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An additional volume of 2% is available for
expansion without spillage into the vent surge
tank.
STL 945.7136/97
A319/A320 fuel system – engine feed
7.4
IAE Eng CFM Eng
Surge tank Outer cell Inner cell
26
22
15
Fuel recirculation
system
Sequence valves Pump
Center
tank
Defuel valve
(ground only)
Cross feed valve
twin actuators
APU
pump
APU LP valve
twin actuators
Suction valve
(gravity feed)
Transfer valves
STL 945.7136/97
A319/A320 fuel system – engine feed
7.5
A319/A320 definition
Fuel is delivered to the engines by means of booster
pumps.
- Each tank is equipped with two identical booster
pumps.
- Center tank feeds first, except during take-off and
fuel recirculation when center tank pumps are
switched off automatically.
- Wing tank pumps operate permanently at a lower
pressure than center tank pumps.
- Thus, when center tank pumps stop, engine feed
comes automatically from wing tank pumps.
Two electrical transfer valves are installed on each
wing.
They automatically open when the inner cell fuel
reaches a low level (about 750kg) for fuel to drain
from the outer to the inner cells.
Fuel is recirculated automatically and transparently
to the crew :
It ensures the IDG cooling (CFM and IAE eng.) and
the engine oil cooling (IAE only) through a set of
valves controlled by the FADEC.
STL 945.7136/97
A321 fuel system – engine feed
7.6
IAE Eng CFM Eng
Surge tank Wing tank
26
22
Suction valve
(gravity feed)
Recirculation line
APU
fuel pump Defuel/tansfer
Valve twin actuators
(ground only)
Cross feed valve
(twin actuators)
Fuel recirculation
system
Sequence
valve
Remote pick-up
(all pumps)
Center tank
Center tank
transfer valves
Pumps Jet pumps
APU LP valve
(twin actuators)
STL 945.7136/97
A321 fuel system – engine feed
7.7
A321 definition
The A321 fuel system has been simplified compared to
the A319/A320 :
Single wing tank in place of two cells wing tank,
suppression of the outer/inner cell transfer valves.
Center tank transfer to wing tank in place of center
tank feed to engines :
When the transfer valves are open, fuel tapped from
the wing pumps flows into the center tank jet pumps.
It creates a depressurization which sucks the center
tank fuel into the wing tanks
- a transfer valve automatically closes when the
related wing tank is overfilled or when the center
tank is empty.
The fuel recirculation principle is identical to
A319/A320, the recirculated fuel being returned into the
wing tank.
STL 945.7136/97
A319/A320A321 fuel system – control and indications
7.8
A319/A320 OVERHEAD PANEL A321
A319/A320 A321
UPPER ECAM
LOWER ECAM
Fuel on board
Memo indications :
systems temporarily
used
Low pressure valve
Cross-feed valve
Pumps
indication
STL 945.7136/97
A319/A320A321 fuel system – control and indications
7.9
No crew action is required for normal operation.
Indications :
- fuel data (quantity, temperature) are available
from a Fuel Quantity Indication (FQI) system
- fuel quantity is permanently displayed on upper
ECAM DU
- fuel system synoptic on lower ECAM DU is
displayed according to ECAM logic
- low level warning is totally independent from FQI.
Abnormal operations :
- fuel feed sequence may be operated manually
- one or both engines may be fed from any tank via
cross-feed valve
- gravity feed is possible from wing tanks.
STL 945.7136/97
A319/A320A321 fuel system – refuel/defuel
7.10
Fuel quantity
indicator
Refuel valve
control
Refuel
preselector
Fuselage datum line
Refuel
coupling and cap
Refuel coupling
In cockpit (optional)
Refuel panel :
STL 945.7136/97
A319/A320A321 fuel system – refuelling
7.11
Refuel/defuel control is from an external panel
located in the fuselage fairing under the RH wing
within easy reach from the ground.
One refuel/defuel coupling is located under the RH
wing.
Identical coupling on LH wing is available as an
option.
Refuelling is auto sequenced :
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A319/A320/A321飞行员驾驶舱和系统简介(12)
