Ka 7 Strömungsabriss beim Anflug auf den Flugplatz Bex führt zu schwerer Verletzung des Piloten

Bex aérodrome LSGB, Switzerland Alexander Schleicher K 7

Am 1. November 1986 geriet ein Alexander Schleicher K 7 Segelflugzeug, das an einem Präzisionslandewettbewerb auf dem Flugplatz Bex teilnahm, während des Endanflugs in einen Strömungsabriss. Der Pilot reduzierte die Geschwindigkeit nach dem Überfliegen einer Baumreihe auf 70 km/h, was zu einem Strömungsabriss aus einer Höhe von 5 bis 10 Metern führte. Das Segelflugzeug kollidierte mit einem Kalb und drehte sich um 120 Grad, bevor es zum Stillstand kam. Der Pilot erlitt schwere Verletzungen, und das Segelflugzeug wurde am Rumpf und am linken Flügel erheblich beschädigt. Der Unfall wurde auf eine unangemessene Anflugtaktik sowie unzureichende Höhe und Geschwindigkeit zurückgeführt.

  1. Final approach: During a precision landing contest flight after aerotow release at 650 m AMSL, the pilot flew a relatively low final approach to runway 33 in the Ka 7.
  2. Low height on approach: Witnesses already observed the glider on base leg at a noticeably lower height than other competitors, contrary to the club’s recommended minimum approach altitudes.
  3. Speed reduced near trees: After turning onto final, the pilot reduced speed from about 90 to 80 km/h, then, concerned about proximity to a tree line 300 m before the runway, retracted airbrakes and further reduced speed to about 70 km/h after passing the trees.
  4. Obstacle avoidance maneuver: On short final, at low height and low speed, the pilot maneuvered to avoid a single isolated tree near the approach path, increasing angle of attack with little speed margin above stall.
  5. Low-level stall: With insufficient speed and height, the glider stalled at an estimated 5–10 m above ground and dropped into a field about 150 m before the runway threshold.
  6. Crash - serious injury: The glider struck a calf with the left wing, rotated about 120 degrees, came to rest with serious damage to the fuselage and left wing, and the pilot was seriously injured.
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