What happened
On May 8, 2012, at Kolín Airport (LKKO), an L-13 SW Vivat, registration OK-7104, was preparing for a planned cross-country flight. During the initial stages of the takeoff roll, the aircraft's main wheel became stuck in a depression on the aerodrome surface.
To assist with the departure, the pilot requested help from a ground assistant. The assistant pushed the aircraft from behind the tailwheel to help it clear the uneven surface. As the aircraft began to move, the pilot maintained significant power to prevent the wheel from sinking again. The assistant moved toward the wing to clear the aircraft's path but was unable to move out of the way in time. The left side of the aircraft's horizontal stabilizer struck the assistant.
Despite the impact, the pilot continued the takeoff roll and successfully became airborne. The pilot noted a loud thud during the roll, which they initially attributed to the skid hitting the surface irregularity. Shortly after climbing to 300 meters AGL, the pilot was instructed by the AFIS controller to return to the airport.
The investigation
The ÚZPLN investigation established that the ground assistant observed unusual movements on the horizontal stabilizer as the aircraft took off. The assistant immediately reported this observation to the tower. Upon inspection of the aircraft following its return and landing, investigators found that the stabilizer hinge had been damaged.
Findings
- The pilot was qualified and held a valid medical certificate.
- The aircraft was airworthy and maintained a valid certificate of airworthiness.
- The collision between the aircraft and the ground assistant during the takeoff roll caused the structural damage.
- The damage was specifically located at the stabilizer hinge.
- The aircraft was returned to service following necessary repairs by a maintenance organization.