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DIFF PRESS warning message when cabin pressure differential exceeds 9.0 psid.
If PASS SIGNS switches are selected to AUTO, the CPAM will cause the NO SMKG and SEAT 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 02.10.11
Oct 05/06
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.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-AIR_CONDITIONING_and_PRESS(7)
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