What happened
On June 18, 2000, a privately operated Piper PA30, registration F-BCDC, was performing a VFR flight from Ile d'Yeu to Muret. The aircraft was carrying a pilot and four passengers. As the aircraft approached Muret, the pilot established a direct arrival for runway 12. During the final approach, the pilot initiated a right-hand turning maneuver to increase separation from another aircraft, a DR 400, which was also operating in the circuit.
During this maneuver, the aircraft experienced a significant loss of control. Witnesses reported hearing engine misfires and observing the aircraft bank sharply before entering a series of spins. The aircraft struck a cornfield with high vertical velocity, resulting in five fatalities and the destruction of the aircraft.
The investigation
The investigation focused on the aircraft's configuration, engine performance, and the pilot's decision-making during the approach. Investigators examined the wreckage and found the landing gear was extended and the flaps were in a near-full landing position. While the airframe remained largely intact, the right wing was nearly separated from the fuselage at the root.
Engine analysis revealed that while the left engine showed no functional defects, the right engine was not delivering significant power at impact. Although the fuel was found to meet 100LL specifications, investigators discovered traces of water within the right engine's mechanical pump, which had caused oxidation. Radar data confirmed that the aircraft was flying at a speed near its stall margin during the turning maneuver.
Findings
- The primary cause of the accident was a loss of control during a maneuvering turn on final approach.
- This loss of control was driven by a significant asymmetric thrust condition caused by a reduction in power from the right engine.
- The engine power loss was likely due to the right engine ingesting a mixture of fuel and water (condensation) present in the fuel system.
- Contributing factors included the aircraft's low airspeed, the high-drag configuration (gear and flaps extended), and turbulent atmospheric conditions.
- The low altitude at which the maneuver was performed, combined with the sun's low position on the horizon, prevented the pilot from recovering the aircraft from the resulting spin.