What happened
The incident occurred immediately following departure from Dübendorf Airport. During the initial climb phase, the aircraft experienced an aerodynamic stall. This loss of lift caused the plane to descend rapidly and impact the ground. The force of the collision resulted in the total destruction of the airframe. The pilot, who was the only person on board, sustained injuries during the event.
Findings
The source material does not provide specific technical findings or a detailed investigation report regarding the root cause of the stall. It confirms that the crash sequence began with a stall shortly after takeoff and that the structural integrity of the aircraft was completely compromised by the impact forces.