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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Examine the valve for leakage at the V-band clamps. 1) Diffused leakage is permitted. 2) You must repair jet blast leakage.

 (c)  
Remove the pressure from the pneumatic system (Ref 36-05-00/201).

 D. Put the Airplane Back to Its Usual Condition
 S 414-013
 (1) Close the door for the air conditioning equipment bay.
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A 737-300/400/500MAINTENANCE MANUAL
 APU PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task removes the APU pressure relief valve. The second task installs the APU pressure relief valve.
 TASK 36-11-61-004-001
 2.  APU Pressure Relief Valve Removal
_________________________________
 A.  References
 (1)  36-05-00/201, Pneumatic System
 B.  Access
 (1)  
Location Zones
 701 Tail Compartment

 (2)  
Access Panels
 3701 Stabilizer Trim Access Door

 C.  Prepare to Remove the Valve
 S 864-002
 (1)  
Make sure the APU is not in operation.

 S 864-003

 (2)  
Make sure the engines are not in operation.

 S 864-004

 (3)
Remove the pressure from the pneumatic system (Ref 36-05-00/201).

 S 864-005

 (4)  
Attach DO-NOT-CLOSE tags to the BLEED switches.

 S 014-006

 (5)  
Open the stabilizer trim access door, 3701, to get access to the valve.

 D.  Remove the Valve (Fig. 401)
 S 034-007
 (1)  
Remove the lockwire.

 (2)  
Loosen the valve.

 S 024-009

 (3)  
Remove the valve from the mounting boss on the manifold duct for the APU.

 S 034-008
 NOTE: You will remove the packing ring with the valve.
____
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A 737-300/400/500MAINTENANCE MANUAL

APU Pressure Relief Valve Installation
Figure 401

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737-300/400/500MAINTENANCE MANUAL
 TASK 36-11-61-404-010
 3.  APU Pressure Relief Valve Installation (Fig. 401)______________________________________
 A. Consumable Materials
 (1) D00006 - Antiseize Compound, NEVER SEEZ (AMM 20-30-21/201).
 B. References
 (1)  
20-30-21/201, Lubricants

 (2)  
36-05-00/201, Pneumatic System

 C. Access
 (1)  
Location Zones
 701 Tail Compartment

 (2)  
Access Panels
 3701 Stabilizer Trim Access Door

 D. Install the Valve
 S 964-011
 (1)  
Replace the packing ring on the pressure relief valve for the APU.

 S 624-012

 (2)  
Apply a thin layer of the antiseize compound to the threads of the valve.

 S 424-013

 (3)  
Install the valve in the mounting boss on the duct.

 (a)  
Tighten the valve.