What happened
On June 17, 2020, at approximately 17:40, a pilot prepared for a firefighting mission departing from the Leśna Baza Lotnicza in Lipki Wieladamente. The aircraft, an M-18B Dromader with registration SP-FFH, had undergone a successful pre-flight inspection and engine ground run, with all parameters remaining within normal limits.
During the takeoff roll, the pilot attempted to rotate the aircraft by applying back pressure on the control column while maintaining full power and a small propeller pitch adjustment. However, the aircraft failed to lift its tail wheel and instead bounced on the main landing gear. After a second bounce, the aircraft reached approximately two-thirds of the runway length at a speed near stall. The pilot then decided to abort the takeoff.
Upon reducing power, the aircraft settled onto all three landing gear points. The pilot applied heavy braking; however, the significant weight of the water payload severely reduced braking effectiveness. In an attempt to avoid the airport perimeter fence, the pilot executed a sharp right turn. Due to the dry grass surface, the tires lost traction, leading to a skid and a collision with the metal post and mesh fencing. The pilot exited the cabin without injuries, and no fire occurred.
The investigation
The PKBWL examined the sequence of events following the aborted takeoff, focusing on the aircraft's performance under load and the environmental conditions at the time of the incident. The investigation reviewed the pilot's actions during the rotation attempt and the subsequent braking phase on the runway surface.
Findings
- The primary cause of the incident was the failure to follow the water dumping procedure after deciding to abort the takeoff.
- The pilot had limited experience on the M-18B Dromader, with approximately 80 flight hours recorded.
- High ambient temperatures (28°C) on the day of the event negatively impacted the aircraft's performance.
- The heavy weight of the water payload significantly diminished the effectiveness of the braking system.
- Dry grass conditions contributed to tire slippage during the emergency maneuver.