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Mid − Spring−loaded to mid position keeps
LDG ELEV Toggle switch
Used to select the mode of operation for landing
elevation.
MAN − Manual selection of the landing field
elevation.
FMS − FMS selects landing field elevation.
UP/DN Toggle switch
Used to manually set landing field
altitude, up or down (feet).
RATE switch
Used to select cabin climb
rate of change.
HIGH − Up to 800 ft/min
climb and up to 800 ft/min
descent.
NORM − 500 ft/min climb
and 300 ft/min descent.
outflow valve to last commanded position.
MAN
ON
ON
CLOSED
MAN PRESSURIZATION AUTO
AUTO/
MAN
MAN
MAN ALT
UP
DN
OUTFLOW VALVE
CLOSED
1
CLOSED
2
DITCHING
ON
MAN
FMS
UP
DN
HIGH
NORM
LDG ELEV RATE
DEPRESS
ON
EMER
NOTE
During high elevation airfield
operation the cabin rate is
controlled independent of
switch position. See Rate
Limit Selection for detail rate,
pre and post SB 700−21−034.
AIR CONDITIONING AND PRESSURIZATION
Flight Crew Operating Manual REV 51, Aug 14, 2006
CSP 700−6
Volume 2
02−10−38
PRESSURIZATION (CONT'D)
To view pressurization data, select STAT on EICAS Control Panel, located on the pedestal.
FGF0210_016 EICAS Control Panel
CKPT (°C) FWD
CABIN (°C)
AFT
CABIN (°C)
20
90
22
20
22
20
1300
0.00
500
OXYGEN 1000
CAB ALT
P
CAB RATE
LDG ELEV
19
%
OIL QTY (QTS)
ENG
APU
RES
10.4
4.5
5.0
10.4
APU
RPM 100 EGT 650
BRAKE TEMP
03 03 03 03
20
1300
90
13% 13%
22 0.00
CKPT (°C)
OXYGEN
OPEN OPEN
OUTFLOW VALVES
CAB ALT
CAB RATE
P
0 0
1 2
1 2
1 2
AFT
CABIN (°C)
%
CABIN (°C)
22
19 20 20
FWD
LDG ELEV − Not displayed.
AUTO Mode Data Display
CAB ALT − Displayed in feet (pressure altitude).
P − Displayed in psid.
CAB RATE − Displayed in feet/min.
LDG ELEV − Displayed in feet (MSL).
MAN Mode Data Display
CAB ALT − Displayed in feet.
P − Displayed in psid.
CAB RATE − Sweep range
displayed in ft/min.
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.
CAB RATE Indicator
Displayed when MAN selected.
EICAS
SCROLL SYSTEM SELECT
AIR CONDITIONING AND PRESSURIZATION
REV 51, Aug 14, 2006 Flight Crew Operating Manual
CSP 700−6
Volume 2
02−10−39
MODES OF OPERATION
Pressurization operating modes are as follows:
Automatic Mode
Two identical and independent “AUTO” control channels (one in each CPC), are available from
two CPCs.
The automatic controller performs the following functions:
• Automatic control of cabin altitude, rate regulation and rate limitation.
• Ditching sequence.
• Door open protection.
• Generating outputs for EICAS display and messages.
• CAIMS function and interface.
AUTO mode is dependent upon the following information:
• Airplane altitude, vertical speed and barometric correction received from ADCs and DAUs or
scheduled flight information from FMS when available.
• Landing elevation from FMS when available, or directly selected from the switch on the
cabin pressure control panel.
• Rate limit selection from cabin pressure control panel.
• Weight on wheels and door open position from Landing Gear Electronic Control Unit
(LGECU).
• Engine throttle position from Electronic Engine Controllers (EEC).
FGF0210_017
DAU
3
ADC
1
DAU
1
DAU
2
ADC
2
DAU
4
MANUAL
MANUAL
CABIN
PRESSURE
CONTROLLER 1
CABIN
PRESSURE
CONTROLLER 2
FMS
LGECU
EEC
CONTROL
PANEL
OUTFLOW
VALVE 1
OUTFLOW
VALVE 2
SAFETY
VALVE 2
LIM
LIM
AUTO 1
AUTO 1
MAN
MAN
AUTO 2
AUTO 2
SAFETY
VALVE 1
There are two modes of operation while the CPCS is controlled in AUTO, the PRIMARY and the
SECONDARY mode.
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