Accident Description
A certified flight instructor (CFI) reported that he initiated a climbing right turn immediately after lifting off in a helicopter. According to the CFI, the helicopter was approximately 10 to 15 feet above the ground when he perceived a loss of power and a tendency for the aircraft to yaw to the left. He stated, "...it felt like the helicopter lost power and tried to yaw towards the left....I tried to get it back on the ground as quickly and safely as I could." The CFI indicated that he overcompensated for a perceived upward pressure on the collective control, resulting in the helicopter impacting the ground abruptly.
Weather and Environmental Conditions
Meteorological conditions at the time of the accident were conducive to moderate carburetor icing. The student pilot, who was observing from the ground, reported that the CFI had made several adjustments to the carburetor heat during a previous flight.
Examination Findings
A post-accident examination of the helicopter revealed no evidence of any pre-impact mechanical malfunction. The examination did not identify any issues with the airframe, engine, or systems that would have contributed to the event.
Official Determination
The accident investigation source did not assign a probable cause for the accident.