S 167-007

 (3)  
Remove all the solvent from the valve surfaces with a sponge that is moist with clean water.

 S 167-008

 (4)  
Dry all the valve surfaces with a clean dry cloth.

 F. Put the airplane back to its usual condition
 S 417-010
 (1)  
Install the safety screen. Make sure the actuator arm is free of the safety screen.

 S 417-011

 (2)  
Install the access panel on the aft bulkhead of the bulk cargo compartment.

 S 867-012

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Main Power Distribution Panel
 1) 6J28 CABIN PRESS AUTO A
 2) 6J29 CABIN PRESS AUTO B
 3) 6J30 CABIN PRESS CONT L ICU
 4) 6J31 CABIN PRESS CONT R ICU

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747-400
MAINTENANCE MANUAL

 5) 6L6 CABIN PRESS MAN L 6) 6L7 CABIN PRESS MAN R
 (b)  
P414 Main Power Distribution Panel 1) 414M8 CABIN PRESS ICU LEFT 2) 414B8 CABIN PRESS ICU RIGHT

 (c)  
P83 in the aft equipment center 1) OUTFLOW VALVE-R 2) OUTFLOW VALVE-L

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747-400 MAINTENANCE MANUAL
 CABIN PRESSURE CONTROLLER - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of a cabin pressure controller. The procedure has these parts:
 (1)  
An optional check to make a record of the shop faults

 (2)  
The removal of power to the controller

 (3)  
The removal of the controller from the main equipment rack

 (4)  
The installation of the controller

 (5)  
A CMC ground test of the cabin pressure control system

 B.  There are two equivalent cabin pressure controllers installed on the main equipment rack. Controller A is on the E1-3 electronics shelf. Controller B is on the E2-3 electronics shelf.
 TASK 21-31-02-004-001
 2.  Cabin Pressure Controller Removal (Fig. 401)_________________________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 45-10-00/201, Central Maintenance Computer System

 (4)  
AIPC 21-31-02, Fig. 10

 (5)  
WDM 21-31-11, WDM 21-31-12

 (6)  
SSM 21-31-01, SSM 21-31-03

 B.  Access
 (1)  Location Zone
 117 Electrical/Electronics Compartment, LH
 118 Electrical/Electronics Compartment, RH

 C.  Procedure to Make a Record of Shop Faults (Optional)
 S 864-012
 (1)  
Apply electrical power (AMM 24-22-00/201).

 S 974-014

 (2)  
Make a record of the shop faults for the left or the right cabin pressure controller (AMM 45-10-00/201):

 (a)  Select <OTHER FUNCTIONS from the CMC menu.
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747-400
MAINTENANCE MANUAL

E2
RACK
CABIN PRESSURE CONTROLLER B
SEE A
E1
RACK  CABIN PRESSURE CONTROLLER A
SEE A
SENSE PORT PRESSURE  CABIN PRESSURE CONTROLLER
　
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