ASK-18-Pilot fliegt nach Verlust der Sicherheitsmargen in einen Jurahang

Montagne de Romont, Switzerland Alexander Schleicher ASK 18

Der Pilot einer ASK 18 wurde tödlich verletzt, als das Segelflugzeug gegen einen bewaldeten Jurahang prallte; es wurde zerstört. Das Wrack wurde erst zwei Tage später gefunden. Auf seinem ersten Solo der Saison, nach sieben Monaten Pause, klinkte der Pilot auf ~1000 m aus und flog den Jura entlang nach Osten. Der Aufwind war schwach, als die Südwestlage in Bise drehte, sodass das Höhehalten schwerfiel. Im wechselnden Wind hielt er keine ausreichende Marge bei Fahrt und/oder Geländeabstand und flog in die Bäume; die Fluglage beim Aufprall blieb unklar. Ursache war das Nichteinhalten der Sicherheitsmargen; geringe jüngste Übung trug bei.

  1. Aerotow local flight: The pilot took off from Grenchen by aerotow for a local training flight and released over the Grenchenberg before ridge-flying along the Jura towards the east.
  2. Limited recent soaring: This was the pilot’s first solo glider flight of the season after a 7‑month break from soaring, with only a brief dual check flight 12 days earlier and modest experience on the ASK 18 type.
  3. Marginal ridge conditions: Along the Jura the wind was changing from weak southwesterly to bise with sparse and weak lift on the ridge, making height maintenance difficult.
  4. Insufficient safety margins: While flying near the Jura slope, the pilot did not maintain adequate safety margins in airspeed and/or distance from the terrain under the prevailing variable wind conditions.
  5. Loss of safe flight path: The inadequate margins led either to sink close to the slope or to an unrecognized low-speed, over-banked or stalled condition from which recovery was not possible at that height.
  6. Crash - fatal: The glider impacted a wooded slope on the Montagne de Romont at about 1130 m MSL, was destroyed, and the pilot sustained fatal injuries.
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