15.11 fuel system Flashcards
Gas turbine engine fuel control systems are generally divided into three categories, what are they
hydromechanical
hydromechanical/electrical
Full Authority Digital Engine (or Electronics) Control (FADEC)
what does FADEC use for inputs and output
electronic sensors for its inputs
controls fuel flow with electronic outputs
what does a pure hydromechanical fuel control not have
electronic interface assisting in computing or metering the fuel flow
what does hydromechanical/electronic use to adjust the fuel flow
the Electronic engine control (EEC)
what does the EEC system consist of
the hydromechanical fuel control, EFCU, and aircraft-mounted Power Lever Angle (PLA) potentiometer
where is the PLA poteniometer mounted
in the throttle quadrant
what does FADEX not have
it has no hydromechanical fuel control backup system
where is FADEC most used
on Most aircraft having large high bypass turbofan engines
what is the primary component of the FADEC engine fuel control system
the EEC
what compares DATA drom channels A and B
crosstalk
what type of memory does EEC store
both volatile and non-volatile
where is the Fuel metering unit mounted
one the front face of the gearbox
what are the subsystems in the engine fuel system
fuel distribution
fuel control
The low-pressure fuel pump increases the fuel pressure from the tanks up to what PSI
approximately 175 PSI
engine driven fuel pumps are divided into two types
constant
non-constant
where are non-constant displacement pumps normally used
at the inlet of the engine driven pump
what are the three most common types of filters used
micron filter
wafer screen filter
plain screen mesh filter
what are the two methods to protect the connection of fluid lines against leaks
shrouded connections
double sealed connections
what are the two type of fuel nozzles
simplex
duplex
