What happened
During an approach to hover, the pilot of the helicopter experienced a loss of engine power while passing through 60 feet above ground level. In response to the power loss, the pilot attempted to enter autorotation by pulling back on the stick, reducing throttle, and lowering the collective.
As the pilot attempted these maneuvers, the engine power increased unexpectedly, accompanied by an adverse yawing motion of the aircraft. The pilot attempted to apply power and recover the aircraft; however, the combination of the rate of descent, low altitude, and the yawing motion prevented a successful recovery. The aircraft subsequently impacted the ground and slid to a stop. The incident resulted in damage to the helicopter, but no injuries were reported.
The investigation
A post-accident examination of the aircraft was conducted. This inspection failed to reveal any pre-impact anomalies regarding the mechanical condition of the engine or the aircraft systems.