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the aircraft speed received from the ADC. A typical cabin descent rate is approximately 300 sea level fpm.
For example, if the aircraft’s descent rate is 2000 fpm the cabin will descend at approximately 300 sea level fpm. If the
aircraft is descending at greater than 5000 fpm the cabin will descend at 750 sea level pm.
Cabin altitude will descend on schedule until the cabin altitude is approximately 300 feet below the selected landing destination
elevation.
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.
AIR CONDITIONING/PRESSURIZATION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 02-04-03
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 !P, 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 comfortable
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.
AIR CONDITIONING/PRESSURIZATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
02-04-04 CSP 100-6 REV 1
PRESSURIZATION (Cont)
PRESSURIZATION SCHEDULE — DESCENT AND HOLD (<25 000 FT)
Note: For holding above 25 000 ft following descent, the pressurization schedule for Climb and Cruise applies.
PRESSURIZATION SCHEDULE — CLIMB AND CRUISE
Aircraft
Altitude
(ft)
Cabin
Altitude
(ft)
Cabin
Delta P
(PSID)
Aircraft
Altitude
(ft)
Cabin
Altitude
(ft)
Cabin
Delta P
(PSID)
Aircraft
Altitude
(ft)
Cabin
Altitude
(ft)
Cabin
Delta P
(PSID)
-1500 -1786 0.1 15 000 1379 5.8 33 000 4955 8.3
-1000 -1273 0.1 16 000 1504 6.0 34 000 5272 8.3
0 -245 0.1 17 000 1637 6.3 35 000 5612 8.3
1000 -135 0.6 18 000 1778 6.5 36 000 5877 8.3
1500 -81 0.8 19 000 1926 6.8 37 000 6076 8.4
2000 -26 1.0 20 000 2091 7.0 38 000 6331 8.5
3000 81 1.4 21 000 2258 7.2 39 000 6586 8.5
4000 187 1.9 22 000 2429 7.4 40 000 6827 8.5
5000 294 2.3 23 000 2608 7.6 41 000 7056 8.5
6000 399 2.7 24 000 2795 7.7 42 000 7272 8.5
7000 504 3.0 25 000 2984 7.7 43 000 7476 8.6
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