Décrochage du Mucha Standard lors de l'approche à l'aérodrome de Hausen am Albis

Le 28 avril 1968, un planeur Mucha Standard a subi un décrochage lors de la phase d'approche à l'aérodrome de Hausen am Albis en Suisse. Le pilote, qui n'a pas été blessé, a rencontré un autre planeur de manière inattendue pendant l'approche, ce qui l'a conduit à déployer les aérofreins. Cette action a entraîné le décrochage de l'appareil et son impact au sol. Le Mucha Standard a subi des dommages importants, mais aucune blessure n'a été signalée. L'incident a été attribué à l'incapacité du pilote à maintenir la vitesse minimale pendant le dernier virage.

1. Aerotow — landing: After an aerotow launch and local soaring, the pilot returned to Hausen am Albis and flew the standard landing circuit to runway 27.
2. Other glider ahead: While in the crosswind/base leg, the pilot suddenly saw another glider about 80 m directly ahead already established on final approach, which he had not previously noticed.
3. Low speed in circuit: Eyewitnesses reported the Mucha was already flying at minimal airspeed in the base leg, leaving little margin above stall, especially in turns.
4. Airbrakes and tailwind: As he turned right into final to increase spacing from the other glider, the pilot extended the airbrakes and was flying with a slight tailwind component, further increasing stall risk.
5. Stall and recovery attempt: The glider abruptly rolled off over the right wing; the pilot pushed to regain speed and then pulled due to ground proximity, partially recovering bank but not fully arresting the sink.
6. Ground and fence contact: The glider struck a ground undulation with the fuselage and then the left wing contacted an electric livestock fence, yawing the aircraft to the left.
7. Hard landing - damage: The glider came to rest roughly 90 degrees to the approach path on the airfield with the fuselage broken and wing fabric torn, while the pilot was uninjured.