Grunau Baby III Strömungsabriss während Landeanflug in St. Gallen-Altenrhein, Pilot verletzt

St.Gallen-Altenrhein Flughafen (LSZR), Switzerland Edmund Schneider Grunau Baby III

Am 3. August 1961 war ein Grunau Baby III in einen Unfall am Flughafen St. Gallen-Altenrhein in der Schweiz verwickelt. Während eines Übungsflugs leitete der Flugschüler einen Landeanflug ein und ging in einen Linksseitengleitflug über. Das Segelflugzeug erlitt in etwa 40 Metern Höhe einen Strömungsabriss und ging in einen Trudeln über, das nach anderthalb Umdrehungen auf dem Boden aufschlug. Der Pilot erlitt schwere Verletzungen und das Segelflugzeug wurde stark beschädigt. Die Untersuchung ergab, dass der Unfall wahrscheinlich durch einen Strömungsabriss während des Gleitflugs verursacht wurde.

  1. Winch launch circuit: During a training flight the student pilot winch-launched from Altenrhein grass runway 28 and flew a standard left-hand circuit for landing.
  2. Tendency to fly slow: On two prior flights that day the instructor had observed the student’s tendency to fly at too low an airspeed on approach.
  3. Low approach altitude: The student turned onto final at about 80 m above ground, leaving limited height margin for correcting errors on approach.
  4. Improper slip initiation: While slightly right of the intended final path, the student attempted to initiate a left slip from a shallow angled approach using right rudder followed by left aileron instead of the recommended aileron-then-rudder sequence.
  5. Stall and spin entry: At about 40 m above ground the glider’s airspeed dropped below stall speed during the slip entry, causing it to drop over the right wing and enter a right spin.
  6. Crash - serious injury: After about one and a half turns of spin the glider impacted the ground roughly 20 m right of the runway centerline and 500 m before the threshold, seriously injuring the pilot and heavily damaging the aircraft.
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