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UF94200
EFFECTIVITY Page 317
ALL
FUEL TRANSFER OPERATION
TMUFUES03-P02 LEVEL 3
EFFECTIVITY 28-25-00 Page 146
Apr 31/94
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 318
ALL
28 - FUEL SYSTEM
28-42-00 QUANTITY INDICATING
C0NTENTS:
General
FQI Computer
Probes
Dualcomp
Ultracomp
Fuel Level Sensing Control Units (FLSCUs)
Refuel / Defuel Control Panel
Multi-Tank Indicator (MTI)
Preselector
LGCIU 1
L/G Control Lever
ADIRU 1/2
CFDS
FMGCs
ECAM
Self Examination
TMUFUEB03 LEVEL 3
EFFECTIVITY 28-42-00 Page 1
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 319
ALL
QUANTITY INDICATING
GENERAL
The Fuel Quantity Indicating is a computerized
capacitance type system.
The system mainly provides:
- fuel mass/temperature measurement and display,
- automatic control of aircraft refuelling,
- system integrity monitoring using BITE,
- ARINC 429 digital data for interface to other
systems.
FQI COMPUTER
The Fuel Quantity Indicating Computer (FQIC) performs
the fuel mass calculations and controls the whole
system by means of various interfaces.
The Fuel Quantity Indicating Computer has two identical
channels. Each channel calculates the tank quantities
and monitors the other; the most accurate being the
operational one. If one channel fails the system
operates normally, but the CFDS report will indicate
the failure as well as the ECAM with a fault message
on the upper DU.
PROBES
A set of capacitance probes in each tank sends a signal
to the computer in relation to the fuel level in the
tank. There are 5 probes in the center tank and 14 per
wing tank. 2 probes are located in the optional
additional center tank. A single probe failure doesn’t
affect the system indication. In each wing tank, fuel
probe N° 2 provides fuel temperature indication to the
ECAM.
DUALCOMP
The dualcomp is installed in the fuel tank and operates
as a variable capacitor.
The capacitance value is a result of the density of
the fuel between the plates.
The fuel density changes with temperature and type of
fuel.
ULTRACOMP
The ultracomp has three functions:
- variable capacitors value (same function as
the dualcomp),
- a velocimeter measurement function,
- a temperature sensing function.
All this information together with the dualcomp is
used by the FQIC to calculate the density of the fuel.
FUEL LEVEL SENSING CONTROL UNITS (FLSCUs)
This FLSCUS are mainly used:
- To shut the related refuel valve when the high
level is reached in each tank.
- To initiate the BITE test of the high level
sensors and their related circuits,
by using the test switch on the Refuel/Defuel
control panel.
High level sensors in each tank, send a signal to the
FQIC, via the FLSCU. The test is initiated via the
FQIC and the FLSCU. Sensor and system status are sent
from the FQIC to the CFDS.
TMUFUEB03-T01 LEVEL 3
EFFECTIVITY 28-42-00 Page 2
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 320
ALL
TMUFUEB03-P01 LEVEL 3
QUANTITY INDICATING
EFFECTIVITY 28-42-00 Page 3
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 28 FUEL SYSTEM
UF94200
EFFECTIVITY Page 321
ALL
QUANTITY INDICATING
REFUEL/DEFUEL CONTROL PANEL
The Fuel Quantity Indicating Computer provides
automatic shut-off at a preselected refuel quantity.
When the MODE SELECT switch on the Refuel/Defuel
control panel has been set to the REFUEL position,
the FQIC first makes sure that it is physically
possible to take the preselected fuel quantity into
the aircraft.
Throughout the automatic refuel operation the FQIC
monitors the density of fuel in each tank and the
distribution of the load.
MULTI-TANK INDICATOR (MTI)
A multi-tank indicator displays the fuel quantity in
each tank.
PRESELECTOR
The PRESELECTOR shows the preselected and actual total
fuel quantities as monitored by the computer.
LGCIU 1
The FQIC receives left and right landing gear
compressed information from the LGCIU 1.
L/G CONTROL LEVER
The FQIC receives ground information from the landing
　
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