ASK 23 überzieht in Hangwind-Scherung und landet in den Baumwipfeln
Ein im Hangflug wenig erfahrener Pilot unterschritt an der Hasenmatt mit einer ASK 23 die Überziehgeschwindigkeit, sackte in die Bäume und rutschte zu Boden; das Segelflugzeug wurde zerstört, der Pilot blieb unverletzt. In turbulenter Hangströmung flog er 8er-Schlaufen, drehte 180° vom Hang weg und sofort zurück, und die Fahrt brach auf 50 km/h zusammen. Die hintere Schwerpunktlage verringerte die Längsstabilität und machte die Steuerung empfindlicher; in der Scherung reichte eine 10-kt-Böe bis zum Abriss. Er entschied sich für die Baumlandung. Faktoren: zu geringe Fahrtreserve, sehr geringe Hangerfahrung, hintere Schwerpunktlage.
- Ridge training flight: During the second afternoon training flight after aerotow to 2,000 m, the pilot flew ridge soaring along the Hasenmatt between about 1,200 and 1,300 m, in short figure-eight patterns.
- Low ridge experience: The pilot had very limited overall gliding experience and only a brief prior ridge-flying checkout, so he was not familiar with windshear hazards in ridge soaring.
- Aft CG and turbulence: The glider was loaded with the centre of gravity aft in the allowable range, reducing stability, over ridge terrain known for turbulent airflow with only weak lift.
- Turn away from slope: While flying figure-eights along the ridge, the pilot made a 180° left turn away from the slope and then immediately turned right, during which airspeed dropped rapidly below minimum.
- Stall and height loss: The glider entered a mush/stall with airspeed reported down to about 50 km/h, losing height quickly despite the pilot applying full control inputs to turn right and away from the slope.
- Emergency landing attempt: Recognizing that he could not regain sufficient airspeed or control, the pilot committed to an emergency landing and extended the airbrakes.
- Crash - no injury: The glider touched down in treetops on the slope, slid down the trees to the ground, was destroyed, and the pilot exited uninjured.