What happened
On 4 January 1999, a Schweizer 269C-1, registration G-BXTM, was conducting a training flight at Oxford Airport. The flight involved an instructor and a student pilot, who had just finished three circuits of the airfield. Due to wind gusts estimated between 20 and 30 knots, the instructor decided to terminate the training session.
To return to the landing pad, the instructor attempted a towering takeoff, intending to transition into the wind and cross the runway. As the aircraft climbed through 20 feet, the instructor identified that the engine RPM was dropping below the minimum required limit due to overpitching. In an effort to recover the RPM, the instructor reduced the collective pitch. However, this action coincided with a high sink rate, which the instructor attributed to a momentary lull in the wind.
In an attempt to prevent the aircraft from hitting the ground, the instructor increased the collective pitch, but the Schweizer 269C-1 struck the ground with a heavy vertical force and a slight rearward movement. The impact caused the helicopter to slew and roll onto its right side. There were no fatalities, though the crew sustained minor injuries. Both occupants managed to exit the aircraft, though the student pilot faced some difficulty doing so. No fire occurred following the impact.
The investigation
The investigation was based on the aircraft accident report form provided by the pilot. Investigators examined the sequence of control inputs and the environmental conditions, specifically the high wind gusts present at the time of the accident. The investigation focused on the interaction between the pilot's corrective actions regarding engine RPM and the resulting loss of altitude.