Maneuvering and Initial Event
The pilot reported maneuvering the helicopter in a right turn at 200 feet above ground level (AGL) with a ground speed between 20 to 25 knots and a tail wind. During the turn, the helicopter began an uncommanded turn to the right.
Pilot Actions
In response, the pilot immediately applied left anti-torque pedal and increased power. However, the rate of the uncommanded turn increased. The pilot then decreased power, lowered the nose, and applied right cyclic, but the turn rate continued to increase.
Collision
The helicopter descended while turning to the right and collided with trees and a road. The impact collapsed the right skid, and the helicopter rolled over onto its left side.
Pilot Statements
When asked about mechanical problems before the accident, the pilot stated there were none. Asked what happened, the pilot said he encountered a loss of tail rotor effectiveness. Regarding training for such an event, the pilot stated he had only open discussion.