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pressure controller.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−10
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Cabin Pressure Controller (CPC)
The cabin pressure controller (CPC) uses a preprogrammed schedule to automatically regulate
cabin pressure. The CPC receives and processes inputs from the S3 static port (ambient
pressure), cabin pressure acquisition module (CPAM), cabin pressurization selector, thrust
levers, and weight-on-wheels relays to control pressurization by electrically controlling outflow
valves.
During automatic mode operation, the flight crew tasks are normally limited to selection of a
landing field elevation prior to takeoff, and ensuring that the proper barometric correction is
made before landing.
If the CPC fails, both outflow valves will go to an isobaric hold mode to maintain the existing
cabin altitude. When a CPC failure occurs, the AUTO PRESS caution EICAS message appears,
the amber FAULT light located on the cabin pressure selector and the FAIL annunciator on the
PRESS CONT switch/light illuminate.
Outflow Valves
Dual, redundant, electropneumatic, poppet-type outflow valves, identified as primary and
secondary, are installed on the aft pressure bulkhead to regulate the overboard discharge of
cabin and cockpit air. The outflow valves are spring-loaded closed and modulate open when
vacuum pressure is applied to an internal diaphragm. A jet pump fed by 10th-stage bleed air
uses venturi action to provide a source of vacuum to operate the primary and secondary outflow
valves for both automatic (electropneumatic) and manual (pneumatic) operation.
Both primary and secondary outflow valves are slaved through a pneumatic line. The outflow
valves respond to electrical control signals in the automatic mode, or pneumatic inputs via the
manual regulators on the CABIN PRESSURIZATION panel in manual mode.
Automatic Mode
In automatic mode, the outflow valves are electropneumatically controlled and operated to set
and maintain the aircraft pressurization schedule. The CPC provides electrical commands
which regulate the amount of vacuum applied in order to modulate the opening of the primary
outflow valve. The secondary valve is slaved to the primary outflow valve.
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 02−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
Cabin Pressurization Schematic
Figure 02−10−5
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 and the
“CABIN PRESSURE” aural warning will sound.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−12
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
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
Electrical signals from the EMER DEPRESS switch command both outflow valves to open in
order to rapidly depressurize the aircraft.
On airplanes 5301 to 5366 and airplanes not incorporating SB 604–21–004:
If the airplane is above 13,000 feet, the altitude limiters operate to prevent cabin altitude from
exceeding 13,000 ±500 feet (if conditioned air is still available).
If the airplane altitude is below 13,000 feet, the airplane will depressurize.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−13
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
PRESSURIZATION SYSTEM (CONT'D)
On airplanes 5367 and subsequent and airplanes incorporating SB 604–21–004:
The altitude limiters operate to prevent cabin altitude from exceeding 14,500 ±500 feet (if
conditioned air is stll available).
Cabin Altitude Limiter
Each outflow valve includes an altitude limiter to prevent the cabin altitude from exceeding a
　
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