21-58-05
 ALL  ú ú 03 Page 403 ú Feb 10/94
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A
747-400 MAINTENANCE MANUAL
 SMOKE/OVERRIDE VALVE - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the smoke/override valve for the equipment cooling system. The valve is installed in the left sidewall lining of the forward cargo compartment at station 540.
 TASK 21-58-06-004-001
 2.  Smoke/Override Valve Removal (Fig. 401)____________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (3)  
IPC 21-58-06 Fig. 1

 (4)  
WDM 21-58-25

 (5)  
SSM 21-58-06

 B.  Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 C.  Prepare for the Removal
 S 864-002
 CAUTION: DO NOT OPERATE THE ELECTRICAL/ELECTRONIC EQUIPMENT WHEN YOU DO
_______ THIS PROCEDURE. IF YOU OPERATE THE ELECTRICAL EQUIPMENT WHEN THE EQUIPMENT COOLING SYSTEM IS NOT ON, YOU COULD CAUSE THE ELECTRICAL EQUIPMENT TO BECOME TOO HOT.
 (1)  
Remove the electrical power (Ref 24-22-00/201).

 S 014-003

 (2)  
Remove the left sidewall lining at station 540 of the forward cargo compartment (Ref 25-52-01/401).

 D.  Remove the Valve
 S 034-004
 (1) Disconnect the electrical connector DV448 from the valve.
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 21-58-06
 ALL  ú ú 01A Page 401 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SMOKE/OVERRIDE VALVE
SEE A FWD
FORWARD CARGO COMPARTMENT LEFT SIDEWALL
ELECTRICAL MANUAL OVERRIDE HANDLECONNECTOR (POSITION INDICATOR)
CLAMP
(TYPICAL)

A

Equipment Cooling Smoke/Override Valve Installation
Figure 401

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 21-58-06
 ALL  ú ú 01A Page 402 ú Feb 18/02
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747-400 MAINTENANCE MANUAL
 S 034-006
 (2)  
Remove the clamp at each end of the valve.

 S 024-021

 (3)  
Remove the valve.

 S 434-007

 (4)  
Put a cover on the duct openings.

 TASK 21-58-06-404-008
 3.  Smoke/Override Valve Installation (Fig. 401)_________________________________
 A. References
 (1)  
21-58-00/501, Equipment Cooling System

 (2)  
25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (3)  
IPC 21-58-06 Fig. 1

 (4)  
WDM 21-58-25

 (5)  
SSM 21-58-06

 B. Access
 (1)  Location Zone 121 Forward Cargo Compartment Forward Half, LH
 C. Install the Valve
 S 034-009
 (1)  
Remove the cover from the duct openings.

 (a)  Make sure there is no unwanted material in the duct.

 (2)  
Put the valve in its position with the flow arrow pointed outboard.

 (3)  
Install a clamp on each end of the valve.

 (4)  
Connect the electrical connector DV448 to the valve.

 S 424-010
 S 434-011
 S 434-013
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-06
 ALL  ú ú 01A Page 403 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
　
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