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valve to close.
Exposure of the optional ACT low level sensors causes
the fuel forward transfer to stop.
FULL LEVEL
When the inner cell full level is reached, the center
tank pumps are signalled to stop and the inner cell
pumps then supply the engines until the fuel level
reaches the underfull level.
The full level sensors monitor the IDG fuel cooling
recirculation.
UNDERFULL LEVEL
When fuel level in the wing tank inner cell drops to
the underfull sensors, they signal the center tank
pumps to restart, provided fuel is in center tank.
There is approximately 1100 lbs (500 kg) difference
between the full level and the underfull level.
OVERFLOW LEVEL
If the center tank pump fails to stop with inner cell
full level reached, the fuel will overflow into the
surge vent tank and the overflow sensor signals the
return valve to close.
TEMPERATURE SENSING
To ensure that the fuel temperature at the engine inlet
does not exceed the engine limits, the temperature
sensors signal the closure of the return valve.
TMUFUEC01-T01 LEVEL 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
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TMUFUEC01-P01 LEVEL 3
FUEL LEVEL SENSING
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
EFFECTIVITY Page 249
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SELF EXAMINATION
What happens when a low level is detected in the
inner cell?
A - Automatically, transfer valves open to
admit fuel to inner cell.
B - Automatically, transfer valves close to
isolate the inner cell.
C - Restart of the pumps to suck fuel from
the outer cell.
What is the purpose of the IDG SHUT-OFF sensor?
A - To stop the center tank pumps.
B - To restart cooling fuel recirculation.
C - To stop the cooling fuel recirculation
In which cells are full level sensors fitted?
A - Inner and outer cells.
B - Inner cells only.
C - Outer cells only.
What happens if a high level is detected?
A - A warning is triggered: too much fuel.
B - All the refuelling operations are
stopped.
C - The corresponding refuel valve closes.
TMUFUEC01 LEVEL 3
EFFECTIVITY 28-46-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 250
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28 - FUEL SYSTEM
28-43-00 MANUAL MEASUREMENT
CONTENTS:
Fuel Level Magnetic Indicator Location
Fuel Level Magnetic Indicator Operation
Attitude Monitor
Fuel Quantity Tables
TMUFUEA01 LEVEL 1
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MANUAL MEASUREMENT
FUEL LEVEL MAGNETIC INDICATOR LOCATION
Without electrical power, the quantity indicating
system is inoperative. In this case, the fuel Manual
Magnetic Indicators must be used to monitor the
quantity in the tanks.
One Manual Magnetic Indicator (MMI) is installed in
the center tank and five in each wing tank: 4 in each
inner cell, 1 in each outer cell.
TMUFUEA01-T01 LEVEL 1
EFFECTIVITY 28-43-00 Page 2
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TMUFUEA01-P01 LEVEL 1
MANUAL MEASUREMENT - FUEL LEVEL MAGNETIC INDICATOR LOCATION
EFFECTIVITY 28-43-00 Page 3
Jan 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
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EFFECTIVITY Page 253
ALL
MANUAL MEASUREMENT
FUEL LEVEL MAGNETIC INDICATOR OPERATION
Prior to using the Magnetic Manual Indicators, a
reading is taken on the attitude monitor to determine
the out-of-level attitude of the aircraft in the pitch
and roll axes.
To measure the FUEL QUANTITY, the magnetic level
indicator has to be unlocked. To accomplish this, use
a screwdriver to push the applicable MMI and turn it
through 90deg. Hold and carefully lower the MMI fully.
Then carefully lift the MMI until you fell the magnets.
Read the units mark nearest to the bottom-skin of the
wing and write down the number. Retract the MMI and
use a screwdriver to turn it through 90 deg to lock
it. Use the table for the applicable aircraft attitude
　
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