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batteries.
The two batteries are used for starting the APU and providing power when other sources are unavailable. The batteries automatically
charge from DC BAT bus when their voltage is below a certain level. Before ight, you must ensure that the batteries are
charged above 26 volts.
Controls and indications
ECAM ELEC page
The ECAM ELEC page shows electrical sources, buses, and power ow.
Each bus is represented by a gray rectangle with the name of the bus. The name
is green when bus is powered, and amber when bus is unpowered.
AC generators - GEN1, GEN2 and APU GEN - are shown as white boxes.
Listed are generator load percentage, voltage and frequency. When a generator
is selected OFF, this is indicated by white “OFF”. EXT PWR box, when available,
shows voltage and frequency.
Transformer-rectier units (TRs) are shown as TR1 and TR2, listing output
voltage and amperage.
Two battery indications show voltage and current.
Power ow is indicated by green lines, connecting power sources to the buses.
When the batteries are connected, green arrows to or from DC BAT bus indicate
charging or discharging.
A319/320/321
Systems Manual
Phoenix Simulation Software P 73
REV 01 SEQ 001 Electrical system
Controls and indications (continued)
ELEC control panel (overhead)
 BAT ƒ AC ESS FEED
„ GEN … APU GEN
† BUS TIE
‡ EXT PWR
ˆ GALY & CAB
‚ Bat voltage
 BAT
The BAT buttons control the connection/disconnection of the corresponding battery to the aircraft electrical system.
NO LIGHT: Auto, a battery is automatically connected by the system logic for providing power or recharging.
OFF: A battery is manually disconnected.
‚ Bat voltage
The LCD windows show battery voltage. The readouts are always powered, and can be read without applying any power to
the aircraft.
ƒ AC ESS FEED
Controls the selection of power source for AC essential bus.
NO LIGHT: Default, AC ESS is powered by AC1 bus.
ALTN: AC ESS is powered by AC2 bus.
„ GEN
Allows to manually disconnect engine 1 or 2 generator from the system.
NO LIGHT: Default, a generator is connected to the electrical system if an engine is running and electrical parameters are normal.
OFF: A generator is disconnected from the electrical system.
“FAULT” light is illuminated when a generator is selected ON and is not providing power. This is normally seen prior to engine
start.
… APU GEN
Allows to manually disconnect APU generator from the system.
NO LIGHT: Auto, APU generator is automatically connected to the electrical system when APU is running, electrical parameters
are normal and there are no higher-priority power sources available (Engine generator or EXT PWR).
OFF: APU generator is disconnected from the electrical system.
† BUS TIE
Controls the bus tie logic.
NO LIGHT: Auto, the bus tie automatically splits or connects the two AC buses to provide single source to each bus.
OFF: The bus tie opens, and the two AC buses are isolated.
‡ EXT PWR
Used for selection and deselection of external power. If external power is plugged to the aircraft and power parameters are in
normal range, the green “AVAIL” light illuminates. In the PSS Airbus panel, the external power is always available when engines
are shut down and parking brake is set.
Pushing the button when AVAIL light is on connects external power source to the electrical system. Blue “ON” light is illuminated,
and “AVAIL” light extinguishes.
Pushing the button again with EXT PWR connected (“ON” illuminated) disconnects the external power from the system (it stays
physically plugged to the aircraft though, and is disconnected by ground personnel).
ˆ GALY & CAB
Controls power supply to the main galley bus.
NO LIGHT: Auto, the galley is powered unless it is automatically shed by the system logic.
OFF: Removes electrical power to all galley equipment.
A319/320/321
Systems Manual
Phoenix Simulation Software P 74
REV 01 SEQ 001 Fuel system
Overview
The fuel is contained in one center and two wing tanks. The center tank is generally lled last and used rst. The wing tanks are
divided into outer and inner cells by sealed ribs with transfer valves installed.
The fuel is drawn by fuel pumps. There are two pumps in center tank and each wing tank inner cell. The operation of fuel pumps
is fully automatic. The wing tank fuel pumps are always used to supply fuel to the engines during takeoff and landings; center tank
pumps are automatically deactivated when slats are extended.
　
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