Synopsis
On 8 April 2017, a SZD-55-1 glider (registration G-CKLR) was being towed for launch at Currock Hill Airfield, Northumbria. Shortly after becoming airborne, the glider pitched up steeply, released from the tow rope, rolled to the right, and descended in a nose-down attitude, resulting in extensive damage and fatal injuries to the sole pilot.
History of the Flight
The pilot, a 62-year-old former airline captain with 18,800 flying hours (39 on type), had been modifying the glider's avionics in the preceding two months. On the accident day, he arrived at the airfield around 0830 hrs and rigged the glider with assistance from club members for the wings. He then drove the helpers to the launch point before returning to complete the rigging alone. After positioning the glider for launch, he performed pre-launch checks, including a full-and-free control movement check with the other glider owner. The tow line was attached to the front hook, and the launch commenced.
During the takeoff roll, the tug pilot noticed the glider climbing rapidly above him, then felt the tow rope release. Witnesses saw the glider reach an estimated 100 ft, drop its right wing, and descend nose-first into the ground.
Examination and Investigation
On-site examination revealed that the glider struck the ground in a steep nose-down attitude. The elevator appeared jammed in the fully-up position due to impact damage. Analysis of recorded data showed the glider reached a peak true airspeed of 44 kt and a height of approximately 60 ft at the last data point. A video of the initial takeoff showed evidence of aileron, rudder, and airbrake use but no large elevator deflections.
The investigation determined that the elevator control connection had not been correctly made when the glider was rigged. This condition was not detected prior to the flight, resulting in no effective elevator control. An unapproved modification to the glider significantly increased the opportunity for mis-rigging. As a result, the European Aviation Safety Agency mandated an inspection of similar gliders, and one Safety Recommendation was made.