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and landing.
PPaacckkInInlelettSSccoooopp OOuutltelettDDuucctt
Pack
Controller
MENU
AIR CONDITIONING System Presentation 10/40
To make things simpler let’s define the area within the
yellow box as a pack.
AAirirCCoonndditiitoionnininggPPaacckk
MENU
AIR CONDITIONING System Presentation 11/40
Pack 1 Pack 2
AAirirCCoonndditiitoionnininggPPaacckkss
CCooool lCCoonndditiitoionneeddAAirir
The two Air Conditioning Packs operate automatically
and independently to provide cool conditioned air.
HOT BLEED AIR
MENU
AIR CONDITIONING System Presentation 12/40
MMixixininggUUnnitit
Pack 1 Pack 2
The Conditioned Air from the packs is then fed to a
Mixing Unit.
MENU
AIR CONDITIONING System Presentation 13/40
Ram Air
MIXING UNIT
Pack 1 Pack 2
Ram Air
Valve
Ram Air
Valve
In case of failure of both packs Ram Air is provided via a
Ram Air Valve. We will look at the use of RAM AIR in the
Abnormal operation module.
MENU
AIR CONDITIONING System Presentation 14/40
o
5 C o
PACK OUTLET 15 C
TEMP
PACK OUTLET
TEMP
BYPASS VALVE
POSITION
BYPASS VALVE
POSITION
o
120 C o
115 C COMPRESSOR
OUTLET TEMP
COMPRESSOR
OUTLET TEMP
PACK FLOW PACK FLOW
Ram Air
MIXING UNIT
Pack 1 Pack 2
• Pack flow
• Compressor Outlet Temperature
• Bypass Valve Position
• Pack Outlet temperature
Various pack parameters are monitored by ECAM.
They are;
MENU
AIR CONDITIONING MENU System Presentation 15/40
o
5 C o
PACK OUTLET 15 C
TEMP
PACK OUTLET
TEMP
BYPASS VALVE
POSITION
BYPASS VALVE
POSITION
o
120 C o
115 C COMPRESSOR
OUTLET TEMP
COMPRESSOR
OUTLET TEMP
PACK FLOW PACK FLOW
Ram Air
MIXING UNIT
Pack 1 Pack 2
AIR CONDITIONING System Presentation 16/40
[][][][][][] [][]
These parameters, along with the valve positions, are
displayed on the upper part of the ECAM BLEED page.
MENU
AIR CONDITIONING System Presentation 17/40
ECAM BLEED Page
Having discussed the Air Conditioning Packs we will
now look at how temperature and flow regulation is
achieved throughout the aircraft.
MENU
AIR CONDITIONING System Presentation 18/40
TThhrereeeTTeemmppeeraratuturereZZoonneess
Mixing Unit
The three outputs from the mixing unit feed three
separate aircraft Zones, Cockpit, Forward Cabin, and Aft
Cabin.
Let’s look at how the temperature of the zones is
managed.
Pack
1
Pack
2
MENU
AIR CONDITIONING System Presentation 19/40
Mixing Unit
A Zone Control Computer monitors the temperatures of
the three zones and sends signals to the Pack
Controllers to set the air temperature delivered by the
packs.
Pack
1
Pack
2
Pack
Controller
Pack
Controller
Zone Control
Computer
MENU
AIR CONDITIONING System Presentation 20/40
Mixing Unit
Normally cold air is delivered by the packs and is then
sent to the three zones.
Pack
1
Pack
2
CCooldldAAirir
MENU
AIR CONDITIONING System Presentation 21/40
Hot
Bleed Air
HOT
AIR
TTrirmimAAirirVVaalvlveess
Mixing Unit
Since the different areas of the aircraft may require
different amounts of cooling, or heating, hot bleed air can
be added via Trim Air Valves to achieve the demanded
temperature for a zone.
Pack
1
Pack
2
MENU
AIR CONDITIONING MENU System Presentation 22/40
Hot
Bleed Air
HOT
AIR
Mixing Unit
Pack
1
Pack
2
AIR CONDITIONING MENU System Presentation 23/40
Hot
Bleed Air
HOT
AIR
Mixing Unit
Pack
1
Pack
2
AIR CONDITIONING System Presentation 24/40
In the example shown:
• no hot air is being added to
the Cockpit zone .
• some hot air is being
added to the Forward Cabin
zone,
• a lot of hot air is being
added to the Aft Cabin zone.
Hot
Bleed Air
HOT
AIR
Mixing Unit
Pack
1
Pack
2
MENU
AIR CONDITIONING System Presentation 25/40
Hot Air
Valve
Hot Air
Valve
The Trim Air Valves are supplied via a Hot Air Valve. The
purpose of this valve is to regulate the pressure of the
hot air supplied to the trim system and to act as a shut
　
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