S 434-009
 S 414-006
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A 737-300/400/500MAINTENANCE MANUAL

Equipment Cooling Blower Check Valve Installation
Figure 401

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A 737-300/400/500MAINTENANCE MANUAL

Equipment Cooling Blower Installation
Figure 401A

F88825
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A
737-300/400/500MAINTENANCE MANUAL
 EQUIPMENT COOLING BLOWER CHECK VALVES - INSPECTION/CHECK
________________________________________________________
 1.  General_______
 A.  There is one task in this procedure which is to examine the equipment cooling blower check valve.
 B.  AIRPLANES WITH A SEPARATELY INSTALLED CHECK VALVE FOR EACH BLOWER; There are two check valves. One check valve is downstream of the main blower for the equipment cooling system. The second check valve is downstream of the alternate blower for the equipment cooling system. The check valves and the blowers are adjacent to each other.
 C.  AIRPLANES WITHOUT A SEPARATELY INSTALLED CHECK VALVE FOR EACH BLOWER; There are two check valves. One check valve is downstream of the main blower for the equipment cooling system. The second check valve is downstream of the alternate blower for the equipment cooling system. The check valves are part of the equipment cooling blowers.
 TASK 21-58-51-206-010
 2.  Equipment Cooling Blower Check Valve Examination________________________________________________
 A.  General
 (1)  This procedure is a check of the equipment cooling blower check valve to see if the check valve is damaged.
 B.  References
 (1)  
AMM 21-58-12/401, Equipment Cooling Blower - R/I

 (2)  
AIRPLANES WITH A SEPARATELY INSTALLED CHECK VALVE FOR EACH BLOWER; AMM 21-58-51/401, Equipment Cooling Blower Check Valve - R/I

 C.  Access
 (1)  Location Zone
 205 Electronic Compartment

 D.  Procedure
 S 026-011
 (1)  
Remove the equipment cooling blower (AMM 21-58-12/401).

 S 026-009

 (2)  
AIRPLANES WITH A SEPARATELY INSTALLED CHECK VALVE FOR EACH BLOWER; Do the steps that follow:

 (a)  
Remove the check valve (AMM 21-58-51/401).

 (b)  
Hold the check valve with the clappers pointed away from you.

 (c)  
Use your hand to turn the synchronizer counterclockwise until it stops.

 (d)  
Release the synchronizer.

 (e)  
Examine the check valve for these faults: 1) Clappers do not go back to 15 degrees or less of the fully

 closed position 2) Valve clappers bind or scrape when moved
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A 737-300/400/500MAINTENANCE MANUAL
BULKHEAD
PANEL

ELECTRONIC EQUIPMENT COMPARTMENT DUCTEQUIPMENT COOLING BLOWERS FORWARD BULKHEAD
SEE  A  SHROUD OXYGEN BOTTLE
BLOWER MAIN 

ALTERNATE BLOWER
FWD
DUCT CHECK VALVE (BELOW THE FLEXIBLEFLEXIBLE DUCT, EACH BLOWER)DUCT
　
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