Primary finding
Probable cause
The pilot’s failure to maintain clearance from power lines while herding livestock.
Investigator assessment
Analysis narrative
The pilot was attempting to herd livestock when the helicopter contacted a powerline which damaged the main rotor system and resulted in a loss of control. The helicopter crash-landed into a shallow ditch and came to rest on its right side. The pilot was able to egress with minor injuries before the helicopter was destroyed by a post-impact fire. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.