What happened
On May 27, 2017, a pilot was performing a winch launch flight at Kunovice Airport. After completing the launch and encountering some upward currents, the pilot proceeded with the landing approach on runway 02L. During the landing roll, the main landing gear struck a depression in the runway surface, causing the L 33 SÓLO to bounce to a height of approximately 1 to 2 meters.
In an attempt to arrest the bounce, the pilot applied energetic downward pressure on the control stick. This forceful correction caused the aircraft to nose into the ground, resulting in a second impact and a subsequent bounce. The pilot eventually stabilized the aircraft and completed the landing on the grass area. Upon inspection, the aircraft showed structural damage, including deformation of the lower fuselage, a buckled skin under the tail, and damage to the nose and keel.
The investigation
The ÚZPLN investigation examined the pilot's flight experience, the meteorological conditions, and the mechanical state of the aircraft. The investigation established that the pilot had completed several successful flights earlier that day and was sufficiently experienced for the task. Meteorological conditions were clear and favorable for flight. The investigation also reviewed the aircraft's maintenance records, which showed all certifications were valid.
Findings
- The pilot closed the air brakes shortly before touchdown, which increased the aircraft's speed and intensified the ground effect.
- The initial bounce was triggered by the main gear hitting a runway irregularity.
- The pilot's reaction to the first bounce—applying excessive downward pressure on the control stick—was disproportionate to the height of the bounce and the aircraft's speed.
- The subsequent nose-first impact was a direct result of this improper recovery technique.