Crash d'un Standard Cirrus lors du retour à la base près de Hildisrieden, Suisse

Hildisrieden, Switzerland Schempp-Hirth Standard Cirrus

Le 17 mai 1992, un Schempp-Hirth Standard Cirrus a été impliqué dans un accident près de Hildisrieden, Suisse. Le pilote, en vol d'entraînement après une longue pause, a été remorqué à une altitude de 1050 mètres mais a cru à tort être à 1300 mètres en raison d'un réglage incorrect de l'altimètre. Rencontrant des thermiques faibles et une mauvaise visibilité, le pilote a tenté de retourner à l'aérodrome. Lors d'un virage à basse altitude, le planeur a décroché et s'est écrasé, entraînant des dommages importants à l'appareil et des blessures graves pour le pilote.

  1. Aerotow training flight: The pilot, with very little recent flight training, departed Luzern-Beromünster on an aerotow training flight after an interruption of almost one year.
  2. Altimeter mis-set: The altimeter was incorrectly set to 1040 hPa instead of the actual 1024 hPa QNH, causing it to overread by about 150 m and giving the pilot an overly optimistic impression of his height.
  3. Low altitude near field: After releasing at an actual height of about 1050 m and losing height in weak thermals and poor 4 km visibility with a gusty NE wind, the pilot approached the airfield area and found himself at only about 100 m above ground unable to reach the runway directly.
  4. Turn downwind at low height: Over a small wood near the hamlet of Schopfen, at about 100 m above ground, the pilot initiated a 180° reversal turn into downwind in an attempt to reposition despite the low height and gusty conditions.
  5. Stall in reversal turn: During this low-altitude reversal turn the glider’s airspeed dropped below minimum flying speed, leading to a stall and loss of control.
  6. Crash - serious injury: The glider impacted nose-first at the edge of a field, bounced and rotated 180° before striking tail-first in a meadow, destroying the aircraft and seriously injuring the pilot.
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