PP61 Lecture 6 Test 11/20 Flashcards
The fuel system performs the following functions (3)
Storage, delivery and distribution
Aircraft fuel systems have two basic sections. The powerplant section consists of…
The parts from the engine driven pump (EDP) to the fuel nozzles (delivery)
Which FAR sets the requirements for the aircraft fuel systems?
FAR 23
What are three of the requirements for fuel on turbine powered aircraft?
- Turbine powered aircraft must have sustained operation with water in the fuel (.75ccm/gl @ 80F)
- T.P.ACFT. fuel system supplies 100% of the fuel required for ops in all altitudes
- Tank marked jet fuel
Why are fuel heaters usually used on commercial aircraft?
To prevent the water in the fuel from freezing
Name the three jet fuels
Jet A, Jet A-1 and Jet B
What type of fuel feed system is used in turbine powered aircraft?
Pressure feed
What are auxiliary/boost pumps incorporates on aircraft?
To maintain positive fuel pressure on the inlet side of the engine driven pump
How is fuel supplied to a gas turbine engine in the event that the engine driven fuel pump becomes clogged or it fails?
Boost pump is an alternate source
What is the function of fuel strainers and fuel filters?
To remove and drain contaminants
Gas turbine engines use …. mesh filters and …. mesh filters
Coarse, fine
How is wire mesh size determined in a wire mesh rated fuel filter?
It is determined by the number of holes in one linear inch
How is a micron filter hole size determines in a micron rated fuel filter?
A micron is determined by size of each hole’s diameter
Why do some engine driven fuel pumps have a centrifugal boost element on gas turbine engines?
To increase fuel pressure before fuel reaches the spur gears
Why are engine driven pumps with dual elements common on gas turbine engines?
- Distribute the pump load
2. Provides redundancy
