Accident Overview
A helicopter was damaged during a forced landing after the pilot experienced an uncommanded right rotation shortly after takeoff. The pilot reported departing from the shoreline of a river into a wind of 2 to 3 miles per hour.
Pilot Report
The pilot stated that when the helicopter reached an altitude of about 100 feet, approximately 100 yards from the shore, and indicating over 50 miles per hour, a slight right turn was initiated. Applying full left pedal input did not stop the right turn. The pilot elected to return to the shore. As he approached a flat area, he felt he would not be able to reach the intended landing area and attempted to turn back toward the river. The left rear skid contacted sloping ground, and the helicopter slid down the slope, coming to rest on its left side.
Examination Findings
Subsequent examination of the helicopter revealed no anomalies. Continuity of the tail rotor drive and control systems was confirmed. A maintenance record entry dated one day prior to the accident indicated that the tailboom had been replaced. However, due to bending of the tail rotor control push-pull tubes from impact forces, determination of proper rigging of the tail rotor could not be made.
Environmental Conditions
The pilot reported unlimited visibility, a temperature of 70 degrees Fahrenheit, and south winds at 2 to 3 miles per hour.