Incident Overview
A helicopter that had been stranded on top of a hill for several days due to adverse weather conditions and snowfall was later retrieved. The pilot reported covering the engine inlets with jackets and cushions before leaving the helicopter, as protective coverings were not available. Upon retrieval, snow had accumulated in the inlets.
Recovery and Pre-Takeoff Actions
After the airframe and engine inlets were cleaned of snow and ice buildup, the engine was started and warmed before takeoff.
Loss of Power and Autorotation
Shortly after takeoff, the engine lost power. The pilot initiated an autorotation to slightly sloping terrain, resulting in a hard landing.
Post-Accident Findings
During engine inspection, at least six compressor blades were found bent. The cowling lacked inspection windows that would have allowed the pilot to view the plenum chamber for ice or snow. Post-accident inspection of the engine did not reveal evidence of a mechanical failure or malfunction.