Collision du Ka-8B avec un arbre lors de l'approche à Saanen par mauvais temps

Saanen, Switzerland Alexander Schleicher K 8 B

Le 5 juillet 1972, un vol d'entraînement en solo dans un Alexander Schleicher Ka-8B s'est terminé par une collision avec un arbre près de Saanen, en Suisse. Le pilote, qui avait une expérience de vol limitée, retournait à l'aérodrome lorsque des conditions météorologiques défavorables, y compris la pluie et de fortes rafales, ont affecté la visibilité et le contrôle. La queue du planeur a heurté des lignes électriques avant de se coincer dans un arbre. Le pilote est resté indemne, mais l'appareil a subi des dommages importants. L'incident a été attribué à l'incapacité du pilote à rétracter les aérofreins et à son expérience limitée dans des conditions alpines.

  1. Aerotow local soaring: The pilot departed Saanen by aerotow in a Ka-8B for a first solo training flight in the area and released near Hornberg to soar locally.
  2. Deteriorating weather: Showers and thunderstorms developed with rain, cloud build-up, and increasingly strong, variable winds in the Saanen area.
  3. Low pilot experience: The pilot had limited total flight time and relatively little experience on type and in alpine soaring conditions.
  4. Late decision to return: Despite the worsening weather, the pilot decided relatively late to break off the flight and return to Saanen from about 2300 m altitude.
  5. High-speed descent with brakes: During the descent toward Saanen the pilot flew at about 130 km/h with airbrakes extended, experiencing rain and strong turbulence.
  6. Forgot to retract airbrakes: While turning right onto final for runway 26 in turbulent, rain-reduced conditions, the pilot, distracted by the gusts and visibility issues, forgot to retract the airbrakes.
  7. Crash - no injury: On short final the glider’s tail struck the Montreux–Oberland railway overhead line and the aircraft came to rest heavily damaged in a tree about 3 m above ground, with the pilot uninjured.
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