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A
747-400 MAINTENANCE MANUAL
 B. Parts
 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 |Pressurization Outflow Valve | 21-31-01| 02 | 65 | | | 7 |Screw | | | 5 | | | 8 |Washer | | | 10 | | | 9 |Nut | | | 15 | | | 10 |Bolt | | | 20 | | | 11 |Washer | | | 25 | | | 12 |Bolt | | | 40 | | | 13 |Washer | | | 50 | | | 14 |Nut | | | 60 | | | 15 |Bolt | | | 35 | | | 16 |Washer | | | 45 | | | 17 |Nut | | | 55 | 2......…........…...................................…..........….....….........1
 C. References
 (1)  
AMM 21-31-00/501, Cabin Pressure Control System

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

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

 (4)  
SSM 21-31-02, SSM 21-31-04

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

 E. Procedure
 S 824-014
 (1)  Put the outflow valve assembly (1) in its position on the skin opening.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 434-035
 (2)  Install the washers (11) and bolts (10). Tighten the bolts by hand.
 S 824-015
 (3)  From outside of the airplane, make a mark on the outflow valve frame at each bolt hole location. Make a mark on the outflow valve frame in 24 locations for the 1/4-inch holes and in 8 locations for the 5/16-inch holes.
 S 324-016
 (4)  Remove the outflow valve assembly (1) from the airplane and drill the holes for the 1/4-inch (6.4 mm) and the 5/16-inch (8 mm) bolts.
 S 394-017
 (5)  Apply the sealant to the outflow valve frame and the skin mating surfaces.
 S 424-018
 (6)  Put the outflow valve assembly in its position on the skin opening.
 S 434-019
 (7)  Install the 24 bolts (15), washers (16), and nuts (17).
 S 434-020
 (8)  Install the 8 bolts (12), washers (13), and nuts (14).
 S 434-021
 (9)  Attach the gearcase to the bracket with the bolts (10) and washers (11).
 S 434-022
 (10) Attach the bonding jumper (6) to the structure with the screw (7), washer (8) and nut (9).
 S 434-023
 (11) Install the electrical connectors (3, 4, and 5) on the valve (1).
 (a)  The DC motor electrical connector (3),
 DV90C-right or DV91C-left

 (b)  The AC motor electrical connector (4),
 DV90A-right or DV91A-left

 (c)  The position potentiometer electrical connector (5),
 DV90B-right or DV91B-left.

 S 414-025
 (12) Install the safety screen (2).  Make sure the actuator arm is free of the safety screen.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 864-026
 (13) 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 LEFT
 2) 414B8 CABIN PRESS ICU RIGHT

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

 

 S 864-027
 (14)
 Apply electrical power (AMM 24-22-00/201).

 S 864-033

 (15)
　
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