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  • Chapter 2: Engine Fuel & Fuel Metering Systems › Engine Fuel System Components › Fuel Filters

    engine-driven fuel pump and various control devices. An additional high-pressure fuel filter is installed between the fuel pump and the fuel control to protect the fuel control from contaminants that could come from the low pressure pump ... thousandth of 1 millimeter.) The porous cellulose material frequently used in construction of the filter cartridges is capable of removing foreign matter measuring from 10–25 microns. The minute openings make this type of filter susceptible to clogging; therefore…

  • Chapter 14: Aircraft Fuel Systems › Fuel Pumps › Centrifugal Boost Pumps

    valve is typically installed so the pump can be removed without draining the fuel tank. [Figure 14-48] A centrifugal boost pump is a variable displacement pump. It takes in fuel at the center of an impeller and expels ... check valve prevents fuel from flowing back through the pump. A fuel feed line is connected to the pump outlet. A bypass valve may be installed in the fuel feed system to allow the engine-driven pump to pull fuel…

  • 14 CFR Part 135, Appendix A to Part 135—Additional Airworthiness Standards for 10 or More Passenger Airplanes

    demonstrated that the pump installations provide a reliability and durability equivalent to that in FAR 23.991(a). 44. Fuel strainer or filter. For turbopropeller powered airplanes, the following apply: (a) There must be a fuel strainer or filter between ... fuel metering device of the engine. In addition, the fuel strainer or filter must be— (1) Between the tank outlet and the engine-driven positive displacement pump inlet, if there is an engine-driven positive displacement pump; (2) Accessible…