S 744-034
 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 MOVE.
 (16) Do a ground test of the cabin pressure control system (CPCS) on a CMC CDU (AMM 21-31-00/501):
 (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 TEST on 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 is shown on the CMC CDU.

 (g)  
Make sure PASS is shown on the CMC CDU.

 S 714-031
 (17) Do a manual operation test:
 (a)  Push the applicable (MAN L or MAN R) switch-light, on the P5 panel, to the ON position.
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747-400 MAINTENANCE MANUAL
 (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.

 (f)  
Push the applicable (MAN L or MAN R) switch-light, on the P5 panel, to the off position.

 S 864-032
 (18) Remove electrical power (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 PRESSURIZATION OUTFLOW VALVES - INSPECTION/CHECK
________________________________________________
 1.  General_______
 A.  This task gives instructions for a visual inspection of the pressurization outflow valves. The inspection is done with the valves installed on the airplane.
 B.  The pressurization outflow valves must be examined at regular intervals.
 C.  You get access to the outflow valves through an access door on the aft bulkhead of the bulk cargo compartment.
 TASK 21-31-01-206-001
 2.  Pressurization Outflow Valve Inspection_______________________________________
 A.  References
 (1)  
21-31-01/701, Pressurization Outflow Valve

 (2)  
IPC 21-31-01 Fig. 2

 (3)  
WDM 21-31-13, 21-31-21, 21-31-22

 (4)  
SSM 21-31-02, 21-31-04

 B.  Access
 (1)  Location Zone
 151 Area Aft of Bulk Cargo Compartment, LH
 152 Area Aft of Bulk Cargo Compartment, RH

 C.  Procedure
 S 866-002
 (1)  Open the circuit breakers that follow for the left or the right outflow valve:
 (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 LEFT
 2) 414B8 CABIN PRESS ICU RIGHT

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

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