Accident Overview
On 28 September 2013, at 13:25 UTC, an Antonov AN-2 (registration OM-PYB) collided with a parked Zephyr 2000 ultralight (registration OK-HUG 06) on the ground at the SLZ Bojkovice aerodrome. The incident occurred during the 4th edition of the air show titled "AVIATIK ŠOU 2013." No injuries were reported, and only the ultralight sustained significant damage.
Aircraft and Pilot Information
The AN-2 is a single-engine, metal-and-fabric biplane with a tailwheel undercarriage, manufactured by Antonov (Ukraine) in 1961. It had a total flight time of 7,185 hours and a valid airworthiness certificate until May 2014. The pilot was a 64-year-old male holding a valid CPL (A) license with SEP (L) and Z 137T ratings, and a valid first-class medical certificate with VML limitation. His total flight experience was 7,193 hours 15 minutes.
The Zephyr 2000 ultralight is a two-seat, single-engine low-wing aircraft with mixed wood-composite construction, manufactured by ATEC, v.o.s., in 2002. It had a valid airworthiness certificate and insurance. The ultralight was parked on the designated parking area.
Sequence of Events
The ultralight had landed in the morning and was parked by the organizer. The AN-2 departed from Dubnica (Slovakia) at 11:15, landed at Bojkovice after about 15 minutes, and performed an aerial display as scheduled. At 13:10, the AN-2 took off again for a display and landed on runway 07 after 15 minutes of local flight. After landing, the pilot continued taxiing in the landing direction, then turned left approximately 90° to exit the runway, proceeded straight, then turned right about 30°, followed by a 180° left turn to reach the assigned parking spot.
The pilot stated he was taxiing to the same parking position as before, guided by the organizer and radio instructions. To execute the turn smoothly, he had to increase engine power. After completing the 180° turn, he saw the ultralight overturned to its right. The pilot noted that the ground was soggy (rozmoklá).
A witness reported that the AN-2 taxied past the parked ultralight, and the propeller blast from the increased power, at a distance of about 30 meters, caused the ultralight to lift and overturn, coming to rest inverted.
Damage Assessment
The ultralight sustained substantial damage: the right wingtip was damaged; the left wing showed no visible damage. The fuselage laminate shell behind the cockpit had cracks, the cockpit frame was broken, and the canopy (plexiglass) was shattered. The left stabilizer attachment was torn out, the right horizontal stabilizer tip was damaged. One propeller blade was broken, the spinner was damaged, and the upper engine cowling was deformed. The engine mount showed no visible deformation, and the engine and its installation were undamaged.
Regulatory Context
The investigation referenced aviation regulations L 2 (Rules of the Air) Section 3.1 regarding careless or reckless operation endangering persons or property, and national laws on public air displays. The event was a public air display requiring approval; conditions for such events include procedures for parking and ground movements.
Probable Cause
The investigation did not state a probable cause in the provided text.