The AC ESS BUS is normally supplied from AC BUS 1.
It may be supplied by AC BUS 2, via the AC ESS FEED pushbutton .
NORMAL : AC ESS BUS is supplied by AC BUS 1.
ALTN : AC ESS BUS is supplied by AC BUS 2.
FAULT lt : The amber light, and ECAM caution come on, when the AC ESS BUS is not
electrically-supplied.
Note: In case of a total loss of main generators, the AC ESS BUS is
automatically supplied by the emergency generator, or by the static
inverter, if the emergency generator is not available.
(8) GALY & CAB pushbutton
AUTO : Main galley, secondary galley, in-seat power supply and IFE system
(prerecorded announcement, telephone system, video/airshow, music …) are
supplied.
The above-mentioned equipment is automatically shed :
In flight : When only ‐ one generator is operating.
‐ On ground : When only one engine generator is operating. (All galleys are
available when the APU GEN or EXT PWR is supplying power.)
OFF : The main galley, secondary galley, in-seat power supply and IFE system
are not supplied.
FAULT lt : The amber light, and ECAM caution come on, when the load on any
generator is more than 100 % of rated output.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 20/44
FCOM 19 AUG 10
(9) EXT PWR pb (momentary action)
AVAIL light comes on green, if :
‐ External power is plugged in, and
‐ External power parameters are normal.
Pressed momentarily :
‐ If the AVAIL light was on :
• The external power line contactor closes.
• The AVAIL light goes off.
• The ON light comes on blue.
‐ If the ON light was on :
• The external power line contactor opens.
• The ON light goes off.
• The AVAIL light comes on.
Note: 1. External power has priority over the APU generator. The engine generators have
priority over external power.
2. The ON light stays on, even when the engine generators supply the aircraft.
(10) COMMERCIAL pb sw
ON : All aircraft commercial electrical loads are supplied :
‐ cabin and cargo lights
‐ water and toilet system
‐ drain mast ice protection
‐ galley
‐ passengers' entertainment
‐ semi-automatic cargo loading (if installed)
OFF: Switches off all aircraft commercial electrical loads.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 21/44
FCOM 19 AUG 10
OVERHEAD PANEL (CONT'D)
Applicable to:
(1) MAN ON pb (guarded)
AUTO : When the following conditions are met :
• AC BUS 1 is not electrically supplied.
• AC BUS 2 is not electrically supplied.
• Aircraft speed is greater than 100 kt.
‐ The RAT extends.
‐ The blue hydraulic system drives the emergency generator.
‐ As soon as the emergency generator electrical parameters are within tolerance
and the landing gear is retracted, the emergency generator is connected to the
aircraft network.
Pressed : This selects manual RAT extension.
Emergency generator coupling occurs 3 s after the RAT supplies the emergency
generator.
(2) FAULT lt
This light comes on red if the emergency generator is not supplying power when
‐ AC BUS 1 and AC BUS 2 are not powered and,
‐ Nose landing gear is up.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 22/44
FCOM 19 AUG 10
(3) EMER GEN TEST pb (guarded)
Pressed and held :
• If AC NORMAL BUSES are supplied :
The EMER GEN is driven hydraulically ‐ if the blue electric pump is running.
The AC ESS BUS and the DC ESS BUS are connected to the emergency generator.
(The DC ESS SHED and AC ESS SHED buses are not powered.)
‐ ECAM displays the ELEC page automatically (only on the ground).
• If only the batteries supply the aircraft :
‐ The static inverter powers the AC ESS BUS.
(4) GEN 1 LINE pb sw
OFF : GEN 1 line contactor opens.
The AC BUS 1 channel is supplied from GEN 2 through bus tie contactors. This is
used for smoked drill.
SMOKE
lt
: (Refer to DSC-26-30-20 OVERHEAD PANEL)
OVERHEAD PANEL (CONT'D)
Applicable to:
,
,
MSN,,,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-24-20 P 23/44
FCOM 19 AUG 10
(1) MAN ON pb (guarded)
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