Collision d'un Astir CS avec un arbre lors d'un vol de crête près d'Olten, Suisse
Le 10 juillet 1982, un Grob Astir CS a été impliqué dans un incident près de Born bei Olten, Suisse, lors d'un vol d'entraînement privé. Le planeur est entré en collision avec un arbre en volant près de la crête, ce qui a endommagé une aile. Cela a entraîné une perte de contrôle et un crash subséquent dans une zone boisée. Le pilote a subi de graves blessures, notamment des lésions des tissus mous du visage, une fracture complexe de la jambe et une commotion cérébrale. Le planeur a été détruit lors de l'incident.
- Winch launch ridge flight: The pilot winch-launched the Astir CS from Olten and proceeded to fly ridge-soaring along the Born crest in weakening lift conditions.
- Weakening ridge lift: Around 1900 local time the ridge lift at Born was abating, making it difficult for gliders to maintain or exceed crest height according to other pilots.
- Low height near ridge: Witnesses observed the accident glider flying relatively low along the Born slope, with limited clearance above the trees.
- Collision with tree: While ridge-soaring close to the slope, the glider likely struck a tree, as suggested by a freshly broken treetop found above the accident site and subsequent wing damage.
- Wing damage loss of control: After the impact, witnesses saw one wingtip hanging down, indicating structural damage that led to loss of roll control and the onset of a spinning or rotating descent.
- Crash - serious injury: The uncontrollable glider descended in a turning motion into the forest near Borngrube, was destroyed, and the pilot sustained serious injuries including facial soft tissue damage, a complex leg fracture, and a concussion.