Systems Guide

Aerosoft
Airbus A320/A321
SYSTEMS
Systems guide
Vol
4
04-03-47
28 October 2014
FUEL
GENERAL
The fuel system has the follow functions
 Store fuel in the tanks
 Supply the engines (and APU) with fuel
 Transfers fuel between tanks
 And, not simulated, cool the integrated drive generator and control the refueling operations.
 Note there is no fuel dumping possible on A320/321
TANKS
Two wing tanks and one center tank store the fuel, with a vent surge tank in each wing tip.
USABLE FUEL
WING TANKS
CENTRE TANK
TOTAL
VOLUME
2 X 7750 LITERS
2 X 2047 US GALLONS
8800 LITERS
2166 US GALLONS
23700 LITERS
6260 US GALLONS
WEIGHT
2 X 6048 KG
2 X 13,140 LB
6437 KG
14,190 LB
18605 KG
41,010 LB
ENGINE FEED
The main fuel pumps feed fuel from the wing tanks to the engines using two fuel pumps in each wing tank.
MAIN COMPONENTS
 Tank pumps, two in each wing tank, normally both activated.
 Cross feed valve, allows the left and right systems to be connected and to feed both engines from one
wing tank, normally closed.
 Engine low pressure valves, when closed (by using the engine master switch or the ENG FIRE PUSH
button) they cut the fuel flow to the engine, normally open.
 Suction valves, when open they allow the engines to be gravity-fed from the wing tanks. Normally the
fuel pump action will close these valves.
FUEL FEED SEQUENCE
 During engine start (and for 2 minutes after engine start) engines are fueled from the wing tanks.
 When slats are extended engines are fueled from the wing tanks.
 When wing tanks are full engines are fueled from the wing tanks (to allow fuel expansion) until an ‘under
level’ sensor is triggered. While engines are fueled from the wing tanks, fuel is transferred from the
center tank to the wing tanks. When the inner wing tank reaches 750 kg of fuel, the outer wing tank fuel
content will be transferred to the inner tanks.