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HIGH . Provides a variable rate limit, up to 800 ft/min, depending on airplane vertical speed.
The system includes safety devices, which override AUTO and MANUAL mode for OFV travel limitation, cabin limitation and differential pressure limits.
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
In both AUTO and MANUAL modes, the CPCS provides indication of cabin pressure parameters on the STATUS page and any failures are displayed on EICAS.
The CPCS provides means to 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.
MAN ALT Toggle switch LDG ELEV Toggle switch
Used to control cabin altitude in manual mode. Used to select the mode of operation for landing
UP . Commands cabin to climb. elevation.
DN . Commands cabin to descend.
MAN . Manual selection of the landing field
Mid . Spring.loaded to mid position keeps elevation.
outflow valve to last commanded position.
FMS . FMS selects landing field elevation.
operation.
selected.
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.
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 700.1A11.21.004.
FGF0210_015a
. Indicates valve is
closed.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
AIR CONDITIONING AND PRESSURIZATION
To view pressurization data, select STAT on EICAS Control Panel, located on the pedestal.
EICAS Control Panel
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.
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.
LDG ELEV . Not displayed.
CAB RATE Indicator
Displayed when MAN selected.
FGF0210_016
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
There are two modes of operation while the CPCS is controlled in AUTO, the PRIMARY and the SECONDARY mode.
Pressurization operating modes are as follows:
Automatic Mode
Two identical and independent “AUTO” control channels (one in each CPC), are available from two CPCs.
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