What happened
On August 11, 1972, a pilot was conducting a training flight at the Montricher aerodrome in a K 6 CR glider, registration HB-881. After approximately 16 minutes of flight, the pilot performed several spirals at an altitude of 500 meters northeast of the runway 21 threshold to descend.
As the pilot attempted to enter the final approach, a tug aircraft preparing to land occupied the path, prompting the pilot to yield priority. Consequently, the glider transitioned to the downwind circuit, passing the runway threshold at an estimated altitude of only 40 meters. During the turn toward the final approach, the glider encountered sinking air currents. This loss of lift left the pilot with insufficient altitude to clear a hedge located at the airfield entrance. At 11:26 CEST, the HB-881 struck a bush with its right wing at low speed and crashed to the ground. The pilot sustained no injuries, but the aircraft was destroyed.
The investigation
The investigation examined the pilot's credentials and the technical state of the aircraft. The pilot held a valid glider pilot license with passenger authorization and had a total flight experience of 106 hours, including 15 hours and 32 minutes within the preceding three months. There was no evidence of health issues or prior regulatory infractions.
Technically, the K 6 CR was found to be in airworthy condition and properly registered, with no mechanical failures identified as contributing to the event. Weather conditions were also ruled out as a factor in the accident.