Getting to Grips with Aircraft Weight and Balance(22)

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2.2.2. Control and indication
The A320 family aircraft are fitted with a Fuel Quantity Indication (FQI) system and three Fuel Level Sensor Control Units (FLSCU).
The FQI provides the crew with information regarding fuel (total fuel mass, quantity and
temperature in each tank) via the ECAM and based on data from:
. A set of capacitance probes in each tank measuring fuel level and temperature,
. One densitometer (cadensicon) sensor in each wing inner tank (in wing tank for
A321) to measure density of fuel and,
. One CIC (capacitance Index Compensator giving the dielectric constant of the
fuel) to give the density in case of cadensicon failure.

SYSTEMS

A318/319/320 ECAM fuel page A321 ECAM fuel page

B. FUEL SYSTEMS

SYSTEMS

The FQI also controls the automatic refueling by determining the target levels in each tank.
The FLSCUs include probes and temperature sensors located in the tanks during refueling and transfer to detect low and high fuel levels in tanks. They generate signals that are used to operate the valves during refueling and transfers (from center tank to wing tanks as well as from ACTs to center tank).
On A319CJ, which can be fitted with up to 6 ACTs, specific units (AFMC - Auxiliary Fuel Management Computer and ALSCU - Auxiliary Level Sensor Control Unit) are dedicated to ACT fuel management.
The following diagram presents the fuel system architecture:
WING TANK
PROBES &
SENSORS

FLSCU (FUEL
LEVEL
SENSOR
CONTROL
UNIT)

REFUEL
VALVES

 

REFUEL
CONTROL
PANEL

 

ECAM
UPPER
DISPLAY

ECAM FUEL
DISPLAY

FMGS

FLIGHT
CREW

FQI
COMPUTER

ADIRS

 

WING TANK
PROBES &
SENSORS

B. FUEL SYSTEMS

2.3. CG travel during refueling
2.3.1. A318/A319/A320
The refueling sequence and the resulting fuel vector are the same for A318, A319 and A320 aircraft:
Fuel Weight (kg)

24000 
22000  . 
20000 
18000 
16000 
.  14000 
12000 
10000 
8000 
6000. 
4000 
2000  . 
0. 

 

.
Outer tanks (full). If an inner tank contains less than 750 kg of fuel, valves between the outer and inner tanks open and fuel spills from

the outer to the inner tanks (2).

.
Inner tanks (full)

.
Center tank (full)

.
ACT1 then ACT 2 (if applicable)

-15 -5 5 Delta Index
The graphs below illustrate examples of the fuel vector impact on the certified CG envelopes:
80  80 
75  75 
70  70 
　
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