What happened
On August 19, 1968, a pilot operating a Ka 8 B glider, registration HB-679, was performing a towed flight at Schänis Airfield. After releasing from the tow cable at approximately 1,000 meters, the pilot returned to the airfield due to poor thermal conditions. During the approach to runway 35, the pilot performed a glide to correct an excessive approach height.
At the edge of the runway, two other gliders were positioned: a Ka 8 B, registration HB-806, was waiting for a tow aircraft, and a Rhönlerche, registration HB-586, was parked perpendicular to the runway. Believing the aircraft was too low following the glide, the pilot of HB-679 decided to land short of the runway and deployed the air brakes. Realizing that landing short would result in a collision with the stationary aircraft, the pilot attempted to retract the brakes and maneuver between the two gliders. However, the loss of altitude was too great. The right wing of HB-679 struck the wing of the parked Rhönlerche, and its left wing struck the HB-806. The impact caused the HB-806 to rotate 90 degrees, while HB-679 struck the ground at a 30-degree angle, resulting in the separation of its left wing. The pilot of HB-679 suffered serious injuries requiring a five-week hospitalization.
The investigation
The investigation was initiated by the Schänis airfield manager. Investigators interviewed witnesses at the scene, including a flight instructor, and interviewed the pilot of HB-679 after his hospitalization. The investigation examined the pilot's flight experience, the airworthiness of the aircraft, and the meteorological conditions, which were found to be clear and calm.
Findings
- The pilot attempted to correct a high approach with a glide, which led to a perceived loss of altitude.
- The decision to land short of the runway was incorrect, as it made a collision during the rollout unavoidable.
- The pilot failed to utilize the available 60-meter wide grass area to the left of the runway to avoid the obstacles.
- Improper corrections during the final approach led to the loss of sufficient altitude to clear the parked aircraft.