Ka 4 Rhönlerche II Strömungsabriss während Windenstart am Flugplatz Schänis bei schlechter Sicht

Schänis Flugplatz (LSZX), Switzerland Alexander Schleicher Ka 4 Rhönlerche II

Am 22. August 1966 erlebte ein Schulungsflug mit einer Alexander Schleicher Ka 4 Rhönlerche II einen Windenstartfehler am Flugplatz Schänis, Schweiz. Während des Starts brach das Sollbruchstück des Schleppseils, was den Flugschüler dazu veranlasste, bei durch Regen eingeschränkter Sicht eine Linkskurve einzuleiten. Das Segelflugzeug überzog aufgrund unzureichender Geschwindigkeit, was zu einem Absturz führte, bei dem die linke Flügelspitze und der Rumpf den Boden trafen. Beide Insassen erlitten leichte Verletzungen, und das Segelflugzeug wurde schwer beschädigt, wobei der Schaden auf 60 % seines Wertes geschätzt wurde.

  1. Winch launch training: During a training flight, the Rhönlerche II began a winch launch from Schänis airfield in rainy conditions.
  2. Weak link failure: During the winch launch, the weak link (Sollbruchstelle) of the towline broke, interrupting the launch.
  3. Rain-reduced visibility: Visibility was strongly impaired by rain, making situational assessment more difficult for the student pilot.
  4. Low-speed left turn: Following the towline break, the student pilot initiated a left turn despite having insufficient airspeed.
  5. Stall over left wing: Because of the inadequate speed in the turn, the glider stalled over the left wing and descended uncontrollably.
  6. Crash - minor injury: The glider struck the ground with its left wingtip and fuselage on the airfield, lightly injuring both occupants and causing heavy damage assessed at 60% of its value.
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