What happened
On August 4, 1976, a pilot was conducting a training flight at the Montricher aerodrome. After a tow takeoff, the pilot searched for thermals but, finding none, decided to conclude the flight. While performing the landing circuit for runway 21, the pilot flew at a low airspeed and low altitude. During the base turn, the SZD-8bis Jaskolka, registration HB-581, entered a stall and subsequently a spin. The aircraft struck the ground in a near-vertical position in a harvested wheat field. The impact resulted in the death of the pilot and the total destruction of the aircraft.
The investigation
The investigation examined the flight sequence, the pilot's experience, the aircraft's technical condition, and the meteorological environment. Witnesses on the ground observed the glider performing a turn with a significant lateral tilt and a slow cadence, suggesting a loss of control. Technical analysis of the wreckage showed the airbrakes were extended, though it was determined they likely deployed upon impact rather than being manually deployed by the pilot. The investigation also reviewed the pilot's medical fitness and flight records, noting that the pilot was fully licensed and had recently completed training on this specific type. Meteorological data indicated a northwesterly wind (joran) with gusts of up to 30 knots, creating moderate to strong turbulence.
Findings
- The primary cause of the accident was a loss of airspeed during an approach that lacked sufficient reserves of both speed and altitude.
- The pilot's experience with the SZD-8bis Jaskolka was relatively limited.
- Gusty wind conditions (joran) likely contributed to the loss of airspeed during the maneuver.
- The aircraft's weight and center of gravity were within prescribed limits, and no pre-existing mechanical defects were identified.