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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 cross−bleed 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.
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−11
BLEED AIR SYSTEM (CONT'D)
Bleed Leak Detection
Hot air leaks are monitored in the airplane by dual loop continuous fire 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. In case of temperature increase, the salt becomes conductive and
the measured resistance between the tubes drops suddenly, triggering an EICAS message.
FGF0210_009
INBOARD LEFT
WING LOOP
BMC1 BMC2
VALVE + DUCT
LEAK DETECTION LOOP
LINK LOOP CONTROLLER
(LOOP READ BY BMC)
OUTBOARD LEFT
WING LOOP
OUTBOARD RIGHT
WING LOOP
INBOARD RIGHT
WING LOOP
RIGHT ANTI−ICE
DUCT LOOP
WAIV1 WAIV2
TRIM AIR VALVES
TRIM AIR
LOOP
FCV1 FCV2
HASOV1 HASOV2
LEFT BLEED
LOOP
RIGHT BLEED
LOOP
CBW
CBV
PRV1 PRV2
GROUND
CONNECTOR LCV
LEFT ANTI−ICE
DUCT LOOP
CBW − Wing CrossBleed
Valve
FCV − Flow Control Valve
HASOV− Hot Air Shut−off Valve
LCV − Load Control Valve
PRV − Pressure Regulating Valve
WAIV − Wing Anti−ice Valve
LEGEND
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
02−10−12
BLEED AIR SYSTEM (CONT'D)
Bleed Leak Detection (Cont’d)
When a leak is detected, a message is displayed on EICAS and the BMC will automatically close
the affected PRV, the CBV and wing antiice
pressure regulating shutoff
valve (WAIV), to isolate
and stop the leak.
GF0210_014
PRV
CBV
WAIV
R BLEED LEAK
LP
HP
L R
APU
HP
LP
COND
AIR
BLEED/ANTI−ICE
40
PSI
0
PSI
AIR CONDITIONING AND PRESSURIZATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
02−10−13
AIR CONDITIONING CONTROLS
Controls are provided on the Air Conditioning Control Panel, located on the overhead panel.
GF0210_015
TRIM AIR Switch
Used to inhibit trim
air.
− Indicates trim
air is selected off.
RAM AIR Switch
Used to provide
ambient air to ventilate
the cockpit and cabin,
in the event of dual
PACK failure.
− Ram air vent
valve has been
selected open.
PACK CONTROL Selector
Used to enable Air Conditioning System
Controllers (ACSC) which measure, calculate
and control the airflow and all auto features.
NORM
LO
HIGH
MAN
(ACSC is d i s a b l e d ).
HOT/COLD Toggle
Switches
Used to control
PACK outlet
temperature in
manual mode.
TEMPERATURE Selectors
Used to select desired
temperature for the cockpit
and cabin.
RECIRC Switch
Used to inhibit
recirculation of
conditioned air.
− Indicates
recirculation has
been selected off.
AUX PRESS Switch
Used to control
alternate air source,
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