What happened
On 24 September 2022, during a gliding competition for landing accuracy at Lubin airport (EPLU), a Socata-Rallye 235 E-D (registration SP-WOP) experienced an engine failure following the release of a glider. After the tow rope was disconnected at an altitude of approximately 300 m, the pilot deviated from the flight path and began a descent.
While attempting to execute a right turn to approach the airfield, the pilot found the engine unresponsive to throttle increases. Despite attempts to troubleshoot the issue by checking the carburetor heat and switching fuel sources, the engine failed to regain power. The pilot subsequently attempted an emergency landing, during which the aircraft flew over allotment gardens and intercepted electric traction wires of a nearby railway line. The aircraft made contact with the wires, causing a sudden deceleration and structural damage. The aircraft was destroyed during the impact, though the pilot escaped without injury.
The investigation
The PKBWL investigation focused on the engine's performance and the pilot's actions during the descent. Investigators examined the fuel system, including the fuel pumps, fuel lines, and the carburetor. Testing confirmed that both the mechanical and electric fuel pumps were fully operational and that the fuel itself was free of contaminants or water.
Analysis of the cockpit revealed that the pilot's seat was positioned as far forward as possible. This positioning made the fuel valve lever, located under a notch in the center panel, difficult to manipulate. The investigation also reviewed the flight path, noting that the pilot's turn toward the airport was executed far to the east, which increased the distance required for the approach.
Findings
- The primary cause of the engine failure was the unintentional closure of the engine fuel supply by the pilot, likely occurring unconsciously after the glider was released.
- The pilot had limited experience with the Socata-Rallye 235 E-D aircraft, having performed only a small number of flights in this specific type.
- The execution of the right turn for the final approach was performed too far from the airport, which prevented the pilot from reaching the runway.
- The aircraft's structural damage was exacerbated by the impact with railway electric traction wires.