Incidente del Ka 4 Rhönlerche II durante aterrizaje de entrenamiento en el aeródromo de Amlikon
El 7 de abril de 1972, un alumno piloto que volaba un Alexander Schleicher Ka 4 Rhönlerche II experimentó dificultades durante un vuelo de entrenamiento en el aeródromo de Amlikon en Suiza. Durante la aproximación de aterrizaje, el piloto realizó un resbale lateral a la derecha pero tuvo problemas para coordinar los controles al nivelar. La aeronave se desvió del curso y aterrizó en un camino cercano, donde una punta de ala golpeó un arbusto. El planeador sufrió daños significativos, pero el piloto resultó ileso. La investigación atribuyó el incidente al uso inadecuado del timón durante la maniobra de aterrizaje.
- Winch launch training: During a training flight at Amlikon, the student pilot completed a winch launch and began circuit flying for his 14th solo.
- Low pilot experience: The student pilot had a total of 7 hours 47 minutes on type and was known to have occasional difficulty coordinating controls when recovering from a sideslip.
- Landing approach setup: From about 200 m AGL the pilot flew a normal landing pattern, fully extended the airbrakes, and initiated a right sideslip on final.
- Rudder misused in recovery: While recovering from the right sideslip just above the ground, the pilot applied full right rudder instead of coordinating the controls correctly.
- Glider yaws off course: As the aircraft was brought out of the sideslip, it yawed and turned to the right, ending up flying about 45 degrees across the intended landing direction over the river Thur at roughly 80 km/h.
- Decision to land on path: Seeing the glider misaligned and over the river, the pilot elected to land on the track along the right riverbank embankment.
- Outlanding - damage: During the rollout on the embankment track the left wing struck a bush, causing the glider to slew left and sustain serious damage while the pilot remained uninjured.