What happened
On 14 June 2009, a mid-air collision occurred near Drayton, Oxfordshire, involving a Grob G1-15E (Tutor), registration G-BYXR, and a Standard Cirrus Glider, registration G-CKHT. The collision occurred while the Tutor was conducting an Air Experience Flight. Following the impact, the Tutor entered a steep, high-speed dive. The pilot attempted to recover from the dive, but the aircraft's descent continued until the situation necessitated emergency procedures.
The investigation
Investigators examined the flight paths of both aircraft and the physical condition of the wreckage. A significant portion of the inquiry focused on the Tutor's ability to recover from the dive. Testing was conducted to determine if the Quick Release Fitting (QRF) of the cadet's seat could have jammed the control column, restricting its rearward movement. The investigation also reviewed the pilot's medical history and the possibility of sudden incapacitation. Furthermore, the investigation looked into the effectiveness of the canopy jettison mechanism and the level of traffic density in the area, specifically regarding the use of the Lower Airspace Radar Service (LARS) in uncontrolled airspace.
Findings
- The investigation established that the Grob G115E (Tutor) possesses benign spin characteristics and is capable of recovering from a dive even if the control column is partially restricted by a jammed QRF.
- The pilot's medical condition was a significant factor under review, as the investigation explored the risk of sudden incapacitation during the flight.
- The collision occurred in an area of high traffic density, where the presence of intense gliding activity increased the risk of encounter.
- The investigation found that the mid-air collision was the primary event that initiated the sequence of the accident.