mfuelg mfuelg
mfuselageg

B. FUEL SYSTEMS

This is the reason why the wing tanks are the first tanks to be filled and the last ones to be emptied and this no matter the aircraft type. Moreover, as the wing tanks are generally divided into outer and inner wing tanks (except on
A321), the outer tank is filled first in order to bring the mfuelg  vector further out. However, it is worth pointing out that this rule is only applicable to a certain extent : too much weight in the outer tanks creates some structural strain on the wings on ground (ie when not balanced by the lift). 
On top of this general considerations, each aircraft family (ie. A318/A319/A320/A321, A330/A340 and A300-600/A310) has its own characteristics. That is why this part presents the following aspects for each aircraft family separately:
. Fuel tanks: location and capacities 
. Fuel systems: engine feed system, control and indication
. CG travel during refueling: refueling sequence and resulting fuel vector
. In-flight CG travel: defueling sequence, in-flight fuel transfers
. CG control system (when applicable)
SYSTEMS

B. FUEL SYSTEMS

SYSTEMS

2. THE SINGLE-AISLE FAMILY
(A318/A319/A320/A321)

2.1. Tanks and capacities
Compared with A318/A319/A320, A321 wings have been modified in order to support higher weights. As a consequence, contrary to all the other Airbus aircraft, there is no separation between outer and inner tanks on A321.

2.1.1. A318/A319/A320

Note : One or two optional additional center tanks can be fitted (on the A319 and A320-200 only)
Fuel Capacity (Usable fuel) . density: 0.785kg/L
 Outer Tanks (x 2)  Inner Tanks (x 2)  Center Tank  Total without ACT  ACT  Total with 1 ACT  Total with 2 ACTs 
Volume  Liters  880  6925  8250  23860  2992  26852  29844 
US Gal  232  1830  2180  6304  790  7094  7885 
Weight  Kg  691  5436  6476  18730  2349  21079  23428 
Lb  1523  11984  14277  41292  5179  46471  51649 

Note: this does not apply to the A320-100, which has no center tank and slightly dissymmetrical inner tanks. Please refer to Weight and Balance Manual for relevant information.
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B. FUEL SYSTEMS

2.1.2. A319 Corporate Jet
The A319 CJ can be fitted with up to six additional center tanks. Due to specific issues raised by this configuration, applicable information will be presented separately from other A319 aircraft.
SYSTEMS

Fuel Capacity (Usable fuel) . density: 0.785kg/L

Outer Tanks  Inner Tanks  Center Tank  Total without ACT 
Volume  Liters  880 (x2)  6925 (x2)  8250  23860 
　
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