What happened
On July 19, 2017, during the Czech Junior Glider Championship, a VSO-10 glider, registration OK-1500, was participating in a competitive cross-country flight. While flying through the second sector of the course, the pilot encountered approaching thunderstorms and heavy precipitation. Due to the deteriorating weather conditions and the aircraft's altitude, the pilot made the decision to terminate the competition flight and perform a safety landing in a field.
After selecting an initial landing site, the pilot attempted a landing into the wind. However, during the fourth circuit, the aircraft entered turbulent air. A strong wind gust lifted the glider, causing an unplanned increase in altitude and negatively affecting the planned landing distance. Realizing the original field was no longer suitable, the pilot opted to extend the approach to a second field. This subsequent field was bounded on its western edge by a road with an elevated embankment. During the final phase of the landing, the glider lacked sufficient energy and airspeed to clear the obstacle. The aircraft struck the embankment, bounced, and came to rest in a field of tall potato plants.
The investigation
The ÚZPLN investigation examined the flight data, meteorological reports, and the physical condition of the aircraft. The investigation confirmed that the pilot was properly licensed and the aircraft was airworthy. Investigators analyzed the impact of the local weather, which included convective clouds (Cb) and thunderstorms, on the aircraft's flight path. The inspection of the VSO-10 revealed extensive structural damage, including the loss of structural integrity in the forward and tail sections of the fuselage, damage to the cockpit canopy, and the tearing of the keel from the fuselage.