Crash du SZD-9 Bocian lors d'un vol d'entraînement près de Dessau entraîne deux décès

Dessau, Germany Zaklady SZD-9 bis 1E Bocian

Le 10 juillet 2001, un Zaklady SZD-9 bis 1E Bocian s'est écrasé lors d'un vol d'entraînement près de Dessau, en Allemagne. Le planeur, piloté par un instructeur expérimenté et un élève, est entré en vrille après avoir été lâché par l'avion remorqueur et a percuté le sol presque verticalement. Les deux occupants ont été mortellement blessés et l'appareil a été détruit. L'enquête a révélé que l'instructeur avait subi une crise cardiaque pendant le vol, ce qui a pu contribuer à l'incapacité de sortir de la vrille. Les conditions météorologiques au moment de l'accident étaient normales, et aucune défaillance technique n'a été trouvée sur le planeur.

  1. Aerotow training flight: A dual instructional flight for PPL-C training in a Bocian glider commenced by aerotow from Dessau with the student in front and the instructor in the rear seat.
  2. Instructor heart disease: The instructor had severe pre-existing coronary artery disease and suffered a fresh extensive myocardial infarction during the flight, likely impairing his ability to supervise and control the glider.
  3. Post-release maneuvering: After tow release at about 450 m and several normal circles, the glider flew in a southeasterly direction with large pitch oscillations and high angles of attack, consistent with stall recognition or similar maneuvers at relatively low height.
  4. Low-altitude spin entry: Approximately 400 m beyond the launch point at 250–300 m altitude, the glider entered a fully developed spin with two to three rotations observed and no visible recovery inputs.
  5. Unrecovered spin descent: The spin continued without effective recovery action, possibly aggravated by the incapacitated instructor and potential partial blockage of the controls.
  6. Crash - fatal: Still in an unrecovered stalled condition, the glider impacted the ground near the airfield at an angle of about 60–70 degrees, fatally injuring both occupants and destroying the aircraft.
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