Introduction
An accident occurred during an arrival to an uncontrolled airport when a Cessna 172 experienced severe turbulence on final approach at approximately 200 feet above ground level (AGL). The aircraft impacted the ground about 500 feet short of the runway and sustained damage.
Sequence of Events
The pilot was making an approach while following a UH-1 helicopter at a distance of about one-quarter mile. At the time, there was a quartering head wind of approximately 4 knots. While on final approach at an altitude of about 200 feet AGL, the Cessna 172 encountered severe turbulence, and the pilot was unable to maintain controlled flight.
Witness Observations
Witnesses reported that the Cessna went nearly inverted after encountering wake turbulence from the helicopter. The aircraft subsequently impacted the ground about 500 feet short of the runway.
Pilot Statement
The pilot stated that he was not aware that helicopters produce wake turbulence. The Aeronautical Information Manual (AIM) addresses helicopter downwash and rotor vortices.
Additional Information
Wake turbulence from helicopters can be hazardous to following aircraft, especially at low altitudes and close distances. The incident highlights the importance of awareness regarding wake turbulence from all aircraft types.