Incident Bocian lors d'une approche brumeuse près de l'aérodrome de Bad Ragaz
Le 27 novembre 1971, un Zaklady SZD-9 bis 1E Bocian a connu un incident près de l'aérodrome de Bad Ragaz en Suisse. Lors d'un vol de contrôle, le planeur a été largué à 160 mètres en raison du brouillard et a tenté de revenir à l'aérodrome. La mauvaise visibilité a conduit à une tentative d'atterrissage en campagne, au cours de laquelle le planeur a heurté le sol après un virage serré à droite pour éviter des obstacles. L'instructeur n'a pas été blessé, tandis que l'élève-pilote a subi des blessures légères. Le planeur a subi des dommages importants, mais il n'y a eu aucun dommage à des tiers.
- 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.