(EXAMPLE) SLEEVE (EXAMPLE) CLAMP CLAMSHELL  BRACKET 
(EXAMPLE) O-RING LINE AIR  ADAPTER  VALVE CHECK  SPACER 
BOLT  WASHER  MANIFOLD PNUEMATIC FROM AIR LINE 
FILTER AIR 
A 
VALVE (REF) RELIEF PRESSURE 
PRESSURE SWITCH (REF)  MANIFOLD PRESSURIZATION 
SHOWN) CLAMP NOT (SLEEVE AND CONNECTION CLAMSHELL VALVE CHECK UNLOADER  FWD  INBD 
AIR LINE COMPRESSOR FROM THE 
B 
Figure 401 (Sheet 2) Check Valve Installation 

C81952
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 38-15-65
 ú ú 01 Page 403 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (2)  
Do this task: "Water System Depressurization" (AMM 38-15-60/201).

 S 014-004

 (3)  
For the ceiling panels in the area between RBL 35 and RBL 55 from stations 840 to 860, do this task: "Containerized Cargo Compartment Ceilings and Sidewall Linings - Removal" (AMM 25-52-01/401).

 S 034-005

 (4)  
Remove the two clamshell couplings that are installed upstream and downstream from the check valve.

 S 034-006

 (5)
Move the sleeves for the coupling away from the check valve.

 S 034-007

 (6)  
Remove the two screws, washers and spacers that hold the in-line filter on the bracket.

 S 024-008

 (7)  
Remove the in-line filter with the check valve and the adapters attached.

 S 034-009

 (8)
Disconnect the adapter from the outlet side of the check valve.

 S 034-010

 (9)
Disconnect the check valve from the outlet side of the filter.

 S 034-011

 (10)
 Remove and discard the five used O-rings.

 TASK 38-15-65-654-012
 3.  Install the Check Valve_______________________
 A. References
 (1)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (2)  
AMM 36-00-00/201, Pneumatic

 (3)  
AMM 38-15-60/201, Water Tank Pressurization

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment Aft Half, Right
 C. Consumable Materials
 (1)  D00463 Lubricant - White Protopet 1S (WITCO Corp, New York, NY 07804)
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A
747-400 MAINTENANCE MANUAL
 D. Procedure
 S 864-013
 (1)  
Make sure the ends that connect are clean.

 S 644-014

 (2)  
Put a thin layer of lubricant on the five new O-rings.

 S 434-015

 (3)  
Put the O-rings in their installed positions.

 S 434-016

 (4)  
Connect the check valve to the outlet side of the filter.

 S 434-017

 (5)  
Connect the adapter to the outlet side of the check valve.

 S 424-018

 (6)  
Put the check valve with the connected parts on the bracket.

 S 434-019

 (7)  
Install loosely the spacer, washer and screws that hold the in-line air filter on the bracket.

 S 434-020

 (8)  
Install the two clamshell couplings.

 (a)  
Make sure the ends that connect are in line and not more than

 0.28 inch apart.

 (b)  
Move the sleeve until it is in the center of the connection.

 (c)  
Put the clamshell over the connection and latch the fasteners.

 S 434-021
 (9)
Tighten the screws that hold the in-line air filter on the bracket.

 S 864-022

 (10)
 Do one of these tasks if it is necessary to pressurize the pneumatic system (AMM 36-00-00/201):

 (a)  
　
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