What happened
On May 18, 2019, at approximately 18:25 LMT, a Stinson 108, registration SP-YCW, was preparing for departure from the Bezmiechowa airfield. The aircraft, carrying a pilot and two passengers, was taxiing after glider operations had concluded. As the pilot began the takeoff roll heading south, a sudden wind gust originating from an approaching thunderstorm caused the aircraft to veer sharply to the left.
In an attempt to maintain the centerline, the pilot applied full rudder and right braking, but the aircraft continued to deviate, turning approximately 40 degrees off course. Recognizing the danger of lifting off near the tree line located to the left of the runway, the pilot decided to abort the takeoff. To avoid the forest, the pilot reduced engine power, leaned the mixture, and applied heavy braking and rudder to execute a tight turn. During this maneuver, the aircraft tilted to the right, the right wingtip struck the ground, and the aircraft subsequently capsized, rolling onto its back near the edge of the woods.
The investigation
The PKBWL investigation examined the meteorological conditions, the aircraft's technical state, and the pilot's decision-making process. The investigation established that the aircraft was fully insured and maintained with all necessary technical documentation. The pilot, an experienced ATPL holder with over 10,000 flight hours, was fully qualified for the flight. The investigation also reviewed the weather data, noting the presence of an approaching storm and rain in the area.
Findings
- The primary cause of the accident was the pilot's decision to proceed with the takeoff while meteorological conditions were deteriorating.
- A contributing factor was the delay in the takeoff, as the pilot had waited for gliders to land before attempting departure amidst approaching bad weather.
- A sudden wind gust from a nearby thunderstorm caused the loss of directional control during the takeoff roll.