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Manual Mode
In manual mode, pressurization is controlled by manually varying the amount of vacuum sent to the secondary outflow valve. The primary valve is slaved to the secondary outflow valve.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.12
Oct 05/06
Cabin Pressurization Schematic
Figure 02.10.5
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.13
Oct 05/06
Differential Pressure Schedule
The outflow valves operate to maintain a differential pressure from 0 to 8.8 psid, according to a predetermined schedule. Should a differential pressure of 9.1 ±0.1 psid be sensed, the outflow valves will automatically open to relieve excess pressure. Whenever the cabin differential pressure exceeds 9.0 psid, the DIFF PRESS warning EICAS message will be displayed.
Should pressure of the fuselage reduce to –0.5 psid, the outflow valves will automatically open to equalize the pressure.
Cabin Pressurization Schedule Figure 02.10.6
Emergency Depressurization
Selecting EMER DEPRESS overrides both automatic and manual control of the outflow valves. Electric signals from the EMER DEPRESS switch command both outflow valves to open, in order to rapidly depressurize the aircraft.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.14
Oct 05/06
Cabin Altitude Limiter
Each outflow valve includes an altitude limiter to prevent the cabin altitude from exceeding a preset limit.
If cabin altitude reaches approximately 14,500 ±500 feet, the altitude limiter closes the outflow valves to maintain the cabin altitude at 14,500 ±500 feet, provided sufficient air is entering the cabin to maintain this level.
Pressure Differential Diaphragms
Pressure differential diaphragms are incorporated into the cabin floor structure, to prevent floor buckling in the event of rapid decompression or emergency depressurization. The diaphragms open to equalize floor pressure when the difference in pressure between the overfloor and underfloor areas exceeds 3 psid.
Cabin Pressurization Panel
The automatic and manual pressurization controls are located on the overhead CABIN PRESSURIZATION panel. Pilot input to the cabin pressure controller for automatic mode operation is made through the cabin pressure selector, which includes:
.
Landing field elevation (A knob);
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Landing field barometric pressure (B knob); and
.
Cabin altitude rate-of-change (R knob).
A yellow FAULT light illuminates to indicate automatic pressurization system failure.
The PRESS CONT switch/light allows selection of manual or automatic control of the pressurization system. Cabin pressurization in manual mode is accomplished by the MAN ALT and MAN RATE controls.
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