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BMC #1
CHANNEL A
CONTROL
CHANNEL B
MONITORING
BMC #2
CHANNEL A
CONTROL
CHANNEL B
MONITORING
DISCRETES
DAU1
CHA CHB
DAU2
CHA CHB
DAU3
CHA CHB
DAU4
CHA CHB TOTAL FUEL (LBS) 41550
1.54 1.54
73.3 73.3
789 789
14600 10000 14600 ND
STAB
NU
NL RUDDER
LWD RWD
NR
TRIMS
7.2
N2
FF (PPH)
OIL TEMP
OIL PRESS
93.4
5750
115
81
93.4
5750
115
81
EPR
N1
ITT
AIL
1.65 1.65
CRZ
SYNC
LP
HP
L R
HP
LP
COND
AIR
BLEED/ANTI−ICE
APU
40
PSI
40
PSI
ASCB
XBLEED
AUTO
CLSD OPEN
L ENG BLEED
AUTO
OFF ON
R ENG BLEED
AUTO
OFF ON
APU BLEED
AUTO
OFF ON
For more information on anti-ice, see Chapter 14, ICE & RAIN PROTECTION.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 12, Aug 14, 2006
CSP 700−5000−6
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 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−9
BLEED AIR SYSTEM (CONT'D)
Engine Bleed Air (Cont’d)
A cross−bleed 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 2A, Apr 11, 2005
CSP 700−5000−6
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
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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