If fuel contamination is suspected during an inspection, what should be done?

When fuel contamination is suspected during an inspection, draining and flushing the fuel system is critical for several reasons. Contaminated fuel can introduce harmful substances into the engine, leading to improper combustion, engine performance issues, or even failure. By thoroughly draining the fuel system, you remove any contaminated fuel that may still be present, alongside particulates, water, or other harmful substances.

Flushing the system ensures that any remnants of the contaminants are cleared, allowing clean fuel to circulate through the fuel lines, pump, and injectors. This process is vital to restoring proper functionality and ensuring that the engine operates safely and efficiently. Monitoring the engine closely, changing the fuel filter, or replacing the entire fuel system would not adequately address the immediate need to remove contaminants, making these alternatives less effective in the situation presented. The approach of draining and flushing highlights the importance of preventive maintenance and safety in aircraft operation.