Incidente de Bocian durante aproximación con niebla cerca del aeródromo de Bad Ragaz
El 27 de noviembre de 1971, un Zaklady SZD-9 bis 1E Bocian experimentó un incidente cerca del aeródromo de Bad Ragaz en Suiza. Durante un vuelo de control, el planeador fue liberado del remolque a 160 metros debido a la niebla e intentó regresar al aeródromo. La mala visibilidad llevó a un intento de aterrizaje en campo, durante el cual el planeador colisionó con el suelo tras un giro pronunciado a la derecha para evitar obstáculos. El instructor resultó ileso, mientras que el piloto estudiante sufrió heridas leves. El planeador sufrió daños significativos, pero no hubo daños a terceros.
- Aerotow departure: The instructor and student began a control flight in Bocian HB-719 on aerotow from runway 30 at Bad Ragaz airfield.
- Tow enters fog: At about 160 m AGL the tow combination turned right away from the airfield and entered fog banks, significantly reducing visibility.
- Early tow release: The instructor released the glider from tow with the intention of returning immediately to the airfield due to the poor visibility.
- Field not located: Because of the very poor visibility in fog and diffuse lighting, the crew could not visually locate the airfield and had to plan an outlanding.
- Low-level avoiding turn: Shortly before the off-field landing, the crew flew a steep right turn at low height to avoid obstacles that were recognized very late.
- Wingtip ground contact: During the steep low-level right turn, the right wingtip struck the snow-covered ground, upsetting the glider's attitude.
- Crash - minor injury: The glider impacted the ground hard during the attempted outlanding, heavily damaging the aircraft, slightly injuring the student, and leaving the instructor uninjured.