Accident Overview
On 26 May 1969, a Schleicher Ka 6 glider, registered HB-691, was involved in an accident near Büren a.A. in Switzerland. The aircraft was participating in a competitive flight as part of a training selection camp.
Sequence of Events
During the flight, the pilot decided too late to execute an outlanding. While attempting the maneuver, the glider entered a low-altitude turn. The aircraft stalled and subsequently spun, leading to the accident.
Findings
According to the official investigation, the cause of the accident was the pilot's delayed decision to perform an outlanding, which resulted in a stall and spin in a low-altitude turn. No other factors were identified.
(Note: The source does not specify injuries, damage, weather conditions, or other contextual details.)