost height, struck tree tops, and crashed in flames in a wooded area on the slope of a mountain at an elevation of 480 meters, approximately 6 kilometers southwest of Chirinda. The burned wreckage was found 132 meters below the summit, and all seven occupants were killed.
Probable Cause
The exact cause of the accident could not be determined. However, it was considered that the engine probably failed in flight because the fuel quantity in both tanks was insufficient: 110 liters instead of the minimum 300 liters required.