Incidente Hütter H-28 durante aterrizaje fuera de campo en Eschert tras salida de Spreitenbach, 1 herido en colisión

El 12 de junio de 1965, el piloto planeaba realizar un vuelo de distancia con el planeador Hütter H-28 HB-223 desde Spreitenbach hacia el Chasseral. Durante la aproximación, se encontró con fuertes zonas de descenso, lo que hizo inevitable un aterrizaje fuera de la zona prevista en Eschert BE. Al aterrizar, la aeronave tocó un poste de madera de una línea telefónica, sufriendo daños significativos. El piloto sufrió lesiones leves, mientras que los daños al terreno fueron mínimos. La investigación reveló que el piloto retrasó el momento del aterrizaje y que este no se realizó de manera óptima.

1. Cross-country cruise: The pilot departed Spreitenbach by aerotow for a cross-country flight toward Chasseral and was cruising along the Jura ridges.
2. Extended downdrafts: While attempting to cross from Mont Raimeux toward Montoz, the glider encountered widespread downdrafts of 2–3 m/s that prevented further progress and eroded altitude.
3. Delayed landing decision: After first selecting a landing field near the Moutier–Gänsbrunnen road, the pilot decided not to use it and continued searching for lift without having other clear landing options in sight.
4. Low, slow final approach: On the eventual outlanding approach over built-up and uneven terrain, the pilot flew a shallow glide without airbrake or sideslip, apparently at too low an airspeed while focusing on minimum sink rather than best glide.
5. Late obstacle recognition: Shortly before an orchard at the edge of the chosen field, the pilot only then noticed an additional power line beyond the trees and pushed the nose down at the last moment to gain speed to clear it.
6. Wing strikes telephone mast: During the low approach over the orchard, the left wing struck a 9 m telephone-line mast about 20 cm below its top, breaking the mast and yawing the glider, which then hit the ground with the right wingtip and nose.
7. Crash - minor injury: The glider came to rest about 20 m beyond the mast under a power line with substantial structural damage, while the pilot sustained minor injuries and nearby telephone infrastructure and vegetation were slightly damaged.