NTSB Factual Report

The pilot initiated an intentional autorotation to a landing site at the destination airport. He recalled that after entering the autorotation, the helicopter drifted and that reaching the intended touchdown point became questionable. The pilot reported that he had intended to add power and continue to the intended landing site, but the helicopter did not seem to respond as expected. The pilot was unable to reduce the descent rate and the helicopter subsequently impacted the ground at the point of intended landing. A post accident inspection did not reveal any anomalies associated with the helicopter.

NTSB Probable Cause

The pilot's failure to maintain adequate main rotor speed during the intentional autorotation, and his subsequent inability to reduce the descent rate prior to impact. A contributing factor was the intentional autorotation initiated by the pilot.