Big Pine, FL, USA
N173MS
Bell 206
The pilot reported that, after the fourth aerial application flight of the day, he landed and positioned the helicopter near the autoloader boom truck. He reduced engine power to flight idle, and the ground crew began the loading process. He verified that the collective position was full down and the cyclic friction was on, and he then exited the helicopter to stretch while maintaining one hand on the cyclic. The pilot reported that, immediately after, while standing next to the helicopter, he heard two "loud bangs." He immediately boarded the helicopter, the ground crew secured the truck's boom, and the pilot shut down the engine. Examination revealed that a main rotor blade had struck the truck's boom arm and that the main rotor blades sustained substantial damage. The director of aerial operations reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
The helicopter pilot reported that, after the fourth aerial application flight of the day, he landed and positioned the helicopter near the autoloader boom truck. He reduced engine power to flight idle and the ground crew began the loading process. He verified the collective position was full down, set the cyclic friction to ON, and exited the helicopter to stretch while maintaining one hand on the cyclic. Immediately after, while standing next to the helicopter, he heard two "loud bangs." He immediately boarded the helicopter; the ground crew secured the boom, and the pilot shut down the engine. Upon further examination by the operator's maintenance personnel, it was determined that a main rotor blade struck the boom arm and that the main rotor blades were beyond the repair limitations, per the manufacturer's guidance. The helicopter sustained substantial damage to the main rotor blades. The director of aerial operations reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The director of aerial operations added that, at the site of the accident, the wind was 130º at 11 knots, gusting up to 19 knots. The helicopter was oriented with a southbound heading.
The pilot's failure to maintain helicopter control while it was being reloaded with the rotors turning in gusting wind conditions, which resulted in a rotor strike with ground equipment.
Source: NTSB Aviation Accident Database
Aviation Accidents App
In-Depth Access to Aviation Accident Reports
