What happened
The pilot reported experiencing a failure of the rear engine, which was subsequently followed by a failure of the front engine. The sequence of events led to an accident involving the aircraft. An examination of the wreckage provided critical insights into the mechanical state of the powerplant systems at the time of the incident.
The investigation
A detailed examination of the wreckage disclosed that fuel was present in the right fuel system, but no fuel was located in the left inboard system. Furthermore, water was found in both engine fuel flow dividers. Investigators were unable to determine if the pilot operated the crossfeed position throughout the flight, leaving the status of fuel distribution between tanks uncertain.
Findings
The presence of water in both engine fuel flow dividers indicates significant fuel contamination. The lack of fuel in the left inboard system suggests a potential imbalance or blockage, though the exact mechanism remains unclear due to the inability to confirm crossfeed usage. The sequential nature of the failures points to a systemic issue affecting the fuel supply rather than isolated mechanical faults.
Safety message
This incident highlights the critical importance of monitoring fuel quality and ensuring that fuel systems are free from contamination such as water. Pilots should be vigilant regarding fuel management practices, including the proper use of crossfeed valves, to maintain engine performance and safety.