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3. The outer tanks : Fuel transfers into the inner tanks.
CENTER TANK PUMPS CONTROL LOGIC
* Each center tank pump stops, until approximately 500 kg (1 100 lb ) of the fuel in its associated
inner tank fuel has been used (when the fuel level reaches the underfull sensors).
With the MODE SEL in the MAN position, the center tank pumps will run. In manual mode, the
CTR TK PUMP pushbuttons must be selected OFF, when the center tank is empty.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - ENGINE FEED
A318/A319/A320/A321 FLEET DSC-28-10-30 P 9/12
FCOM 19 AUG 10
FUEL TRANSFER FROM OUTER TO INNER TANKS
The transfer valves automatically open, when the inner tank fuel reaches the low level (about
750 kg/1 650 lb), thus enabling the fuel to drain from the outer to inner tanks.
When open, the valves are latched open. They will automatically close at the next refueling
operation.
Note: 1. Two level sensors are installed in each inner tank. Each sensor controls two transfer
valves, one in each wing, ensuring simultaneous transfer to both wings.
2. The 750 kg/1 650 lb value is based on a level aircraft attitude, with no acceleration.
During steep descent or acceleration/deceleration, the transfer valves may open with
more than 750 kg/1 650 lb of fuel in each inner tank, and the low level warning may be
triggered.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - ENGINE FEED
A318/A319/A320/A321 FLEET DSC-28-10-30 P 10/12
FCOM 19 AUG 10
ECAM INDICATION
FUEL FEED SEQUENCE
Applicable to: ,
, MSN,,
The wing tanks feed fuel to the engines. The tanks empty in the following sequence :
1. The center tank : Fuel transfers into the wing tanks.
2. The wing tanks.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - ENGINE FEED
A318/A319/A320/A321 FLEET DSC-28-10-30 P 11/12
FCOM 19 AUG 10
CENTER TANK FUEL TRANSFER
The transfer system controls the flow of fuel from the center tank to the wing tanks. The Fuel Level
Sensing Control Unit (FLSCU) has automatic control of the transfer valve. When the transfer valve
is open, fuel from the wing tank pumps flows through the jet pump and creates a suction in it. This
suction moves the fuel from the center tank to the related wing tank.
CENTER TANK TRANSFER VALVE CONTROL LOGIC
The FLSCU automatically closes the associated center tank transfer valve when the wing tank
is full. The FLSCU then reopens the center tank transfer valve when the engines have used
250 kg (550 lb) of wing tank fuel (when the fuel level reaches the underfull sensors).
With the MODE SEL in MAN position, the center tank transfer valves will open. Wing tank
overflow must be prevented by selecting the CTR TK XFR phushbuttons off when the wing
tanks are full. They must also be selected off when the center tank is empty.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - ENGINE FEED
A318/A319/A320/A321 FLEET DSC-28-10-30 P 12/12
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - APU FEED
A318/A319/A320/A321 FLEET DSC-28-10-50 P 1/2
FCOM 19 AUG 10
APU FEED
Applicable to: ALL
A special fuel pump supplies fuel for APU startup when fuel feed pressure is low (due to loss of tank
pumps or loss of normal AC electrical supply). This pump normally runs off the AC ESS SHED, but
runs off the AC STAT INV BUS if the AC ESS SHED fails.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - APU FEED
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-28-10-50 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - FUEL RECIRCULATION SYSTEM
A318/A319/A320/A321 FLEET DSC-28-10-60 P 1/4
FCOM 19 AUG 10
FUEL RECIRCULATION SYSTEM
Applicable to: MSN
4566,
Refer to DSC-70-45-60 GENERAL
Some of the fuel supplied to each engine goes from the high-pressure fuel line in that engine,
through the integrated drive generator (IDG) heat exchanger (where it absorbs heat), to the fuel
return valve and to the outer fuel tank.
This operation ensures the IDG cooling when the oil temperature is high or when at low engine
power.
The FADEC controls the fuel return valve.
If the outer tank is already full, the fuel overflows to the inner tank through a spill pipe.
If center tank is feeding, the wing tank will tend to overfill and the system automatically selects the
　
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