Primary finding
Probable cause
The pilot’s failure to maintain yaw control during a tailwind approach, which resulted in a loss of tail rotor effectiveness, an uncommanded spin, and subsequent hard landing.
Investigator assessment
Analysis narrative
The pilot reported that during the approach to land, he initiated a left turn to align with the wind and landing pad when the helicopter entered an uncommanded right spin. He attributed the loss of control to an 18-knot tailwind and described the event as consistent with a loss of tail rotor effectiveness. He was unable to regain control, and the helicopter descended in a spiraling right turn before impacting the ground. A post-accident review of photographs by the NTSB investigator confirmed that the helicopter sustained substantial damage to the fuselage. The pilot reported that there were no pre-accident malfunctions or failures with the helicopter that would have precluded normal operation.