S 434-015

 (5)  
Install the electrical connectors on the valve:

 (a)  
The DC motor electrical connectors, DV90C-right or DV91-left

 (b)  
The AC motor electrical connector, DV90A-right or DV91A-left

 (c)  
The position potentiometer electrical connector, DV90B - right or DV91B- left.

 S 414-025
 (6)  
Install the safety screen.

 S 864-018

 (7)
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
 5) 6L6 CABIN PRESS MAN L
 6) 6L7 CABIN PRESS MAN R

 (b)  
P414 Main Power Distribution Panel
 1) 414M8 CABIN PRESS ICU L
 2) 414B8 CABIN PRESS ICU R

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

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747-400 MAINTENANCE MANUAL
 S 864-026
 (8)  
Apply electrical power (Ref 24-22-00/201). S 744-027

 MOVE.

 (9)  
Do a ground test of the cabin pressure control system (CPCS) on the CMC CDU (AMM 21-31-00/501):

 CAUTION:_______ MAKE SURE THERE IS NO BLOCKAGE IN THE VALVE FLAPPER DOORS.
 THE AUTOMATIC MOVEMENT OF THE VALVES DURING THE GROUND TEST
 CAN CAUSE DAMAGE IF THE VALVE FLAPPER DOORS ARE NOT FREE TO

 (a)  Make sure the AUTO SELECT switch is set to the NORM position.
 NOTE: The AUTO SELECT switch is on the P5 overhead panel.
____
 (b)  Make sure the MAN L and MAN R switches are set to off.
 NOTE: The MAN L and MAN R switches are on the P5 overhead
____ panel.
 (c)  
Select <GROUND TESTS from the CMC main menu.

 (d)  
Select <21 CABIN PRESSURE from the ground tests menu.

 (e)  
Select <CPCS-A or <CPCS-B from the cabin pressure menu.

 (f)  
Make sure that IN PROGRESS shows on the CMC CDU.

 (g)  
Make sure that PASS shows on the CMC CDU.

 S 714-028
 (10) Do a manual operation test:
 (a)  
Push the applicable (MAN L or MAN R) switch-light, on the P5 panel, to the ON position.

 (b)  
Move the OPEN/CLOSE switch, on the P5 panel, to the CLOSE position.

 (c)  
Make sure the outflow valve position indicator moves to the closed position.

 (d)  
Move the OPEN/CLOSE switch, on the P5 panel, to the OPEN position.

 (e)  
Make sure the outflow valve position indicator moves to the fully open position.

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747-400 MAINTENANCE MANUAL
 (f)  Push the applicable (MAN L or MAN R) switch-light, on the P5 panel, to the off position.
 S 864-023
 (11) Remove electrical power (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 OUTFLOW VALVE DC MOTOR - 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 the outflow valve manual (DC) motor. The procedure has these parts:
　
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