Crash du Pilatus B4 au Schafberg entraîne un décès lors d'un vol d'entraînement

Blinnenhorn, Switzerland Pilatus B4-PC 11AF

Le 15 août 1981, un Pilatus B4-PC 11AF s'est écrasé sur les pentes du Schafberg près du Blinnenhorn, en Suisse. Le pilote avait décollé de l'aérodrome de Münster pour un vol d'entraînement et a perdu le contrôle de l'appareil, entraînant un crash mortel vers 18h55 heure locale. Le planeur a été détruit à l'impact, et le pilote, qui avait une expérience limitée du vol en montagne, a été tué. L'enquête n'a révélé aucun défaut technique préexistant sur l'appareil, et les conditions météorologiques étaient signalées comme bonnes avec des thermiques faibles.

  1. Aerotow training flight: The pilot departed Münster/VS at 1515 local on an aerotow in Pilatus B4 HB-1566 for a solo mountain training flight and released the tow after about ten minutes.
  2. Limited mountain experience: The pilot had low overall glider time and only a brief prior mountain-flying introduction and one earlier solo mountain flight in the accident type.
  3. Weak, irregular thermals: In the accident area around the time of the crash, only weak, somewhat irregular thermals (“Nullschieber”) were present, allowing height to be maintained but not gained.
  4. Entry to spin/spiral: For unknown reasons, the glider entered an uncontrolled right-hand autorotation, observed as a right spin or steep spiral.
  5. Low-altitude rotation: The glider remained in the right-hand spin for about one to one and a half turns without recovery and descended toward the slope.
  6. Crash - fatal: The glider impacted the rocky west slope of the Schafberg at approximately 2560 m, was destroyed, and the pilot was fatally injured.
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