Flight and Incident
The pilot reported that the helicopter was on a reconnaissance flight to survey a proposed powerline project. During the flight, the engine flamed out and the pilot initiated an autorotation. He maneuvered the helicopter to land in a clearance, but struck the top of a tree about 35 feet above ground level. The helicopter then traveled 90 feet horizontally and impacted on soft, sloping muskeg.
Post-Accident Examination
An examination of the aircraft and engine revealed no preimpact failures. The engine performed normally during an operational check conducted after the accident.
Weather and Equipment
According to the pilot and passengers, the helicopter had been flown through at least one area of wet snow showers. However, the intensity of the showers was not determined. The helicopter was equipped with auto-ignition, an anti-ice system, and a modification to the engine inlet screen and inspection door to reduce foreign object debris and snow ingestion.