Which component in a turbine engine fuel system is most prone to ice formation?

• A. The fuel pump
• B. The fuel control
• C. The fuel filter
• D. The fuel nozzle

Answer: (C)

Ice formation in turbine engine fuel systems happens where water in the fuel can collect and freeze. The fuel filter is the spot where free water tends to accumulate and where the cooled, water-laden fuel must pass through a narrow path. When temperatures are cold, ice can form on or inside the filter element, quickly blocking flow and causing fuel starvation to the engine. The other components aren’t as prone because they’re either in warmer flow paths or don’t concentrate water in the same way, so ice is less likely to develop there. This is why the fuel filter is the most likely place for icing to occur in a turbine engine fuel system.