S 214-021

 (5)  
Make sure that the filters are serviceable.

 (a)  
If you find damage or deterioration, then discard the filter.

 (b)  
If air does not flow through the filter freely, then clean the filter again or discard the filter.

 S 424-022
 (6)  Install the filters (AMM 21-51-13/401).
 TASK 21-51-13-404-006
 4.  Flow Control and Shutoff Valve Filter Installation (Fig. 401)__________________________________________________
 A. Consumable Materials
 (1)  
D00242 Dow Corning DC-44A Grease

 (2)  
D00559 MO-LITH No. 2 Thread Lubricant - Antiseize compound

 B. References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
20-11-28/401, Lockwire

 (3)  
IPC 21-51-01 Fig. 1

 C. Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panel
 191N-L Air Conditioning Access Door
 191H-L Air Conditioning Access Door
 192H-R Air Conditioning Access Door

 D. Install the Filters
 S 644-008
 (1)  Apply the grease to the O-ring on the plug.
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747-400 MAINTENANCE MANUAL
 S 644-009
 (2)  
Apply the antiseize compound to the threads on the plug.

 S 424-010

 (3)  
Put the filter, flange end first, in the flow control and shutoff valve.

 S 434-015

 (4)  
Install the spring and the plug in the valve.

 (a)  Tighten the plug to 60 - 70 pound-inches
 (6.78 - 7.90 newton-meters).
 S 434-011
 (5)  Install a lockwire on the plug (Ref 20-11-28/401).
 E. Put the airplane to its usual condition
 S 414-012
 (1)  Close the applicable access door, 191N-L, 191H-L, or 192H-R (Ref 06-09-03/201).
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747-400 MAINTENANCE MANUAL
 COOLING AIR CHECK VALVE - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the cooling air check valves. One check valve is installed in each ram-air inlet duct.
 TASK 21-51-14-004-001
 2.  Cooling Air Check Valve Removal (Fig. 401)_______________________________
 A.  References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
IPC 21-62-56 Fig. 1 and 2

 B.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panel
 191F-L Air Conditioning Access Panel
 191N-L Air Conditioning Access Door
 192F-R Air Conditioning Access Panel

 C.  Prepare for the Removal
 S 864-002
 (1)  Turn the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, to the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-003
 (2) Open the applicable access door or panel (Ref 06-09-03/201):
 -191FL for pack 1 (panel)
 -191NL for pack 2 (door)
 -192FR for pack 3 (panel)
 D.  Remove the Check Valve
 S 034-004
 (1)  Remove the clamp upstream of the check valve.
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