Incident Details
A private pilot and a flight instructor were operating a single-engine helicopter on a training flight. They departed from Runway 16 and climbed to 300 feet before initiating a left-hand turn.
Flight Sequence
During the turn, both pilots reported that the nose of the helicopter made an uncommanded yaw to the left. Simultaneously, the low-rotor RPM horn sounded and the caution light illuminated.
Emergency Response
The flight instructor immediately took control of the helicopter. He lowered the collective, "rolled on the throttle," and applied right anti-torque pedal to counteract the left yaw. When the helicopter was approximately 20 to 40 feet above the ground, the instructor executed an autorotation to a sugarcane field, landing perpendicular to the rows.
Post-Accident Examination
Upon landing, the front skids dug into a row, causing the helicopter to roll onto its side. The tailboom and left skid separated from the airframe. Examination of the helicopter and engine revealed no pre-mishap deficiencies or anomalies.
Weather Conditions
Weather reported at the airport included wind from 210 degrees at 10 knots, visibility of 10 statute miles, and a few clouds at 1,500 feet.