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batteries are on (default). The battery
voltage is displayed next to each switch.
3.4.Generator switches. They are dark when in
use. They are in fault when the corresponding
engine is not running. An ‘OFF’ white light is
visible if a generator is turned off.
5. APU Generator. This switch controls the
electric power that comes from the APU. It
is on by default.
6. When an external power is available, a
green ‘AVAIL’ light turns on. The crew can
then press this button to use this
electricity source and ‘ON’ appears in blue.
SYSTEMS
Airbus Series Vol.1
(c) 2007 Wilco Publishing www.wilcopub.com - www.FeelThere.com 49
Batteries
This aircraft is equipped with 2 batteries that
can provide electricity for a limited time. As
soon as an external source is provided, the
batteries are charged if necessary.
Each battery voltage is displayed on the
overhead panel. When the aircraft is cold and
dark, the batteries should be turned on first,
even if a ground power unit is available.
Auxiliary Power Unit (APU)
The APU is capable of providing electricity for
the aircraft. A specific section is dedicated to
the APU later in this chapter.
When the aircraft is cold and dark and no ground
power unit is available, the APU should be
turned on as soon as possible because batteries
can only provide electricity for a limited time.
Generators
The generators provide electricity from the
engine rotation. As soon as an engine is
started, its generator can be used to provide
electricity to the aircraft and the APU and GPU
can be turned off.
When the engines are stopped, the generators
are in fault mode because no energy can be
provided. When the engines start, make sure
the generators are turned on.
Ground Power Unit (GPU)
When the aircraft is parked on the ground, a
ground power unit can be connected to the
aircraft to provide electricity without needing
to burn any fuel.
This is simulated in this aircraft. When you are
parked on the ground, with parking brakes set
and engines stopped, the ground power unit is
available 1 minute after the engines have
stopped. The external power (EXT PWR)
switch then shows the GPU is available.
At this time, the crew can press the EXT PWR
switch to use this energy source. A blue ‘ON’
light then appears on the EXT PWR switch.
As soon as the aircraft moves on the ground,
the external power becomes unavailable.
ELEC Page
The electric circuits can be monitored through
the ELEC page.
1. The white boxes show each battery status,
with voltage and current.
2. Generators associated to engines 1 and 2.
Each white box shows the generator load,
the voltage and the frequency (amber XX
are shown if the corresponding engine is
stopped).
3. APU GEN : This box is visible as soon as the
APU is running and the APU GEN switch is on.
4. EXT PWR : This box is visible as soon as a
GPU is available and provides electricity.
Possible Electric Configurations
The generators provide energy with the
highest priority. In flight, the standard
configuration is shown in the following image,
with batteries and generators on, APU and
GPU off:
SYSTEMS
Airbus Series Vol.1
50 For Microsoft Flight Simulator use only. Not for use in real aviation.
In case of an engine failure, the associated
generator can not provide energy any more. The
other engine provides AC current to the whole
sytem:
If the generators are off or the engines are
stopped (when parked on ground for example),
the external power source (GPU) has the
priority. If it is not available, it is assumed the
APU will provide energy, as shown here:
As soon as the external power becomes available
and is selected by the crew as the energy source,
it takes the priority over the APU. The APU source
is still available, but not used :
Alerts & Warnings
Message Color Reason
ELEC BAT 1 OFF Amber Battery 1 has been turned off
ELEC BAT 2 OFF Amber Battery 2 has been turned off
ELEC GEN 1 OFF Amber Generator 1 is off
while engine 1 is running
ELEC GEN 2 OFF Amber Generator 2 is off
while engine 2 is running
HYDRAULICS
The hydraulic system is controlled through the
‘HYD’ section of the overhead panel.
This aircraft has 3 independent hydraulic
circuits for redundancy, designated Green, Blue
and Yellow. Green and Yellow circuits are
associated to engines 1 and 2 and the Blue
circuit is pressurized by an electric hydraulic
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