What happened
On 28 May 2005, a Schweizer 269C, registration G-HFLA, was conducting a training flight in the vicinity of Norwich Airport. During the flight, the instructor decided to perform a demonstration of an engine-off landing on the grass area of Runway 22. At the time, weather conditions were clear, though surface winds were reported as gusty from 230 degrees at 23 knots.
The instructor initiated an autorotation at 1,300 feet above ground level. Once it was determined that the intended landing area could be reached, the throttle was fully closed at 50 and 500 feet above ground level. At approximately 200 feet, the instructor verified a target airspeed of 55 knots and a rotor speed of 490 RPM. To complete the maneuver, the instructor performed a shallow flare due to the wind velocity, leveling the aircraft and attempting to cushion the touchdown using the collective.
However, the aircraft struck the ground with significant force. The helicopter slid approximately 10 to 15 metres forward before coming to a halt. The impact resulted in substantial damage to the aircraft. Both crew members were wearing four-point harnesses and exited the aircraft without assistance; one crew member sustained minor injuries.
The investigation
The investigation was based on the aircraft accident report submitted by the pilot. Investigators examined the flight parameters and environmental conditions at the time of the incident. The investigation noted that the wind was notably gusty, which was a relevant factor during the low-altitude phase of the maneuver. The short distance of the ground slide following the impact suggested that the aircraft may have had a low forward speed at the moment of touchdown.