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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 D.

E.
F.
G.
A
747-400 MAINTENANCE MANUALPrepare for the Installation S 032-060
 (1)  Remove the plug from the vent on the water separator (1).
 (2)  S 962-028If the seals (3, 6) in the duct flanges are damaged, worn, or have a crack, then replace the seals.

Install the Water Separator
 S 422-029
 (1)  Put the water separator (1) in its position in the applicable air cooling pack.
 (a)  Make sure the water drain boss is at the lowest position on the water separator.
 S 432-061
 (2)  Install the couplings (2, 5) on each end of the water separator (1).
 (a)  Tighten the coupling nuts to 60 - 80 pound-inches
 (6.78 - 9.03 newton-meters).
 S 722-030
 (3)  Make sure the total resistance across each coupling is less than
 0.010 ohms (Ref 20-22-01/601).
 S 432-031
 (4)  Connect the water drain hose (4) to the drain tube connection
 (approximately 18 inches (0.45 meters) from the water separator).Do the Installation Test for the Water Separator
 S 862-034
 (1)  
Remove the DO-NOT-OPERATE tag from the applicable PACKS selector, on the P5 panel.

 S 862-035

 (2)  
Operate the applicable air conditioning pack (Ref 21-00-00/201).

 S 792-036

 (3)  
Feel for leaks around the water separator.

 (a)  Small leaks are permitted.

 (b)
You must repair the large leaks.Put the Airplane Back to Its Usual Condition

 S 412-037

 (1)  
Close the applicable access door, 191N-L or 192H-R (Ref 06-09-03/201).

 (2)  
Shut down the air conditioning pack (Ref 21-00-00/201).

 S 862-038
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 COMPRESSOR BYPASS CHECK VALVE - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the compressor bypass check valve. One compressor bypass check valve is installed in each air cooling pack.
 TASK 21-51-06-004-001
 2.  Compressor Bypass Check Valve Removal (Fig. 401)_____________________________________
 A.  References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
IPC 21-51-06 Fig. 1

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

 (2)  
Access panel
 191A-L Air Conditioning Access Door
 191H-L Air Conditioning Access Door
 192A-R Air Conditioning Access Door

 C.  Prepare for the Removal
 S 864-002
 (1)  Make sure the applicable (1, 2, or 3) PACK selector, on the overhead panel, P5, is in the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-004
 (2)  Open the applicable access door (Ref 06-09-03/201):
 -191A-L for pack 1
 -191H-L for pack 2
 -192A-R for pack 3
 D.  Remove the Check Valve
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 21-51-06
　
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