What happened
On 30 August 2006, a Slingsby T.51 Dart 15 glider, registration BGA116 and 6, was participating in a local flight at the Sutton Bank gliding site in Yorkshire. The flight, which was originally intended to be a cross-country mission, had been downgraded to a local flight due to weather conditions. During the later stages of the flight, the aircraft was observed flying at an unusually low height and slow speed along the ridge line.
Witnesses noted that the glider appeared to be descending towards the ground while traversing the ridge. The pilot attempted a turn to the right, presumably in an effort to return to the airfield. During this manoeuvre, the aircraft experienced a rapid right-hand roll and the nose pitched downward. The glider entered a state of uncontrolled flight, appearing to enter a spin, and crashed into trees on a steep slope approximately 50 feet below the ridge line. The pilot sustained fatal injuries.
The investigation
Investigators examined the wreckage of the BGA1166 and recovered two cameras from the cockpit. Digital photographic evidence revealed that the pilot had been taking aerial photographs of other gliders during the flight, which may have served as a distraction. The airspeed indicator was tested and found to be functioning correctly, with readings within 2 knots of calibrated values.
An engineering inspection of the flight controls, including the ailerons, rudder, and airbrake systems, showed no evidence of mechanical failure or pre-accident jams. While some corrosion was noted on the wing root bolts, it was not considered a contributing factor. The investigation also reviewed the pilot's flying experience and the site's operational procedures.
Findings
- The aircraft was flying at a very low airspeed and height, likely near its stalling threshold.
- The pilot may have been distracted by the task of taking aerial photographs during the flight.
- The loss of control was likely caused by excessive rudder input during a low-speed turn, which induced a stall of the inner wing.
- The pilot's attempt to turn back toward the airfield occurred at an altitude that left insufficient margin for recovery once the aircraft departed from controlled flight.
Safety action
Following the accident, the local club implemented Standard Operating Procedures (SOPs) to ensure all pilots are formally briefed on site-specific requirements and safety protocols.