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 A.  Two tasks are supplied in this procedure. The first task is the removal of the recirculation fan check valve (check valve). The second task is the installation of the check valve.
 B.  The check valve is installed in the air-conditioning distribution bay.
 TASK 21-21-24-004-001
 2.  Remove The Check Valve______________________
 A.  References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
24-22-00/201, Manual Control

 B.  Access
 (1)  Location Zone (Ref 12-31-01/201)
 (a)  210, Air-Conditioning Distribution Bay
 C.  Prepare To Remove The Check Valve
 S 864-002
 (1)
Supply electrical power to the airplane (Ref 24-22-00/201).

 S 864-003

 (2)  
Set these switches to the OFF position and attach DO-NOT-OPERATE identifiers:

 (a)  P5-10 Air-Conditioning Module
 1) L PACK
 2) R PACK
 3) RECIRC FAN

 S 014-009
 (3)  Remove this access panel:
 (a)  Access Panel, Right - Forward Cargo Compartment, Aft Bulkhead
 D.  Procedure
 S 024-020
 (1)  Remove the check valve:
 (a)  
Remove the clamps.

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

 (c)  
Remove the check valve.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

A

Recirculation Fan Check Valve
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 21-21-24-404-014
 3. Install The Check Valve
_______________________
 A. References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
24-22-00/201, Manual Control

 B. Access
 (1)  Location Zone (Ref 12-31-01/201)
 (a)  210, Air-Conitioning Distribution Bay
 C. Procedure
 S 424-015
 (1)  Install the check valve between the recirculation fan and the mix manifold:
 NOTE: Make sure the flow arrow points at the mix manifold.
____ Also, make sure the flappers move freely. If the flappers bind, replace the check valve.
 (a)  
Move the sleeves on to the check valve.

 (b)  
Install the clamps.

 (c)  
Tighten the clamps to 50 pound-inches.

 D. Put The Airplane Back To Its Usual Condition
 S 414-019
 (1)  
Install the removed access panel.

 (2)  
Remove the DO-NOT-OPERATE identifiers.

 S 864-022

 (3)  
Remove electrical power from the airplane if it is no longer necessary (Ref 24-22-00/201).

 S 864-021
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CONTROL CABIN CONDITIONED AIR DISTRIBUTION SYSTEM -
___________________________________________________ DESCRIPTION AND OPERATION
_________________________
 1.  General_______
 A.  The control cabin conditioned air distribution system consists of a series of ducts originating just upstream of the main distribution manifold and leading forward under the floor, on the left side of the airplane, to the control cabin, where it branches off into several risers which end at the ceiling, floor and foot level outlets. Orifices in the system balance the flow. An acoustical muffler is installed in the supply duct to reduce control cabin duct airflow noise. A small duct is tapped from the mix muff to add warm air to the control cabin conditioned air supply.
　
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