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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