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EMER DEPRESS SWITCH
The EMER DEPRESS switch is an alternate-action switch located on the PRESSURIZATION panel. A guard is installed over the switch to prevent inadvertent actuation. The switch is used to depressurize the cabin for smoke and fume evacua-tion. The EMER DEPRESS function is available in both automatic and manual modes. In AUTO mode, when EMER DE-PRESS is selected ON, the cabin will depressurize at 2500 SLFPM up to 14 000 ft ± 100 ft or the aircraft altitude, whichever is lower. In MANUAL mode, when EMER DEPRESS is selected ON, the cabin will depressurize at 3000 SLFPM up to 14 500 ft ± 500 ft or the aircraft altitude, whichever is lower.
NOTE: In manual mode, the cabin may also be depressurized by selecting MAN RATE to max UP from the control panel.
DITCHING SWITCH
The DITCHING switch is used to depressurize the cabin, shut off the air conditioning, and then keep the OFV closed in the event of a water landing. The sequence activates automatically, and is inhibited above 15 000 ft.
NOTE: The ditching function is not available in manual mode. To close the outflow valve, turn the MAN RATE knob to max down.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
02-04-05 CONTROLS AND INDICATIONS (Cont)
LANDING SEQUENCES AT FIELD ELEVATION GREATER THAN 7850 FT
This sequence does not require additional crew action, if the actual landing field elevation was selected prior to takeoff. The scheduled cabin pressure altitude is normally limited to 7850 ft during flight and then automatically reset to the landing field pressure altitude.
The CABIN ALTITUDE (C) CAS message is normally set for 8500 ft and the CABIN ALTITUDE (W) CAS message and aural “CABIN ALTITUDE” voice warning is set for 9400 ft. When the aircraft descends below 41 000 ft, the caution and warning thresholds start to increase as a function of the aircraft altitude and aircraft rate of descent.
The CABIN ALT WARN HIGH (A) CAS message is displayed, informing the crew that the warning and caution limits have been reset to higher than normal values.
The CABIN ALTITUDE (C) message increases up to 650 ft above landing field pressure altitude and the CABIN ALTITUDE (W) message increases up to 1550 ft above the landing field pressure altitude. Both thresholds are lim-ited to 14 300 ft pressure altitude.
LEVELING OFF DURING DESCENT
If a leveling off occurs above 41 000 ft during descent:
-The cabin altitude remains at 7850 ft
-The CABIN ALTITUDE caution and warning remain at 8500 ft and 9400 ft respectively
If leveling off between 41 000 and 25 000:
-The cabin altitude as well as caution and warning thresholds will level also as a function of aircraft altitude
-If the leveling off lasts for more than 3 minutes, the cabin altitude will descend at a rate of -300 sea level fpm back-
wards towards 7850 ft. The caution and warning thresholds will also descend at a rate of -300 fpm until aircraft
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