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Spring-loaded to mid
position keeps outflow valve to
last commanded position.
–
–
AUTO/MAN Switch
MAN
Used to select mode of
operation.
Indicates MAN mode
is selected.
–
UP/DN Toggle Switch
Used to manually set landing field
altitude, up or down (feet).
MAN ALT Toggle Switch
MAN
FMS
Used to select the mode of
operation for landing elevation
Manual selection of the
landing field elevation.
FMS selects landing
field elevation.
–
–
EMER DEPRESS Switch
ON
Used to select emergency
depressurization of
airplane.
Indicates EMER
DEPRESS selected.
–
OUTFLOW VLV Switch
CLOSED
Used to select outflow
valve(s) closed.
Indicates valve
is closed.
–
DITCHING Switch
ON
Used to :
• Close outflow valves
ndicates DITCHING
selected.
• Shut off packs
• Depressurize cabin
– I
GX_13_042
For Training Purposes Only
Sept 04
13-41
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
To view pressurization data, select STAT on the EICAS Control Panel which is located
on the pedestal.
STAT
HYD
AC
ELEC
BLEED
AIR
COND
DC
ELEC
FUEL
FLT
CTRL
SCROLL
EICAS
SYSTEMS SELECT
NORM
MFD 1 MFD 2
1300
90%
13% 13%
0 . 00
20
19 20
22 22
20
CABIN (°C) CABIN (°C)
OXYGEN
CKPT (°C) AFT
OPEN OPEN
OUTFLOW VALVES
CAB ALT
CAB RATE
P
0 0
1 2
1 2
1 2
OUTFLOW VALVES Position Indicators
Displayed when MAN selected and measured in percent.
Also displayed when EMER DEPRESS selected, or
OUTFLOW VLV closed, or DITCHING selected.
MAN Mode Data Display
CAB ALT
P
CAB RATE
LDG ELEV
Displayed in feet.
Displayed in psi.
Sweep range
displayed in feet/min.
Not displayed.
–
–
–
–
AUTO Mode Data Display
CAB ALT
P
CAB RATE
LDG ELEV
Displayed in feet.
Displayed in psi.
Displayed in
feet/min.
Displayed in feet.
–
–
–
–
CAB RATE Indicator
Displayed when MAN selected.
OIL QTY (QTS)
ENG
APU
RES
APU
RPM EGT
BRAKE TEMP
12 . 3
1300
90%
0 . 00
500
1000
100 650
04 05 04 04
12.3
7.1
3.2
20
19 20
22 22
20
CABIN (°C) CABIN (°C)
OXYGEN
CKPT (°C) AFT CAB ALT
CAB RATE
LDG ELEV
P
EICAS CONTROL PANEL
GX_13_043
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-42 For Training Purposes Only
Sept 04
OUTFLOW VALVES (OFV)
The two electrical OFVs modulate the discharge airflow to control cabin pressure in
both AUTO modes and in the Manual mode.
In both AUTO modes the OFV provides its position to the CPC. In Manual mode it
provides its position to the STATUS page.
The two outflow valves operate in a ‘slave and master’ mode. During normal
operations OFV 2 is master on day 1 and 2 in a four day cycle and OFV 1 is master on
day 3 and 4 in the same four day cycle.
GX_13_044
Outflow Valve
No. 1
Cabin Pressure
Controllers
Outflow
Valve No. 2
Safety
Valves
OIL QTY (QTS)
ENG
APU
RES
APU
RPM EGT
BRAKE TEMP
12 . 3
1300
90%
0 . 00
500
1000
100 650
04 05 04 04
12.3
7.1
3.2
20
19 20
22 22
20
CABIN (°C) CABIN (°C)
OXYGEN
CKPT (°C) AFT CAB ALT
CAB RATE
LDG ELEV
P
CONTROL
PANEL
OUTFLOW
VALVE
NO. 1
OUTFLOW
VALVE
NO. 2
LIM
AUTO 1
MAN
AUTO 2
LIM
AUTO 1
MAN
AUTO 2
CABIN PRESSURE
CONTROLLER
NO. 1
CABIN PRESSURE
CONTROLLER
NO. 2
MANUAL
MANUAL
GX_13_045
For Training Purposes Only
Sept 04
13-43
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
MODES OF OPERATION
The Pressurization system has two independent automatic modes and one manual
mode.
AUTOMATIC MODE
Two identical and independent AUTO control channels (one in each CPC) are
　
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