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zone as an example.
MENU
AIR CONDITIONING Normal Operation 39/69
The Cockpit zone temperature selector is in the 12
o’clock position.
In this position, a zone temperature of approximately 24
degrees Celsius is demanded.
MENU
AIR CONDITIONING Normal Operation 40/69
As the 15 degrees Celsius of the cockpit zone is well
below the demanded 24 degrees, the zone controller
sends a command to increase the amount of hot air
added.
MENU
AIR CONDITIONING MENU Normal Operation 41/69
AIR CONDITIONING MENU Normal Operation 42/69
AIR CONDITIONING Normal Operation 43/69
Due to this command;
• the trim air valve opens,
• the zone duct temperature increases and so, warm air is
supplied to the cockpit zone,
• the cockpit zone starts to warm up.
MENU
AIR CONDITIONING Normal Operation 44/69
Once the Cockpit zone reaches the demanded
temperature the trim air valve will move reducing the
amount of hot air. And then will move as required to
maintain the zone temperature.
MENU
AIR CONDITIONING Normal Operation 45/69
It is now time to start the engines. So that you can
watch what is happening let’s go back to the ECAM
BLEED page.
Note; Normally the ENGINE page is displayed during
engine start. For training purposes we will display the BLEED
page. Call the ECAM BLEED page.
MENU
AIR CONDITIONING MENU Normal Operation 46/69
It is now time to start the engines. So that you can
watch what is happening let’s go back to the ECAM
BLEED page.
No, to call the ECAM BLEED page press the BLEED
pb on the ECP.
AIR CONDITIONING MENU Normal Operation 47/69
It is now time to start the engines. So that you can
watch what is happening let’s go back to the ECAM
BLEED page.
No, to call the ECAM BLEED page press the BLEED
pb on the ECP.
AIR CONDITIONING Normal Operation 48/69
Let’s start the engines. Be sure to watch the pack
valves on the ECAM BLEED page.
Click on either engine.
MENU
AIR CONDITIONING Normal Operation 49/69
As soon as the Engine Start sequence begins the Pack
Valves close. This is so that all of the APU bleed air can
be used to start the engines. Let’s complete the
sequence.
MENU
AIR CONDITIONING MENU Normal Operation 50/69
AIR CONDITIONING Normal Operation 51/69
When the engine starting sequence is completed:
• the pack valves open
• the APU bleed supplies the packs.
MENU
AIR CONDITIONING Normal Operation 52/69
Notice that the Engine bleed valves are closed, even
with both engine running. This is because APU bleed
has priority over the Engine bleed. So, if you were
departing from a performance limited runway, the packs
could run from the APU bleed air, resulting in no loss of
engine performance (no weight penalty).
MENU
AIR CONDITIONING Normal Operation 53/69
However, today, in our example, the APU is no longer
required.
Switch Off the APU Bleed.
MENU
AIR CONDITIONING MENU Normal Operation 54/69
However, today, in our example, the APU is no longer
required.
No, to switch off the APU Bleed use the APU BLEED pb.
AIR CONDITIONING MENU Normal Operation 55/69
However, today, in our example, the APU is no longer
required.
No, to switch off the APU Bleed use the APU BLEED pb.
AIR CONDITIONING MENU Normal Operation 56/69
AIR CONDITIONING MENU Normal Operation 57/69
AIR CONDITIONING Normal Operation 58/69
When the APU Bleed switch is selected off;
• the APU Bleed and Cross bleed valves close,
• the link lines disappear,
• and both engine bleed valves open supplying the packs
with bleed air.
MENU
AIR CONDITIONING Normal Operation 59/69
Notice that the Pack flow reduces. This is because the
engines provide a higher flow rate than the APU.
Also note that the Air Conditioning Control panel is
now in a Normal lights out configuration.
MENU
AIR CONDITIONING Normal Operation 60/69
When the APU is shutdown, the APU symbol on the
BLEED Page is removed.
MENU
AIR CONDITIONING Normal Operation 61/69
During the flight phase the air Conditioning
system will work automatically and the only
likely pilot input that may be required is to
adjust zone temperature. Let us assume that
you wish to cool down the cockpit.
To demonstrate, please select the cockpit zone
selector to cold.
MENU
AIR CONDITIONING MENU Normal Operation 62/69
During the flight phase the air Conditioning
system will work automatically and the only
　
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