What happened
On March 23, 2019, a recreational flight departed from Wola Krakowiańska with the intention of landing in Wilga and continuing to Dobieszyn. The flight involved a F-JBEW, a J-RO 914 gyrocopter, operated by a private user.
During the initial climb, the pilot set the propeller RPM to 5700. However, upon reaching an altitude of approximately 40 meters, the pilot reduced the propeller RPM to 5100. Shortly after, at an altitude of about 50 meters and a speed of 80 km/h, the pilot noticed that the aircraft was failing to accelerate or climb. In an attempt to correct the situation, the pilot switched the RPM back to 5700, but the aircraft continued to lose altitude and speed. Approximately 160 seconds after takeoff, the aircraft banked to the left and struck the ground near Wola Przypkowska. The pilot sustained light injuries, while the passenger was uninjured.
The investigation
The PKBWL investigation examined the flight sequence, the aircraft's mechanical state, and the pilot's actions. The investigation utilized data from a cockpit camera, which recorded the aircraft's speed and altitude. The investigators also reviewed the pilot's qualifications and the aircraft's maintenance and registration status. It was noted that the aircraft was not insured and had not been reported to the ULC for a stay exceeding three months. Additionally, the investigation found that the aircraft was moved from the crash site to a hangar without proper authorization, and the accident was not immediately reported to the authorities by the crew.
Findings
- The primary cause of the accident was a pilot error involving the maintenance of an excessive climb angle while simultaneously reducing propeller RPM.
- A contributing factor was the premature reduction of propeller RPM before reaching the required climb speed and altitude.
- At the time of the RPM reduction, the aircraft's airspeed was approximately 55 km/h, which was insufficient for the configuration.
- The reduction in RPM increased the load on the propeller, preventing the aircraft from maintaining its climb and leading to a loss of airspeed and altitude.
- The engine and propulsion system remained functional until the moment of impact.