Incident Overview
A training flight with an instructor and student pilot aboard experienced a complete loss of engine power, leading to a forced landing in deep snow. The aircraft, which was fully fueled at departure, had been airborne for 45 minutes before turning back towards the airport.
Sequence of Events
While approximately 3 miles from the airport, the engine began to run roughly, and the RPM dropped steadily from full power until a complete loss of power occurred. Attempts to restore power were unsuccessful. The crew executed a forced landing in deep snow, during which the airplane nosed over.
Post-Accident Findings
Following the incident, the engine was functionally tested and operated satisfactorily. The operator noted that the airplane had not flown recently and that there had been a substantial snowfall. The operator suspected that the fuel may have been contaminated with water.
Conclusion
No official cause was determined for the power loss. The engine's satisfactory post-accident performance suggests a temporary issue, with water contamination as a possible explanation per the operator.