Primary finding
Probable cause
The pilot's failure to maintain adequate rotor rpm during a low-altitude maneuvering flight.
Investigator assessment
Analysis narrative
According to the pilot, during an aerial application flight, the helicopter pilot was flying between 6 and 7 feet above the ground, at an airspeed of 20 knots. While maneuvering, the pilot encountered a low rotor rpm situation and the helicopter started to settle. As soon as the helicopter descended, the landing skid became tangled in the rice plants, and the helicopter came to rest on its side. During the collision with terrain, the tail boom and main rotor separated from the fuselage. An examination of the helicopter and its systems revealed no preimpact mechanical failures or malfunctions.
Source record
Factual narrative
The helicopter pilot was flying between six and seven feet above the ground, at an airspeed of 20 knots, over a field of rice to cross-pollinate the crop. The pilot stated that he encountered a low rotor rpm situation and the helicopter started to settle. As soon as the helicopter descended, the landing skid became tangled in the rice plants, the helicopter impacted the rice field, and came to rest on its side. During the collision with terrain, the tail boom and main rotor separated from the fuselage. An examination of the helicopter and its systems, conducted by a Federal Aviation Administration inspector, revealed no preimpact mechanical failures or malfunctions.