Cat. 2 investigation report: simplified-format report, adapted to the circumstances of the occurrence and the investigation stakes.
During the towed take-off from runway 05 at Havre Saint-Romain aerodrome and at a height of around 10 metres, the canopy of the glider registered F-CLBG suddenly opened, probably due to it not being correctly locked before take-off.
While the student-pilot attempted to close the canopy, letting go of the stick several times, the glider rose above the tug plane and its speed dropped to approximately 70 km/h. Noticing the glider rise above him during the manoeuvre, the tug pilot decided to release the cable and return to land at the aerodrome via an adapted right-hand circuit. At that time, the glider was at a height of approximately 40 m and continued to climb.
The glider turned left at a height of around 80 m, the student-pilot lost control of the glider which collided with the ground with the cable still attached.
The investigation was unable to determine whether the student-pilot had attempted to make a turn-around to land on the reciprocal QFU or on the intersecting runway.