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between the pump and the LP valve.
LP VALVES
The LP valve is installed on the wing tank front spar,
in the feed line to the engine.
Each LP valve has a actuator with 2 electric motors,
each of which is supplied by different 28VDC power
sources.
The LP valve isolates the engine fuel feed supply at
shut-down (normal procedure) or in case of emergency
(engine fire procedure).
JET PUMPS
Center tank scavenge jet pumps move fuel and water
caught in the tank to the related main pump inlet.
Outer cell scavenge jet pumps move the surge tank fuel
to the rear intercell transfer valves.
Check valves, in the line between the surge tank,
combined with these jet pumps make sure that fuel can
not enter the surge tank via the pump if the main pumps
are off.
CROSSFEED VALVE
The crossfeed valve in the center (transfer) tank is
usually in the closed position.
In this position, it divides the main fuel pump system
into two parts (one part for each engine).
When the crossfeed valve is open, either tank can
supply fuel to either engine.
SEQUENCE VALVE
The wing tank pumps are equipped with a sequence valve
to make sure that the center tank is emptied first.
INTERCELL TRANSFER VALVE
The intercell transfer valves enable the outer cell
fuel to flow into the inner cell when the inner cell
low level sensors are dry.
FUEL SUPPLY LOGIC
When all the tanks contain fuel, the center tank will
be emptied first.Keeping a fuel mass in the wings as
long as possible reduces the bending stresses at the
wing roots.
When the center tank fuel has been used, engines are
supplied by the inner cells fuel. The outer cell fuel
flows to the inner cell by gravity through the transfer
valves which open when the inner cell fuel quantity
decreases to a given value.
TMUFUKA01-T02 LEVEL 3
EFFECTIVITY 28-21-00 Page 4
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 118
ALL
ENGINE FEED SYSTEM DESCRIPTION AND OPERATION
TMUFUKA01-P02 LEVEL 3
EFFECTIVITY 28-21-00 Page 5
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 119
ALL
SELF EXAMINATION
In normal operation, which tank will be emptied
first?
A - The inner cell.
B - The center tank.
C - The outer cell.
The by pass suction valve is in operation,
therefore:
A - The two wing tank pumps are in operation.
B - Only one wing tank pump supplies its
associated engine.
C - Both pumps are stopped.
On ground, the engines are stopped, how do you
close the LP valve?
A - By releasing out the ENG FIRE P/B.
B - By removing electrical power from A/C.
C - The valve is already closed.
TMUFUKA01 LEVEL 3
EFFECTIVITY 28-21-00 Page 6
Oct 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 120
ALL
28 - FUEL SYSTEM
28-22-00 APU FEED SYSTEM DESCRIPTION AND
OPERATION
CONTENTS:
General
Auxiliary Power Unit (APU) Pump
Canisters
Pressure Switch
APU Low pressure (LP) Shut-off Valve
Crossfeed Operation
FUEL VENT Pushbutton
APU MASTER SWITCH
Self Examination
TMUFUKE01 LEVEL 3
EFFECTIVITY 28-22-00 Page 1
Jul 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 121
ALL
APU FEED SYSTEM DESCRIPTION AND OPERATION
GENERAL
The APU fuel supply system comprises a fuel pump, an
LP fuel valve and an actuator on the rear wall of the
center tank. The fuel supply to the APU is normally
from the left-hand crossfeed line.
The APU LP fuel shut-off system has an LP fuel valve
that controls the supply of fuel to the APU. If an APU
fire occurs on ground, the APU emergency shut down
system closes the LP fuel valve to stop the flow of
fuel. When the crossfeed valve is open, either engine
feed line (left or right) can supply fuel to the APU.
AUXILIARY POWER UNIT (APU) PUMP
The fuel pressure for the APU comes from either the
engine fuel pumps or the APU fuel pump.
For normal operation, the essential busbar 801XP (115V
AC) supplies the pump motor. When the busbar is not
energized, the static inverter busbar 901XP (115V AC)
supplies the pump motor.
CANISTERS
The canister permits pump replacement even with fuel
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ATA 28 FUEL SYSTEM(14)
