Primary finding
Probable cause
The pilot’s failure to maintain clearance from a wire during an agricultural application flight.
Investigator assessment
Analysis narrative
The commercial pilot was performing an agricultural application flight and completed two reconnaissance passes and orbits of the field he was about to spray. The pilot reported that he did not see any power lines that posed a danger for the flight. While maneuvering at a low altitude during a pass turn, the helicopter struck a wire that the pilot did not see. After the helicopter struck the wire, the helicopter windscreen failed, and the helicopter violently shook. The pilot entered an autorotation to the field, and the helicopter impacted terrain and came to rest on its right side. The helicopter sustained substantial damage to the fuselage, tailboom, and main rotor blades. The pilot reported no mechanical failures or malfunctions of the helicopter.
Source record
Factual narrative
The commercial pilot was performing an agricultural application flight, and completed two reconnaissance passes and orbit of the field he was about to spray. The pilot did not note any power lines that posed a danger for the flight. While maneuvering at a low altitude during a pass turn, the helicopter struck a wire that he did not see. After the helicopter struck the wire, the helicopter windscreen failed and the helicopter violently shook. The pilot entered an autorotation to the field, and the helicopter impacted terrain and came to rest on its right side. The helicopter sustained substantial damage to the fuselage, tail boom, and main rotor blades. The pilot reported no mechanical failures or malfunctions of the helicopter. The accident was reported to the National Transportation Safety Board on September 11, 2017.