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DEPRESSURIZATION SEQUENCE ON GROUND
After landing or after an aborted takeoff, the cabin will depressurize at a rate of 500 sea level feet to equalize cabin, then OFV will go to full open and remain in that configuration while on ground.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
02-04-02
PRESSURIZATION (Cont) MANUAL PRESSURIZATION MODE
When MANUAL is selected on the PRESSURIZATION control panel the outflow valve is manually controlled. The MAN RATE knob is used to select the desired cabin pressure altitude rate of change. An UP selection on the MAN RATE knob will cause an increase in cabin altitude. A DN selection of the MAN RATE knob will cause a decrease in cabin altitude. When the MAN RATE knob is set directly between UP and DN, cabin altitude will be maintained regardless of changes to aircraft altitude. The maximum rate of change in the MANUAL mode is 2500 fpm.
BEFORE TAKEOFF
Before takeoff, note cabin altitude and start to pre-pressurize the aircraft by adjusting the MAN RATE switch toward the DN position (it is recommended to select approximately -300 fpm, although any rate may be selected). Cabin pressure will slowly start to increase (cabin altitude will go down), due to the lack of initial delta P.
If enough time is allowed before the actual takeoff run, upon reaching 300 ft below noted cabin altitude, select cabin rate of climb to zero, and allow cabin to stabilize (CAB RATE shows as 0 FPM on the EICAS ECS synoptic page). If actual takeoff is performed prior to cabin pre-pressurization, pressure bumps may occur.
TAKEOFF AND CLIMB
Before takeoff, cabin altitude may be selected as desired. Selected altitude is displayed on the ECS synoptic summary page.
Monitor CAB ALT and CAB rP, and make the necessary adjustments to keep the delta P within limits. Adjustments may be performed through the MAN RATE switch (+ 500 fpm to raise cabin altitude, and -300 fpm to descend cabin altitude, although any rate may be selected).
CRUISE
During cruise, cabin altitude can be selected as desired, provided applicable limits for cabin altitude and delta P are observed.
DESCENT AND LANDING
The desired cabin altitude for landing should be set to 300 ft below the field elevation. For initial descent steps, any com-fortable cabin rate may be selected.
For final descent and landing, or if an unrestricted descent is intended, the cabin rate should be proportional to the aircraft descent time. For example, if the aircraft is at 27 000 ft and a 3000 fpm descent is desired, it will take approximately 9 minutes to land. To determine the rate of descent, divide the difference between the current cabin altitude and the landing altitude.
NOTE: Monitor cabin delta P during descent and approach to make the necessary adjustments to keep delta P less than 1 psid (maximum allowed for landing).
AFTER LANDING
After landing, depressurize the aircraft by adjusting the MAN RATE switch toward the UP position until field elevation is attained.
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