(10)
 Make sure that the clamp (8) is in the correct position.

 (11)
 TORQUE the clamp (8) to between 0.28 and 0.38 m.daN (24.77 and 33.62 lbf.in).

 (12)
 Remove the blanking caps from the disconnected electrical connectors.

 (13)
 Make sure that the electrical connectors are clean and in the correct condition.

 (14)
 Connect the electrical connector (5).

 (15)
 Make sure that the work area is clean and clear of tool(s) and other items.

 Subtask 21-28-54-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 30HN, 31HN.
 Subtask 21-28-54-720-050
 C. Do the functional test of the AFT cargo-compartment ventilation system (Ref. TASK 21-28-00-720-004).
 1EFF : ALL 1 21-28-54Page 408 1 1 Aug 01/05R 1 1 1CES 1

 5. Close-up
________ Subtask 21-28-54-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 162DW (Ref. TASK 25-55-12-400-001).

 (3)
 Remove the access platform(s).

 (4)
 Close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).

 Subtask 21-28-54-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 PRESSURIZATION CONTROL - DESCRIPTION AND OPERATION__________________________________________________
 1. General_______
 2. System Description__________________ 
R 
R  A. Automatic Operation 
R  The system has two identical, independent, automatic systems. Each system 
R  has a Cabin Pressure Controller (CPC) which controls the pressure through 
R  a flap-type outflow valve. 
R  In the automatic operation the CPCs use the data from the Flight 
R  Management and Guidance System (FMGS) and the Air Data/Inertial Reference 
R  System (ADIRS). The active CPC controls with the auto-motor the outflow 
R  valve to the demanded position. It also supplies data for indication on 
R  the Electronic Instrumentation System (EIS). 
R  Only one CPC operates the system at the time, with the other system on 
R  hot standby. The change of control from one CPC to the other is fully 
R  automatic after each flight, on landing. The CPCs will also change in 
R  flight if there is a failure or part failure of one of the control 
R  systems. 
R  B. Semi-Automatic Operation 
R  If the data from the FMGS is not available, the landing field elevation 
R  can be manually adjusted with the LDG ELEV selector on the CABIN PRESS 
R  overhead panel 25VU. Then the CPCs controls the outflow valve with data 
R  from the ADIRS and the LDG ELEV selector. 
R  C. Manual Operation 
R  The MAN V/S toggle-switch controls the manual motor of the outflow valve 
R  when the MAN SEL switch is selected to MAN. These controls are installed 
R  in the cockpit, on the CABIN PRESS overhead panel 25VU. 
R  In manual mode, the backup channel of the CPC in position No. 1 is used. 
R  It has a pressure sensor to generate the excess cabin altitude warning 
R  and pressure outputs for the indication on the EIS.

 PRESSURE CONTROL AND MONITORING - DESCRIPTION AND OPERATION
___________________________________________________________
 1.
 General

_______ The (Cabin) Pressure Control and monitoring System (CPCS) makes sure that the pressure in the pressurized fuselage is safe and comfortable for the passengers and crew. The Cabin Pressure Controllers (CPC) control fully automatically the quantity of air that flows out of the fuselage through an outflow valve. A manual system controls the CPCS if the automatic system is not active. Two safety valves are installed in the aft pressure bulkhead which prevent that the pressure in the fuselage gets too high or too low.

 2.
 Component Location

__________________

R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 001)

R **ON A/C 106-149, 303-399, 401-499,
R (Ref. Fig. 001A)

R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
　
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