Pressurization Outflow Valve Installation
Figure 401 (Sheet 2)

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A
747-400
MAINTENANCE MANUAL

 (2)  
WDM 21-31-13, WDM 21-31-21, WDM 21-31-22

 (3)  
SSM 21-31-02, SSM 21-31-04

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

 D. Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (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 the aft equipment center
 1) OUTFLOW VALVE-R
 2) OUTFLOW VALVE-L

 S 014-003
 (2)  
Remove the access panel on the aft bulkhead of the bulk cargo compartment to get access to the outflow valves (1).

 S 014-004

 (3)  
Remove the safety screen (2).

 S 034-005

 (4)  
Remove the electrical connectors (3, 4, and 5) from the valve (1):

 (a)  The DC motor electrical connector (3),
 DV90C-right or DV91C-left

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 (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 034-007
 (5)  
Remove the screw (7), washer (8) and nut (9) to disconnect the bonding jumper (6) from the structure.

 S 034-008

 (6)  
Remove the bolts (10) and washers (11) that hold the gearcase housing to the bracket (2 locations).

 S 034-009

 (7)  
Remove the bolts (12), washers (13) and nuts (14) from the retainer (8 locations).

 S 034-010

 (8)  
Remove the bolts (15), washers (16) and nuts (17) from around the outflow valve frame (24 locations).

 S 024-011

 (9)  
Remove the outflow valve assembly (1).

 NOTE: Prior to the installation of the fasteners common to
____ the skin and valve assembly, if the gap between the skin and the valve assembly is:
 -Less than 0.018 inches, do not install the 65B40019-3 shim assembly.
 -Between 0.019 and 0.038 inches, install the 69B41134-2 or -3 shim assembly, as required.
 -Exceeds 0.039 inches, install the 65B40019-3 shim assembly.
 S 144-012
 (10) Use a plastic (nonmetallic) knife to remove the remaining sealant from the airplane surfaces.
 TASK 21-31-01-404-013
 3. Pressurization Outflow Valve Installation (Fig. 401)
_________________________________________
 A. Consumable Materials
 (1)  A00247, Sealant - Chromate, BMS 5-95 Class B (preferred) A00310, Sealant, BMS 5-79 (optional) A00142, Compound - Sealing, BMS 5-44 (optional) A00254, Compound - Sealing, BMS 5-26, PRO SEAL 890 only (optional)
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