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AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−8
BLEED AIR SYSTEM (CONT'D)
Engine Bleed Air
The BMC selects air from either the low pressure port or high pressure port on the engine,
depending on the pressure available. The Pressure Regulating Valve (PRV) limits the pressure
supplied to 43±3 psig.
Under normal operating conditions (inflight), the air is bled from the 5th stage of compression (low
pressure port). An intermediate pressure check valve, located in the engine nacelle, prevents
reverse flow into the engine compressor 5th stage.
GF0210_007
LOW PRESS
PORT
HIGH PRESS PORT
PRV
HPV
COWL A/ICE VALVE
LOW PRESS PORT
PRESSURE
REGULATING
VALVE (PRV)
CHECK
or VALVE
NOTE
The BMC will control the bleed pressure (high or low) when either AUTO or ON is selected.
Left Engine
COWL
A/ICE
VALVE
LP
HP
L ENG BLEED
AUTO
OFF ON
L ENG BLEED
AUTO
OFF ON
When the pressure is insufficient at the low pressure port, the HPV is signaled to open by the BMC
and air from the 8th stage of compression (high pressure port) drives the intermediate pressure
check valve closed.
GF0210_008
HIGH PRESS PORT
HIGH PRESS
VALVE (HPV)
Right Engine
LP
HP or
R ENG BLEED
AUTO
OFF ON
R ENG BLEED
AUTO
OFF ON
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−9
BLEED AIR SYSTEM (CONT'D)
Engine Bleed Air (Cont’d)
A Crossbleed valve (CBV) is installed between the left and right pneumatic ducts which can be
opened, automatically by the BMC or manually through the OPEN selection, to provide bleed air
from one side to the other, for example engine starting. For more information, see Chapter 18,
POWER PLANT.
GF0210_009
or
NOTE
START icon disappears after start valve closes. Flow lines
and start valve disappear after both engines started.
CBV
START VALVE
45 45
PSI
R
PSI
L
OFF
APU
HP
LP
HP
LP
START
XBLEED
AUTO
CLSD OPEN
XBLEED
AUTO
CLSD OPEN
The L (R) FIRE DISCH handles, when pulled, will close the affected PRV and the BMC will close
the affected HPV. For more information, see Chapter 9, FIRE PROTECTION.
GF0210_010
HANDLE PULLED
ENGINES RUNNING−HP SOURCE ACTIVE
BMC
LP
HP
L R
APU
HP
LP
COND
LP
HP
L R
APU
HP
LP
COND
0
PSI
45
PSI
45
PSI
45
PSI
DISCH
PULL
1 2
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.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
02−10−10
BLEED AIR SYSTEM (CONT'D)
APU Bleed Air (Cont’d)
The air pressure delivered in the pneumatic duct is displayed on the synoptic page in PSI.
GF0210_011
PSI
0
PSI
40
LP
AIR
COND
HP
L
LP
HP
LOAD CONTROL VALVE
PRESSURE READOUT
NOTE
APU bleed air volume is insufficient to supply the wing anti−ice system.
R
OFF
or APU
APU BLEED
AUTO
OFF ON
APU BLEED
AUTO
OFF ON
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.
GF0210_012
HANDLE PULLED
LP
HP
L R
APU
HP
LP
40
PSI
LP
HP
L R
APU
HP
LP
0
PSI
0
PSI
OFF OFF
40
PSI
DISCH
PULL
1 2
or
XBLEED
AUTO
CLSD OPEN
XBLEED
AUTO
CLSD OPEN
The APU FIRE DISCH handle, when pulled, will close the LCV. For more information, see Chapter
9 FIRE PROTECTION.
NOTE
Engine bleed has priority over APU bleed and MAN has priority over
AUTO.
If both PRVs are open (engines running), the BMC will automatically
close the LCV and the CBV, if LCV and CBV are in AUTO or Manual.
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