What happened
On June 5, 2022, at 18:06 local time, a PZL 101/A Gawron, registration HA-SBG, was performing a glider towing flight at Farkashegy airfield (LHFH). During the landing roll, the aircraft landed slightly diagonally across the runway due to crosswind conditions. As the aircraft decelerated, it turned over and came to rest upside down on the runway. The pilot sustained minor injuries, likely caused by sliding from the seat and striking their head against the cockpit interior due to the lack of a shoulder harness.
The investigation
The investigation examined the mechanical and operational factors leading to the aircraft's overturn. Investigators analyzed the aircraft's center of gravity, the functionality of the air brake, and the pilot's landing technique. The inquiry established that the pilot, while experienced in general flight, lacked specific experience with this particular aircraft type and its braking system. The investigation also looked into the impact of the landing direction and the runway length remaining after the off-track touchdown.
Findings
- The direct cause of the incident was the excessive braking force applied by the pilot to stop the aircraft.
- The aircraft's high and relatively forward center of gravity made it prone to rolling over during intensive braking at high speeds.
- The dynamic operation of the air brake, which involves a delay due to air compressibility, contributed to the sudden application of force.
- The pilot's landing direction, necessitated by crosswinds, effectively shortened the usable runway, potentially causing the pilot to feel they were running off the runway.
- The pilot's limited experience with this specific aircraft type and its brake characteristics was a contributing factor.