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INTEGRATED AIR MANAGEMENT SYSTEM
TEMPERATURE CONTROL - MAN
NOTE
To avoid overshooting desired temperature, do not toggle for
more than two seconds duration.
GX_13_039
Temperature
Control Valve
(TCV)
PLENUM
BLEED
AIR
PACK CONTROL
NORM
MAN
LO HIGH
L PACK R PACK
FAIL
OFF
FAIL
OFF
Select one
pack OFF
RAM AIR
BLEED BLEED
R PACK
MAN
L PACK
OFF
PACK CONTROL
NORM
MAN
LO HIGH
L PACK R PACK
FAIL
OFF
FAIL
OFF
Pack control
manual
RAM AIR
BLEED BLEED
R PACK
MAN
L PACK
MAN
RAM AIR
BLEED BLEED
R PACK
MAN
L PACK
MAN
BLEED/AIR COND
RECIRC TRIM AIR
OFF OFF
RAM AIR
ON
Trim Air OFF
L MAN
TEMP
R MAN
TEMP
AUX PRESS
HOT
COLD
HOT
COLD
ON
Manual Temperature Control activates
the TCV. The objectives is to maintain
the pack discharge temperature between
5°C and 60°C
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-38 For Training Purposes Only
Sept 04
AIR CONDITIONING BLEED LEAK DETECTION
When a leak is detected, a message is displayed on EICAS and the BMC will
automatically close the affected valves to isolate and stop the leak.
R BLEED LEAK
AIR CONDITIONING
RAM AIR
BLEED
TRIM AIR
BLEED
LOW HIGH
12 °C 12 °C
23 °C 23 °C 23 °C
L PACK
CKPT
20°C
19°C 21°C 22°C
FWD
20°C
AFT
23°C
FCV
HASOV
GX_13_040
R PACK
For Training Purposes Only
Sept 04
13-39
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
PRESSURIZATION
The Cabin Pressure Control System (CPCS) is an electrical system except for pressure
relief function. The CPCS is composed of two controllers, two electrical Outflow
Valves (OFV), two Safety Valves (SFV), and an electrical control panel.
The CPCS includes three independent control channels:
• Two identical, independent and AUTO channels are available from the two digital
Cabin Pressure Controllers (CPC). Either CPC drives both electrical OFVs in turn
• One MANUAL control channel performs the control of both OFVs. The control is
done by moving a toggle switch, located on the Cabin Pressurization Control
Panel, to raise or lower the cabin altitude
The cabin is controlled to an altitude of no more than 7,230 feet at 51,000 feet aircraft
altitude and no more than 6,000 feet when flying at 45,000 feet.
The CPCS allows for two cabin rate selections in automatic control:
• NORMAL Provides 500 feet per minute (ft/min) cabin climb and
300 ft/min descent rate
• HIGH Provides 0 to 800 ft/min descent rate
The system includes safety devices which override AUTO and MANUAL mode for
OFV travel limitation, cabin limitation, and differential pressure limits.
In both AUTO and MANUAL modes the CPCS provides indication of cabin pressure
parameters on the STATUS page and any failures are displayed on the EICAS.
PRESSURIZATION
CONTROL
PANEL
OUTFLOW
VALVE
OUTFLOW
VALVE
CABIN PRESSURE
CONTROLLER
CABIN PRESSURE
CONTROLLER
SAFETY
VALVE
SAFETY
VALVE
DAU
DAU
GX_13_041
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-40 For Training Purposes Only
Sept 04
The CPCS can rapidly depressurize the cabin through an EMER DEPRESS switch on
the Pressurization Control Panel. Additionally, a DITCHING switch performs the
shutdown of both packs and depressurizes the cabin prior to closing both OFVs.
Controls are provided on the Pressurization Control panel located on the overhead
panel.
OUTFLOW VALVE
MAN PRESSURIZATION AUTO
MAN ALT LDG ELEV RATE
1
CLOSED
2
CLOSED
AUTO/
MAN
MAN
EMERG
DEPRESS
ON
DITCHING
ON
MAN
FMS
UP
DN
HIGH
NORM
UP
DN
ATE
H
LD
M
D D
RATE Switch
HIGH
NORM
Used to select cabin climb rate of change.
Up to 800 fpm descent.
500 fpm up and 300 fpm descent.
–
–
MAN ALT Toggle Switch
UP
DN
MID
Used to control cabin altitude in
manual mode.
– Commands cabin to climb
Commands cabin to
descend.
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