Accident du SHK-1 lors d'un atterrissage en campagne près de Moudon, Suisse, le 16 juin 1967

Moudon, Switzerland Schempp-Hirth SHK-1

Le 16 juin 1967, un Schempp-Hirth SHK-1 a subi un accident lors d'un atterrissage en campagne près de Moudon, en Suisse. Le pilote a tenté de se poser dans un champ après avoir échoué à trouver une ascendance adéquate pendant un vol de championnat national de vol à voile. En déployant les aérofreins et un parachute de freinage, le planeur s'est retourné et s'est écrasé, entraînant des blessures pour le pilote. L'enquête a conclu qu'une entrée de commande rapide combinée à l'utilisation de la gouverne de direction a provoqué le retournement du planeur. Le pilote a été hospitalisé avec une blessure à la tête, tandis que le planeur a subi des dommages importants.

  1. Cross-country approach: During a national championship cross-country task, the pilot, unable to find further lift near Moudon, committed to an off-field landing in a mown pasture aligned 04–22.
  2. High-energy short final: On short final over the chosen field, after crossing a high-tension power line at about 15 m, the pilot deployed the tail braking parachute and extended dive brakes, steepening the glide to roughly 20° at about 120 km/h.
  3. Low height and drag: The flare was initiated only a few meters above ground with both dive brakes and braking parachute deployed, reducing control effectiveness in the boundary layer and making pitch response sluggish.
  4. Abrupt control input: Per flight tests and the pilot’s account, when the glider reacted weakly to initial aft stick during the flare, the pilot pulled the stick rapidly while also applying some rudder to correct heading.
  5. Uncommanded roll and inversion: The combined rapid aft stick and rudder input caused the SHK-1 to yaw and roll left, entering a rapid half-roll to inverted flight with the left wingtip striking the ground.
  6. Crash - minor injury: The glider impacted inverted in the axis of the intended landing field, sustaining substantial damage while the pilot suffered a head laceration requiring hospitalization.
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