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Fuel inlet port.
-Discharge port to HMU.
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Supply to FRV.
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Supply to servo fuel heater.
-LP stage discharge pressure tap.
-HP stage discharge pressure tap.
EFG
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CTC-201-089-02
EFFECTIVITY
CFM56-5B TRAINING MANUAL
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FUEL PUMP HOUSING
73-11-10
Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
Fuel pump drive system.
The fuel pump is fuel lubricated, and the necessary rotative motion is provided by a drive system consisting of concentric shafts :
The main drive shaft is driven by the AGB, and drives the HP stage drive spur gear through splines.
The HP stage drive spur gear, through splines, drives the LP stage driveshaft, which in turn drives :
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The HMU, through the HMU drive shaft.
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The LP stage, through the hollow shaft.
The fuel pump drive system is equipped with shear neck sections to provide :
-Protection of the AGB against any excessive torque
created within the fuel pump assembly.
-Assurance of the HMU drive operation, even in case
of total failure of the LP stage pump.
EFG
CTC-201-090-02
EFFECTIVITY
73-11-10 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
Fuel pump Low Pressure (LP) stage.
The LP stage is a centrifugal type pump, which delivers boost pressure to the HP stage to avoid pump cavitation.
The fuel pump LP stage consists of :
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A swirl inducer, with helical grooves and a scroll.
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An impeller, provided with swirl ramps, supported by
two plain bearings.
The cavity for the impeller/inducer cluster is provided by the pump cover.
The front and rear bearings, the LP pump drive shaft splines, and the HMU drive shaft splines are lubricated with fuel tapped from the scroll at the fuel pump LP stage fuel discharge.
EFG
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CTC-201-091-01
EFFECTIVITY
73-11-10 Page 11
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL PUMP
Fuel pump High Pressure (HP) stage.
The fuel pump HP stage is a positive displacement gear type pump.
For a given rotational speed input (RPM), the pump delivers a constant fuel flow, regardless of the discharged pressure.
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