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in the tanks or in the APU fuel line.
When a pump is removed, the fuel pressure closes the
canister inlet and outlet.
PRESSURE SWITCH
The pressure switch controls pump operation. The
pressure in the left crossfeed line goes through the
check valve to operate a microswitch.
The APU fuel pump stops if the crossfeed line pressure
reaches 23.3 PSI absolute (1.6 bar) and restarts at
21,7 PSIA (1.5 bar).
APU LOW PRESSURE (LP) SHUT-OFF VALVE
The APU Low Pressure fuel shut-off valve is used to
isolate the APU fuel supply line from the left engine
feed line, when the APU does not operate. The two DC
motors in the actuator are supplied from different 28
VDC sources.
The valve opens when:
- The APU MASTER SW is set to ON, or the FUEL
VENT push-button switch in the APU compartment
is pressed and held.
The FUEL VENT pushbutton is used to purge the system
during ground maintenance.
- The valve closes when:
- The APU MASTER SW is set to OFF.
- The FUEL VENT pushbutton is released.
- The APU FIRE pushbutton switch on the overhead
panel is pressed.
- The APU FIRE SHUT-OFF switch on the panel
forward of the nose landing gear bay is
operated.
- The fire detection system operates on the
ground.
TMUFUKE01-T01 LEVEL 3
EFFECTIVITY 28-22-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 122
ALL
APU FEED SYSTEM DESCRIPTION AND OPERATION
TMUFUKE01-P01 LEVEL 3
EFFECTIVITY 28-22-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 123
ALL
CROSSFEED OPERATION
When the crossfeed valve is open, the right-hand engine
feed line can also supply the APU fuel supply line.
FUEL VENT PUSHBUTTON
When the aircraft is on the ground, it is possible to
operate the pump to purge the fuel line.
A pushbutton (hold) on FR 80 in the APU compartment
is used to operate the pump.
APU MASTER SWITCH
If the APU MASTER SW pushbutton is pressed to ON, the
APU pump will operate if the pump inlet pressure is
below 1.5 bar (21.7 PSI) absolute.
This is initiated automatically through the pressure
switch.
TMUFUKE01-T01 LEVEL 3
EFFECTIVITY 28-22-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 124
ALL
SELF EXAMINATION
The function of the APU fuel pump pressure switch
is:
A - To signal any pressure to the ECAM.
B - To control the pump operation.
C - To shut the APU LP valve in case of fire.
How many motors does the APU LP valve have?
A - One DC motor.
B - Two DC motors.
C - Two motors, one DC (for a battery start)
and one AC.
TMUFUKE01 LEVEL 3
EFFECTIVITY 28-22-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 125
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFUKE01 LEVEL 3
EFFECTIVITY 28-22-00 Page 6
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 126
ALL
28 - FUEL SYSTEM
28-20-00 MAIN FUEL PUMP SYSTEM COMPONENTS
CONTENTS:
Pressure Switch
Air Release Valve
Sequence Valve
Center Tank Fuel Pump
Center Tank Fuel Pump Removal Information
Wing Tank Fuel Pump
Wing Tank Fuel Pump Removal Information
Scavenge Jet Pump
Transfer Valve
Transfer Valve Drive
Transfer Valve Actuator
TMUFUEK01 LEVEL 3
EFFECTIVITY 28-20-00 Page 1
Apr 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 127
ALL
MAIN FUEL PUMP SYSTEM COMPONENTS
PRESSURE SWITCH
IDENTIFICATION
FIN: 23QA, 27/24QA, 28QA (39QA, 40QA)
LOCATION
ZONE: 570, 571, 670, 671 (140)
COMPONENT DESCRIPTION
A pressure switch for each fuel pump is mounted on the
outside face of the rear wall of the tanks
TMUFUEK01-T01 LEVEL 3
EFFECTIVITY 28-20-00 Page 2
Apr 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 128
ALL
TMUFUEK01-P01 LEVEL 3
MAIN FUEL PUMP SYSTEM COMPONENTS - PRESSURE SWITCH
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ATA 28 FUEL SYSTEM(15)
