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 1.  General
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 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of the lower forward cargo overboard back-up valve.
 B.  The lower forward cargo overboard back-up valve is installed in the overboard exhaust stack in the floor area of the forward cargo compartment.
 TASK 21-26-18-004-001
 2.  Valve Removal (Fig. 401)
_____________
 A.  References
 (1)  
IPC 21-58-51 Fig. 10

 (2)  
WDM 21-23-22

 (3)  
SSM 21-23-02

 B.  Access
 (1)  Location Zone
 124 Forward Cargo Compartment Aft Half, RH

 C.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT CLOSE tags:
 (a)  
P6 Main Power Distribution Panel
 1) 6E34 CARGO AIR COND PCA

 (b)  
P180 DC Power Distribution Panel 1) 180E28 FWD CARGO VLV PWR EXH BACK UP

 S 034-003
 (2)  Remove the electrical connector DV531 from the valve.
 NOTE: The valve is in the floor area of the forward cargo
____
 compartment at station 770.

 S 034-004
 (3)  
Remove the bonding jumper from the valve.

 S 034-005

 (4)  
Loosen the clamp on the inboard end of the valve and remove the inlet assembly.

 S 024-006

 (5)  
Loosen the clamp on the outboard end of the valve and remove the valve.

 S 034-007

 (6)  
Install a cover on the duct opening to prevent entry of unwanted objects.

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 21-26-18
 ALL  ú ú 03 Page 401 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A
STA 770
LOWER FORWARD
LOWER FORWARD CARGO
CARGO OVERBOARD
OVERBOARD VALVE
BACKUP VALVE
(REF) INLET SCREEN
CLAMP (2 LOCATIONS)
LOWER FORWARD CARGO OVERBOARD
EXHAUST STACK

A

Lower Forward Cargo Overboard Backup Valve - Installation Figure 401
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 21-26-18
 ALL  ú ú 03 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 21-26-18-404-008
 3. Valve Installation
__________________
 A. References
 (1)  
AMM 21-26-00/501, Ventilation System

 (2)  
24-22-00/201, Manual Control

 (3)  
IPC 21-58-51 Fig. 10

 (4)  
WDM 21-23-22

 (5)  
SSM 21-23-02

 B. Access
 (1)  Location Zone
 124 Forward Cargo Compartment Aft Half, RH

 C. Procedure
 S 434-009
 (1)  
Remove the cover from the duct opening.

 S 214-010

 (2)
Make sure the mating surfaces of the valve and duct are clean.

 S 424-011

 (3)  
Install the valve with the flow arrow pointed to the overboard valve and install the clamp on the inboard end of the valve.

 S 434-012

 (4)  
Put the inlet assembly on the outboard end of the fan and install the clamp.

 S 214-013

 (5)  
Examine the valve installation to make sure the clamps are tight and the valve aligns correctly with the duct.

 S 434-014

 (6)  
Install the bonding jumper on the valve.

 S 434-015

 (7)  
Install the electrical connector DV531 on the valve.

 S 864-016

 (8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel
 1) 6E34 CARGO AIR COND PCA

 (b)  
P180 DC Power Distribution Panel 1) 180E28 FWD CARGO VLV PWR EXH BACK UP

 

　
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