What happened
During a flight intended for geological support operations, an aircraft was performing its approach to the Yessey Airstrip. While executing the fourth turn of the arrival sequence, the pilot-in-command attempted to adjust the aircraft's bank angle. This corrective action resulted in an unintended increase in the roll, reaching an angle of 45 degrees.
As a consequence of this maneuver, the aircraft lost altitude and impacted the surface of the icy Yessey lake. The crash occurred approximately 5 km away from the local village. Despite the impact, there were no casualties reported from the incident.
Findings
Investigations into the accident determined that the primary factor was an inappropriate roll correction performed by the pilot during the approach phase. This maneuver caused the aircraft to bank excessively, leading to a loss of altitude and the subsequent impact with the lake surface.