HK 36 TTC tug engine power loss after takeoff; glider released and outlanded

Schänis, Switzerland Schempp-Hirth Discus-2B HK Aircraft HK 36 TTC

Shortly after aerotow takeoff from Schänis, the HK 36 TTC tug experienced engine power loss with strong vibrations. The Discus-2b glider released; the tug pilot made an emergency landing ~1.5 km north of the airfield. Both pilots uninjured; no aircraft damage; slight field damage. The investigation was opened in Sep 2017 and closed in Aug 2022 with no operational, organizational, or systemic safety findings.

  1. Aerotow initial climb: Discus-2b D-9830 on aerotow behind HK 36 TTC HB-2328 (both operated by Alpine Segelflugschule Schänis AG) shortly after takeoff from Schänis (LSZX) at ~14:27 LT.
  2. Tug engine power loss + vibrations: The tug pilot felt the engine lose power and experienced strong vibrations.
  3. Glider releases tow: The glider pilot released from the tow rope.
  4. Tug emergency landing: The tug pilot carried out an emergency landing ~1.5 km north of Schänis airfield.
  5. Glider outlanding; no damage: The glider landed safely off-field. Both aircraft undamaged; slight field damage; no injuries. The investigation was opened on 4 Sep 2017 and closed on 31 Aug 2022 with no operational, organizational, or systemic safety findings.
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