Ka 8 sackt bei zu langsamer, tiefer Hangkurve in Bäume

Veysonnaz, Switzerland Alexander Schleicher Ka 8 B

Ein Flugschüler flog auf seinem letzten Alleinflug vor der Prüfung eine Ka 8 B bei Veysonnaz zu langsam und sank in Bäume; er blieb unverletzt, das Segelflugzeug wurde stark beschädigt. Mit erst 12 Flugstunden war er den Hang zuvor im Doppelsitzer geflogen. Er wich Gleitschirmen zum schwächeren Aufwind am Wald aus. Im Geradeausflug hob eine Böe die rechte Fläche; bereits zu langsam, wurde die Maschine schwer steuerbar, und eine tiefe Kurve zum Hang nahm Fahrt weg, bis sie in die Wipfel sackte. Das Ausweichmanöver war nicht direkt ursächlich; Ursache waren zu geringe Fahrt im Geradeausflug und eine zu tief und langsam geflogene Hangkurve.

  1. Ridge soaring flight: After an earlier dual instructional ridge-soaring flight, the student pilot launched by aerotow from Sion for a solo ridge-soaring gain-of-height flight in the Ka-8b.
  2. Avoiding paragliders: While soaring near Veysonnaz, the pilot observed several paragliders and moved away from their area toward the forested slope where the lift was weaker.
  3. Low airspeed near slope: During straight flight on about the fifth pass parallel to the slope, the glider was already flying at too low an airspeed, reducing control margin close to terrain.
  4. Gust upsets glider: A strong gust suddenly lifted the right wing during straight flight along the slope, abruptly upsetting the glider's attitude.
  5. Ineffective control inputs: The pilot applied full right aileron, full forward stick, and full right rudder but the glider continued to sink and remained difficult to control.
  6. Low, slow turn into slope: The pilot then reversed to left stick and turned toward the slope to execute a 180° turn, during which the airspeed decreased further before he attempted to pitch up to clear the treetops.
  7. Crash - no injury: The very slow glider struck the tops of the trees, was abruptly stopped and then tipped forward to hang vertically between trees, heavily damaging the aircraft while the pilot remained uninjured.
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