Incident d'atterrissage en campagne d'un Ka 6 près de Köniz entraîne des dommages importants et une blessure mineure

Le 10 avril 1971, un Alexander Schleicher Ka 6 CR a effectué un atterrissage en campagne près de Köniz, Suisse. Le pilote a tenté d'éviter des obstacles lors de l'atterrissage, ce qui a entraîné le contact d'une extrémité d'aile avec le sol. Le planeur a subi des dommages importants, y compris une aile détruite et un fuselage cassé. Le pilote a subi des blessures mineures. L'enquête a confirmé que la décision d'atterrir a été prise trop tard pour choisir un champ approprié.

1. Aerotow cross-country: The pilot launched by aerotow from Flughafen Bern for a training cross-country flight and climbed to about 1700 m over the northern end of the Längenberg.
2. Flight too far leeward: The pilot flew about 9 km behind the Längenberg ridge toward Schwarzwasserbrücke, entering the lee side where sink prevailed and losing significant altitude.
3. Late landing decision: The decision to abandon the flight and outland was made objectively too late, leaving insufficient time to select and tactically approach a suitable field.
4. Committed to narrow valley: With insufficient height to return, the pilot committed to an outlanding in the narrow, obstacle-filled Gurtentäli valley and aligned along the valley floor.
5. Obstacle avoidance maneuvers: Following the valley, the pilot crossed a 16 kV power line at a shallow angle, then pushed for speed to clear a transverse low-voltage/telephone line and attempted to pull up over it before deciding to pass underneath.
6. Abrupt turn, wingtip strike: To avoid a mast on the left while passing under the line, the pilot made a brusque right turn, causing the right wingtip to catch in the soft field and the left wing to tear through the telephone wires.
7. Crash - minor injury: The glider impacted nose-first, destroying the right wing and breaking the fuselage, while the pilot sustained a minor head injury and nearby telephone lines and ground were slightly damaged.