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System Presentation 4/28
Pneumatic
System
BMC 1 BMC 2
The pneumatic system is controlled
and monitored by 2 Bleed Monitoring
Computers (BMC).
There is one BMC for each engine
bleed system.
Both BMC are interconnected and if
one fails, the other takes over most of
its functions.
PNEUMATIC MENU
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BMC 2
There are air leakage detection
loops installed in the vicinity of the hot
air ducts in the fuselage, wings and
pylons.
If a leak is detected, a signal is sent
to the BMC which automatically isolate
the affected area.
BMC 1
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In flight, the primary source for high
pressure air is the engines.
Both engines bleed systems are
similar.
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Air is bled from two compressor stages
of the engine, the Intermediate Pressure
(IP) port and the High Pressure (HP) port.
IIPP HHPP
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There is a HP valve which can cut off
bleed air from the high pressure port.
It is automatically controlled by the
system.
IP HP
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The High Pressure section (HP) is only
used when there is insufficient pressure
from the Intermediate output (IP), i.e.
when the engines are at idle.
Once the engine speed is high enough,
the IP pressure is sufficient and the HP
valve closes.
IP HP
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The air extracted from the compressor
then goes to a bleed valve which acts as a
shut off and pressure regulating valve.
IP HP
BLEED
VALVE
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Since the temperature of the bleed air is
high, it passes through a precooler before
being distributed to the users.
The precooler uses cool air from the
engine fan to regulate the temperature.
IP HP
BLEED
VALVE
Precooler
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ENG 2 has an identical BLEED
SYSTEM.
IP HP
BLEED
VALVE
Click on the blue box to
display the engine 2 bleed
system.
Precooler
ENG 1
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IP HP
BLEED
VALVE
Precooler
ENG 1
HP IP
BLEED
VALVE
Precooler
ENG 2
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System Presentation 14/28
IP HP HP IP
BLEED
VALVE
BLEED
VALVE
Both systems are connected by a
crossbleed duct.
A crossbleed valve permits their
interconnection or isolation.
X BLEED
VALVE
Precooler Precooler
ENG 1 ENG 2
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IP HP HP IP
BLEED
VALVE
BLEED
VALVE
The APU can also be used for
BLEED air supply.
This is usually done on ground for
air conditioning and for engine start.
However, APU BLEED air is also
available in flight.
X BLEED
VALVE
APU
Precooler Precooler
ENG 1 ENG 2
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IP HP HP IP
BLEED
VALVE
BLEED
VALVE
APU BLEED air is controlled by the
APU bleed valve which operates as a
shut off valve.
X BLEED
VALVE
APU BLEED
VALVE
APU
Precooler Precooler
ENG 1 ENG 2
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ENG 1 ENG 2
APU
GPU
IP HP HP IP
BLEED
VALVE
BLEED
VALVE
X BLEED
VALVE
Should the APU not be available,
a high pressure ground power unit
can be connected.
This completes the pneumatic
system. We will now show you how
system information is displayed to the
pilots.
APU BLEED
Precooler VALVE
Precooler
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System Presentation 18/28
APU
IIP HP HP IIP
PPrreeccoooolleerr PPrreeccoooolleerr
GND
The pneumatic system is displayed
on the ECAM BLEED page.
Click on the diagram to display
the ECAM BLEED page...
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APU
IIP HP HP IIP
PPrreeccoooolleerr PPrreeccoooolleerr
GND
Information on the pneumatic
system is displayed on the lower part
of the ECAM BLEED page.
Note : we have shaded the upper
part of the ECAM BLEED page
because it is related to the AIR
CONDITIONING chapter. This will be
covered in a later module.
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Let’s identify the system
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空客a320飞机概述2(84)
