Primary finding
Probable cause
The pilot’s failure to maintain clearance from water during a dark night landing.
Investigator assessment
Analysis narrative
The pilot reported that while attempting to land at his private helipad near a lake at night, he was unable to determine his height above the water. As he prepared to return to the departure airport, the tail rotor contacted the water. The pilot attempted to climb, but the helicopter began an un-commanded yaw to the right. The pilot reduced power and lowered the collective. The helicopter subsequently impacted the water and sustained substantial damage to the main rotor, tail boom, and vertical stabilizer. The pilot reported that there were no preimpact mechanical malfunctions or failures of the helicopter that would have precluded normal operation.