Primary finding
Probable cause
The passenger's inadvertent interference with the flight controls, which resulted in a loss of directional control and subsequent impact with the ground.
Investigator assessment
Analysis narrative
As the helicopter climbed to about 15-20 feet during a hover, the pilot felt that "something was pushing the helicopter." Shortly thereafter, the helicopter began to descend and the rotor RPM began to decrease. The pilot initiated a precautionary landing, during which the passenger inadvertently pushed on the rudder pedals. The pilot was unable to maintain directional control, and the helicopter rolled onto its side as it touched down.
Source record
Factual narrative
As the Bell 47G-2 climbed to about 15-20 feet during a hover, the pilot felt that "something was pushing the helicopter." Shortly thereafter, the helicopter began to descend and the rotor RPM began to decrease. The pilot initiated a precautionary landing, during which the passenger inadvertently pushed on the rudder pedals. The pilot was unable to maintain directional control, and the helicopter rolled onto its side as it touched down.