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port (5th stage) of the compressor. An intermediate pressure check valve, located in
the engine nacelle, prevents reverse flow into the engine compressor 5th stage.
When the pressure is insufficient at the low-pressure port, the HPV is signaled to open
by the BMC and air from the high-pressure port (8th stage) drives the intermediate
pressure check valve closed.
NOTE
The BMC will control the bleed pressure (high or low) when
either AUTO or ON is selected.
L ENG BLEED
AUTO
OFF ON
L ENG BLEED
AUTO
OFF ON
OR
LP
HP
Low Press
Port
Cowl A/Ice Valve
Pressure-
Regulating
Valve (PRV)
High
Press
Port
HPV
Pressure-
Regulating
Valve
(PRV)
Intermediate
Pressure
Check Valve
Cowl A/Ice
Valve
Low
Press
Port
LEFT ENGINE
GX_13_007
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-10 For Training Purposes Only
Sept 04
A Crossbleed Valve (CBV) is installed between the left and right pneumatic ducts
which can be opened either automatically by the BMC or manually through the OPEN
selection to provide bleed air from one side to the other (i.e. for engine starting). Refer
to Chapter 17, POWER PLANT for more information.
R ENG BLEED
AUTO
OFF ON
R ENG BLEED
AUTO
OFF ON
OR
LP
HP
High Press
Valve (HPV)
High Press Port
RIGHT ENGINE
GX_13_008
AUTO
CLSD OPEN
XBLEED
AUTO
CLSD OPEN
XBLEED
OR
APU
START
L
OFF
R
OFF
45
PSI
45
PSI
Start
Valve
CBV
Note:
START icon disappears after selected engine is IDLE and flow lines and start valve
disappear after both engines started.
LP
HP
GX_13_009
LP
HP
For Training Purposes Only
Sept 04
13-11
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
APU BLEED AIR
The APU can be used on the ground and in the air to supply the pneumatic system for
air conditioning or engine starting. Opening the Load Control Valve (LCV),
automatically by the BMC or manually through the ON selection, allows air from the
APU to feed the left pneumatic duct. The air pressure delivered in the pneumatic duct
is displayed on the synoptic page in psi.
NOTE
APU bleed air volume is insufficient to supply the wing anti-ice
system.
Opening the crossbleed valve (CBV), automatically by the BMC or manually through
the ON selection, allows air from the APU to feed the right pneumatic duct.
APU BLEED
AUTO
OFF ON
APU BLEED
AUTO
OFF ON
LP
HP
L
AIR
COND
R
OFF
40
PSI
0
PSI
LP
HP
APU
Load Control Valve
Pressure
Readout
OR
GX_13_010
AUTO
CLSD OPEN
XBLEED
AUTO
CLSD OPEN
XBLEED
OR
LP
HP
L R
40
PSI
40
PSI
LP
HP
APU
LP
HP
L
OFF
R
OFF
0
PSI
0
PSI
LP
HP
APU
Handle Pulled DISCH
PULL
1 2
A
P
U
GX_13_011
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-12 For Training Purposes Only
Sept 04
The APU FIRE DISCH handle, when pulled, will close the LCV. Refer to Chapter 9,
FIRE PROTECTION for more information.
NOTE
Engine bleed has priority over APU bleed and MAN has priority
over AUTO. If both PRVs are open (i.e. engines running), the
BMC will automatically close the LCV and the CBV (APU BLEED
and XBLEED in AUTO).
BLEED LEAK DETECTION
Hot air leaks are monitored in the airplane by dual loop continuous bleed leak
detection sensing elements, routed along the airplane ducts. Each dual loop consists of
loop A and loop B. Loop A is connected to the left BMC monitoring channel and loop
B is connected to the right BMC monitoring channel.
Leak detection elements consist of two concentric tubes. The space between the tubes
is filled with an insulated eutectic salt. During temperature increase, the salt becomes
conductive and the measured resistance between the tubes drops suddenly, triggering
an EICAS message.
For Training Purposes Only
Sept 04
13-13
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
BMC1 BMC2
LEGEND:
BMC
Valve + Duct
Leak Detection Loop
Link Loop > Controller
　
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