NOTE: Use the coupling gage to measure the dimension.
____
 (i)  Install the lockwire between the coupling nut and the coupling (AMM 20-10-44/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CHECK VALVE (HOT AIR) - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  Two tasks are supplied in this procedure. The first task is the removal of the check valve in the duct that supplies hot air to the mix muff in the distribution bay. The second task is the installation of the check valve.
 B.  One check valve is installed in each of the air-conditioning bays. The removal and installation procedure is the same for each check valve.
 TASK 21-51-04-004-001
 2.  Remove the Check Valve (Hot Air) (Fig./401)________________________________
 A.  References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
12-31-31/201, Body Station 46 Access Doors and Panels

 (3)  
24-22-00/201, Manual Control

 (4)  
36-05-00/201, Pneumatic Systems

 B.  Access
 (1)  
Location Zones (AMM 12-31-01/201)
 212 Left Air-Conditioning Equipment Bay
 214 Right Air-Conditioning Equipment Bay

 (2)  
Access Panels (AMM 12-31-31/201)
 3303 - Left Air-Conditioning Access Panel
 3403 - Right Air-Conditioning Access Panel

 C.  Prepare for the Removal of the Check Valve
 S 864-002
 (1) Supply electrical power to the airplane (AMM 24-22-00/201).
 S 864-003
 WARNING:_______REMOVE THE PRESSURE FROM THE PNEUMATIC SYSTEM. PRESSURE IN THE PNEUMATIC SYSTEM CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Remove the pressure from the pneumatic system (AMM 36-05-00/201).

 S 864-004

 (3)  
Set the L PACK and R PACK switches on the air conditioning module (P5-10 panel) to the OFF position.

 (a)  Install DO-NOT-OPERATE tags on the switches.
 S 014-005
 (4)  Lower the applicable air-conditioning panel:
 (a)  3303 - Left Air-Conditioning Access Panel
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE  A  SEE B HOT AIR TO MIX MUFF CHECK VALVE  SEE B WATER SEPARATOR (REF) CHECK VALVE AIR CYCLE MACHINE (REF) 
WATER SEPARATOR (REF) 
FWD 
DUCT FLOW ARROW  CHECK VALVE  A 
DUCT 
FWD 
CLAMPS B CHECK VALVE  Check Valve (Hot Air) Installation Figure 401 

C40216
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b) 3403 - Right Air-Conditioning Access Panel
 D. Procedure
 S 024-006
 (1)  Remove the check valve:
 (a)  
Loosen the clamps that hold the check valve to the ducts.

 (b)  
Move the clamps away from the check valve.

 (c)  
Remove the check valve.

 (d)  
Put covers on the duct openings to prevent the entry of unwanted material.

 TASK 21-51-04-404-015
 3. Install the Check Valve (Hot Air) (Fig./401)
_________________________________
 A. References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
12-31-31/201, Body Station 46 Access Doors and Panels
　
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