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AIR CONDITIONING AND PRESSURIZATION
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
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.
GF0210_013
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 Crossbreed 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 41, Jul 08, 2004
CSP 700−6
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 anti-ice pressure regulating shut-off 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 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
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,
through the trim air
system, for cabin
pressurization.
− AUX PRESS
has been selected on.
L (R) PACK Switches
Used to inhibit the air conditioning units
− Indicates a PACK failure.
− PACK has been selected off.
OFF
OFF
FAIL
OFF
ON
ON
− Automatic flow control.
− Pack operates in low flow mode.
− Pack operates in high flow mode.
− Flow control valve is driven full open
TEMPERATURE
COCKPIT
COLD HOT
FWD CABIN
COLD HOT
AFT CABIN
COLD HOT
OFF OFF ON
RECIRC TRIM AIR RAM AIR
AUX PRESS
ON
HOT
COLD
L MAN
TEMP
R MAN
TEMP
HOT
COLD
LO HIGH
PACK CONTROL
NORM
MAN
R PACK
OFF
FAIL
L PACK
OFF
FAIL
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
02−10−14
AIR CONDITIONING SYSTEM
The air conditioning system is comprised of flow control valves, air conditioning units, a ram air
system, distribution system, ventilation system and auxiliary pressurization system.
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