Flashcards on Aircraft Engine Fuel Systems and Induction
Aircraft Engine Fuel Systems and Induction Explained for Students
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Turbine Engine Fuel Systems
8 cards
Card 1
Question: What is a compensated relief valve in an engine-driven fuel pump?
Answer: A pressure relief valve acted upon by a diaphragm and a spring; atmospheric pressure on the diaphragm makes pump discharge pressure remain a set amoun
Card 2
Question: What is the purpose of the pressurizing and dump valve in a turbine engine fuel system during normal operation?
Answer: It acts as a flow divider, directing fuel into the main or pilot manifold so fuel is discharged from the correct orifice in the duplex fuel nozzle.
Card 3
Question: What does the dump function of the pressurizing and dump valve do when the engine is shut down?
Answer: It dumps all the fuel from the manifold.
Card 4
Question: What actions should be taken if a reciprocating engine has been operated on turbine engine fuel?
Answer: Drain and flush the entire fuel system with proper fuel; perform a compression check; borescope-inspect all cylinders; drain the oil; check all filter
Card 5
Question: What are the two basic types of turbine engine fuel mentioned?
Answer: Jet A and Jet A-1 (kerosene-based). Jet B (gasoline-based) is also noted as a different type.
Card 6
Question: Why are fuel heaters used in some turbine engine fuel systems?
Answer: To keep fuel warm so any water that precipitates out will not freeze on the filters.
Card 7
Question: What are two reasons Prist is added to turbine engine fuel?
Answer: It is biocidal—kills scum-forming bacteria in the fuel tank—and acts as an antifreeze, lowering the freezing point of entrained water released from th
Card 8
Question: Why do some aircraft fuel filters include a built-in relief valve?
Answer: So unfiltered fuel can flow to the fuel control device if the filter becomes plugged with ice or other contaminants.