S 024-006

 (2)  
Remove the check valve:

 (a)  
Loosen the clamps that secure the check valve to the ducts.

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

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SEE  A  (REF) MIX MANIFOLD
RECIRCULATION FAN (REF) 
CHECK VALVE  FWD  SEE B CHECK VALVE  AIR-CONDITIONING PACK COLD AIR FROM RIGHT AIR-CONDITIONING PACK COLD AIR FROM LEFT A 
FLOW ARROW 
DUCT 
DUCT 
FWD 
CLAMPS B CHECK VALVE  Check Valve (Cold Air) Installation Figure 401

 C40179
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737-300/400/500MAINTENANCE MANUAL
 (c)  
Remove the check valve.

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

 TASK 21-21-04-404-007
 3.  Install the Check Valve (Cold Air) (Fig. 401)__________________________________
 A. References
 (1)  
12-31-01/201, Zone Diagrams

 (2)  
24-22-00/201, Manual Control

 (3)  
36-05-00/201, Pneumatic System

 B. Access
 (1)  Location Zone (AMM 12-31-01/201)
 210 Air Conditioning Distribution Bay

 C. Procedure
 S 424-008
 (1)  Install the check valve:
 (a)  
Remove the duct covers.

 (b)  
Install the check valve between the ducts.

 NOTE: The flow arrow on the check valve must point forward.

 (c)  
Move the clamps onto the check valve.

 (d)  
Tighten the clamps.

 D. Do a Leakage Test of the Check Valve
 S 864-009
 (1)
Supply pneumatic power to the airplane (AMM 36-05-00/201).

 S 864-010

 (2)  
Set the applicable pack switch to the AUTO position.

 S 794-011

 (3)  
Examine the check valve for leakage:

 (a)  
A small leak is O.K.

 (b)  
You must repair a large leak.

 E. Put the Airplane Back to Its Usual Condition
 S 414-012
 (1)  
Install the panel on the aft bulkhead in the forward cargo compartment that was removed to get access.

 S 864-013

 (2)  
Remove the pneumatic power from the airplane if it is no longer necessary (AMM 36-05-00/201).

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 S 864-014
 (3)  Remove the electrical power from the airplane it it is no longer necessary (AMM 24-22-00/201).
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 GROUND SERVICE CONDITIONED AIR CONNECTION DUCT AND CHECK
________________________________________________________ VALVE ASSEMBLY - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  A hinge on the duct and check valve assembly has a spring which holds the swing check valve almost open when the air conditioning system is off. When the air conditioning system is on, the pressure in the air distribution ducts causes the swing check valve to close. Before you install the duct and check valve assembly, you must do a check of the swing check valve and adjust the hinge if it is necessary. The swing check valve must open and close correctly.
　
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