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 B.  In the forward cargo compartment one blowout panel is located in the forward bulkhead, another is in the aft bulkhead, and the third is located in the ceiling lining. Two blowout panels in the aft cargo compartment are located in the ceiling lining (Fig. 1).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PRESSURE AND RELIEF VALVE - REMOVAL/INSTALLATION
___________________________________________________
 1.  General
_______
 A.  This procedure has three tasks. The first task gives instructions for the removal of the pressure and relief valve. The second task gives instructions for the installation of the pressure and relief valve. The third task gives instructions for an operational test of the pressure and relief valve.
 B.  The pressure and relief valve is a spring-loaded flapper valve. The valve will open when the ambient pressure is approximately 1.0 psi more than the cabin pressure.
 TASK 21-32-11-004-001
 2.  Pressure and Relief Valve Removal (Fig. 401)
____________________________________________
 A.  Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 B.  Procedure
 S 014-002
 (1)  
Remove the aft bulkhead panel (right) in the aft cargo compartment to get access to the pressure and relief valve.

 S 024-011

 (2)  
Remove the relief valve door from the frame:

 (a)  
Remove the valve hinge bolts.

 (b)  
Disengage the spring from the frame anchor hole.

 

 NOTE: Do not permit the spring to move suddenly out of the
____ frame anchor hole. Hold the spring while you lower it against the relief valve door.
 (c)  Remove the relief valve door.
 S 034-012
 (3)  Remove the spring from the relief valve door:
 (a)  Remove the fasteners which hold the spring support retainer to the relief valve door and remove the retainer.
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A

737-300/400/500MAINTENANCE MANUAL
PRESSURE AND RELIEF VALVE SEE A
RELIEF 
VALVE DOOR 
SPRING SCALE 
LOCATION 
SEAL 
2.92 
|0.20  FWD 
OUTB  INCHES 

A-A  AFT CARGO COMPARTMENT
FRAME ANCHOR HOLE FOR SPRING SLOT
A SPRING
SPRING (2 LOCATIONS) DOOR LUG
SPRING SUPPORT ROD
VALVE HINGE BOLT (2 LOCATIONS)
FRAME SPRING SUPPORT RETAINER A SPRING TANG
RETAINERRELIEF VALVE FASTENERSDOOR
PRESSURE AND RELIEF VALVE
FWD INBD
A
Pressure and Relief Valve Installation Figure 401
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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Hold the spring while you remove the spring support rod.

 (c)  
Disengage the spring from the anchor hole in the relief valve door.

 NOTE: The spring will turn approximately 360°.
____
 TASK 21-32-11-404-009
 3.  Pressure and Relief Valve Installation (Fig. 401)_________________________________________________
 A. Consumable Materials
 (1)  D00013 Grease - MIL-G-23827 (AMM 20-30-21/201)
 B. Access
 (1)  Location Zone
 220 Aft Cargo Compartment Equipment Bay

 C. Procedure
 S 434-013
 (1)  Install the spring to the relief valve door:
 (a)  
Put the spring on the spring support rod.
　
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