HBV Diamant Zwischenfall während der Schweizer Segelflugmeisterschaft bei Trimbach

Trimbach, France HBV Diamant

Am 24. Mai 1972 ereignete sich ein Zwischenfall mit einem HBV Diamant in der Nähe von Trimbach, Frankreich, während der Schweizer Segelflugmeisterschaft. Der Pilot, der an einem 145 km Dreiecksrennen teilnahm, hatte Schwierigkeiten, Aufwinde zu finden und entschied sich für eine Außenlandung. Beim Manövrieren zur Landung geriet das Segelflugzeug in einen Strömungsabriss und stürzte ab, was zu schweren Verletzungen des Piloten und zur Zerstörung des Flugzeugs führte. Die Untersuchung bestätigte, dass der Unfall durch das Unterschreiten der Mindestgeschwindigkeit während des Landeeinschlags verursacht wurde.

  1. Cross-country task flight: During a competition cross-country task, the pilot flew the HBV Diamant after aerotow launch from Grenchen and was returning from the first turnpoint.
  2. Unable to find lift: On the return leg near Barmelweid, the pilot had difficulty finding usable updrafts and began losing height.
  3. Continued flight low: Hoping to find lift near Trimbach, the pilot continued south of the Dottenberg toward the southwest, progressively losing more altitude.
  4. Insufficient height for airfield: The remaining altitude became insufficient to reach Olten airfield, forcing the pilot to plan an outlanding on a relatively small, high-grass field near Trimbach.
  5. Outlanding setup: The pilot selected a grass field at Grossfeld, flew two full circles to inspect it, and extended the landing gear to commit to the outlanding.
  6. Stall in landing turn: While turning in a relatively steep right-hand turn onto final approach, the glider’s airspeed dropped below minimum and it abruptly stalled, possibly influenced by strong gusts.
  7. Crash - serious injury: The glider entered a steep dive with about 45° bank and impacted the ground roughly 15 m short of the chosen field, seriously injuring the pilot and destroying the aircraft.
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