What happened
On August 10, 2013, at approximately 14:58 UTC, a Corsair UL (registration OK-SUR 11) crashed at the Holešov model airfield during the "Čmelák Holešov 2013" event. The pilot had arrived earlier in the day, performing several low-altitude passes and maneuvers over the airfield. After parking for approximately 1.5 hours, the pilot took off again, intending to perform a flyover as previously agreed with event organizers.
However, instead of following the agreed-upon departure procedure, the pilot initiated an unplanned and aggressive maneuver. After takeoff, the aircraft entered a steep right turn that transitioned into a descent, reaching maximum speed. The pilot then executed a sharp turn back toward the airfield area. During this phase, the aircraft entered a left-hand climbing turn with increasing bank angle. As the aircraft reached its minimum speed at the peak of the climb, it entered a steep left-hand spiral. The aircraft struck the ground in a steep bank, causing an immediate impact and subsequent fire that destroyed the aircraft. The pilot sustained fatal injuries and died at the scene.
The investigation
way The ÚZPLN investigation utilized GPS data from a Garmin GPSMAP 296, witness testimonies, and video footage from event attendees. The investigation examined the pilot's qualifications, the aircraft's technical condition, and the sequence of maneuvers. Investigators confirmed that the aircraft was in a valid technical state and that the engine remained functional until the moment of impact. The investigation also reviewed the pilot's flight experience, noting that while the pilot held a valid ultralight license, they had very limited experience with this specific aircraft type and minimal experience in aerobatic flight.
Findings
- The primary cause of the accident was improper piloting and a failure to respect the operational limitations of the ultralight aircraft.
- The pilot performed unauthorized aerobatic maneuvers that were inconsistent with the agreed-upon flight plan.
- The pilot's maneuvers were conducted at an altitude of less than 300 ft AGL over a crowd, violating safety regulations.
- The pilot overestimated their abilities and failed to maintain control of the aircraft during high-stress, low-speed flight regimes.
- The pilot's actions were characterized by experimental flight behavior rather than a planned, professional display.
- The aircraft's technical condition was not a contributing factor, as no mechanical failures were identified.