19971115033039A

Wind gust turned helicopter. R22 began uncontrollable right turn. Hit a fence. Rolled over. Chopped tailboom. (.4)the student pilot reported that he had established an out-of-ground-effect hover at 200 feet AGL. He further reported that, the 'wind turned the ship to the right abruptly,' to a westerly heading. To correct, he applied left pedal, 'but not enough' and the helicopter began 'to lose altitude and control,' so he released pressure on the left pedal, thinking he had compensated incorrectly. As the helicopter continued turning to the right, he began to apply left pedal. As the helicopter kept turning to the right, the pilot applied full left pedal. The descent continued, and the helicopter completed another 360 degree turn and contacted a fence. The pilot estimated the winds were from 010 degrees at 8 knots. No control system anomaly was found. Performance charts indicated that the helicopter was within it's flight envelope during the hover. (-23) at approximately 150' AGL, while attempting a RH pedal turn into a resulting low altitude hover, the pilot experienced a slight loss in tail rot or effectiveness due an 8 knot quartering RH tailwind and failed to apply sufficient LH anti-torque pedal pressure which caused the helicopter to continue in a perpetual RH turn. The pilot also failed to maintain sufficient aft cyclic input, so the aircraft rapidly descended until it impacted a tubular steel and chain link fence and terrain.