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AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - REFUELING AND DEFUELING
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A318/A319/A320/A321 FLEET DSC-28-10-70 P 6/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - FUEL QUANTITY INDICATION AND LEVEL SENSING
A318/A319/A320/A321 FLEET DSC-28-10-80 P 1/4
FCOM 19 AUG 10
FUEL QUANTITY INDICATION (FQI) SYSTEM
Applicable to:
MSN,
The FQI is a computerized system that :
transmits the actual total fuel mass, as well as the quantity and temperature ‐ of fuel in the tanks, to
the ECAM.
‐ controls automatic refueling.
Two channels perform fuel computations : channel 2 activates automatically if channel 1 fails.
The FQI system has :
‐ an FQI computer.
‐ a set of capacitance probes in each tank to measure fuel level and temperature.
‐ one densitometer (cadensicon) sensor in each wing inner tank permitting the calculation of the fuel
quantity.
‐ one Capacitance Index Compensator (CIC) in each inner tank giving the dielectric constant of the
fuel in case of cadensicon failure.
‐ a quantity indicator for each tank installed on the refuel/defuel panel.
‐ a preselector on the refuel/defuel panel that shows the preselected and actual total fuel quantity.
FUEL QUANTITY INDICATION (FQI) SYSTEM
Applicable to: ,
, MSN,,
The FQI is a computerized system that :
‐ transmits the actual total fuel mass, as well as the quantity and temperature of fuel in the tanks, to
the ECAM.
‐ controls automatic refueling.
Two channels perform fuel computations : channel 2 activates automatically if channel 1 fails.
The FQI system has :
‐ an FQI computer.
a set of capacitance probes in ‐ each tank to measure fuel level.
‐ sensors in each wing tank to measure fuel temperature.
‐ devices for measuring fuel characteristics such as density
‐ a multi tank indicator allowing the quantity for each tank to be displayed on the refuel/defuel panel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - FUEL QUANTITY INDICATION AND LEVEL SENSING
A318/A319/A320/A321 FLEET DSC-28-10-80 P 2/4
FCOM 19 AUG 10
FUEL LEVEL SENSING CONTROL UNIT (FLSCU)
Applicable to:
MSN,
The fuel level system generates fuel-level and fuel-temperature signals in order to operate the
appropriate switching functions for refueling and defueling and control the IDG cooling recirculation
system and the center-tank-to-wing-tank fuel transfer system.
The FLSCU comprises :
‐ fuel level sensors in the tanks to sense high, low, and overflow levels.
‐ a fuel temperature sensor to control the IDG cooling recirculation.
When fuel quantity in one wing tank goes below 750 kg (1 650 lb), the low-level sensor triggers the
LO LVL warning on ECAM.
FUEL LEVEL SENSING CONTROL UNIT (FLSCU)
Applicable to: ,
, MSN,,
The fuel level system generates fuel-level and fuel-temperature signals in order to operate the
appropriate switching functions for refueling and defueling and control the IDG cooling recirculation
system and the center-tank-to-wing-tank fuel transfer system and ACT �� to center tank fuel
transfer system.
The FLSCU comprises :
‐ fuel level sensors in the tanks to sense high, low, and overflow levels.
‐ a fuel temperature sensor to control the IDG cooling recirculation.
When fuel quantity in one wing tank goes below 750 kg (1 650 lb), the low-level sensor triggers the
LO LVL warning on ECAM.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - FUEL QUANTITY INDICATION AND LEVEL SENSING
A318/A319/A320/A321 FLEET DSC-28-10-80 P 3/4
FCOM 19 AUG 10
FUEL SYSTEM ARCHITECTURE
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - FUEL QUANTITY INDICATION AND LEVEL SENSING
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A318/A319/A320/A321 FLEET DSC-28-10-80 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-28-20 P 1/24
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
MSN,
(1) L (R) TK PUMPS 1 (2) pushbutton sw
On : Pump is on, but only fuel feeds, when the center tank pumps' delivery pressure
drops below the threshold.
OFF : Pump is OFF, and the OFF button comes on white.
FAULT
light
: Amber light, and ECAM caution, comes on, when the delivery pressure drops. It
does not come on when OFF is selected.
(2) MODE SEL pushbutton sw
　
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