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BLTS signs to illuminate when the airplane’s cabin altitude exceeds 10,000 feet.
The CL−605 has two CPAMs installed (CPAM 1 and CPAM 2). For the following parameters
(cabin altitude, cabin altitude rate of change and cabin differential pressure), the DCU uses the
highest value between CPAM 1 and CPAM 2 for its logic as a source of information.
If either CPAM 1 or CPAM 2 fails, the EICAS CPAM FAULT status message will be displayed.
However, if both CPAM 1 and CPAM 2 fail, the CPAM FAIL caution message is displayed, and
all of the above functions will be lost.
NOTE
Failure of the CPAM does not affect the operation of the cabin
pressure controller.
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.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−10
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
PRESSURIZATION SYSTEM (CONT'D)
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
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
PRESSURIZATION SYSTEM (CONT'D)
Cabin Pressurization Schematic
Figure 02−10−5
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−12
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
PRESSURIZATION SYSTEM (CONT'D)
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 02−10−13
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
PRESSURIZATION SYSTEM (CONT'D)
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