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The rate of descent is automatically limited to:
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300 fpm if airplane vertical speed is ≤ +1428 fpm.
.
1260 fpm if airplane vertical speed is ≥ +6000 fpm.
.
Between the above values the cabin rate of change is proportional to airplane vertical speed.
LDG ELEV
Digital readout in 10 foot increments.
GF0210_063
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
When the LDG ELEV FMS/MAN selector is set to FMS, the landing destination information has been programmed in the FMS and the flight plan activated, the LDG ELEV is displayed on the STAT page.
GF0210_064
When the LDG ELEV FMS/MAN selector is set to MAN, the LDG ELEV selection is made from the Pressurization Control Panel. The LDG ELEV is defaulted to 0 feet on the ground and 5,670 feet in flight. A message is displayed on EICAS and will remain posted until a selection of UP or DN.
Rev 12, Aug 14, 2006 Flight Crew Operating Manual Volume 2
MODES OF OPERATION (CONT'D) Landing Elevation (Cont’d)
To enter a new LDG ELEV, hold the UP/DN switch until desired field elevation is reached.
GF0210_066
Manual Mode
In the manual mode, cabin pressure is manually controlled by the crew selecting the applicable switches on the Pressurization control panel.
MAN ALT Toggle switch
Used to control cabin altitude in
manual mode.
Spring loaded to mid position.
UP . Commands cabin to climb.
DN . Commands cabin to descend.
GF0210_067
mode is selected. back to AUTO will enable the other CPC.
Selecting MAN will display both outflow valve position indicators, display an analog rate of change gauge and eliminate the LDG ELEV on the status page and display a status message on EICAS.
OUTFLOW VALVES Position Indicators must monitor CAB ALT. Displayed when MAN selected and measured in percent. Also displayed when EMER DEPRESS selected, or OUTFLOW VLV closed, or DITCHING selected.
GF0210_068
When the MAN ALT (spring loaded) toggle switch is selected to UP, both outflow valves open slowly, and the cabin altitude increases proportionally to the outflow change.
GF0210_069
Volume 2 Flight Crew Operating Manual Rev 12, Aug 14, 2006
When the MAN ALT toggle switch is selected to DN, both outflow valves close slowly and the cabin altitude decreases proportionally to the outflow change.
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The desired control (climb, level, descent) is maintained by adjusting, if necessary, the outflow valve positions, according to flow or differential pressure changes.
Manual Mode Operation
Operate pressurization, MAN/ALT toggle switches as required:
.
To increase cabin altitude, select MAN/ALT toggle switch to UP momentarily and monitor climb rate and cabin altitude.
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To decrease cabin altitude, select MAN/ALT toggle switch to DN momentarily and monitor descent rate and cabin altitude.
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