36-11-05
 ALL  ú ú 01 Page 626 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PRESSURE REGULATING AND SHUTOFF VALVE - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure contains three tasks. The first task removes the pressure regulating and shutoff valve (PRSOV). The second task installs the PRSOV. The third task performs a post installation test of the PRSOV.
 B.  The pressure regulating and shutoff valve is electrically actuated and pneumatically controlled by the bleed air regulator. It is used to supply bleed air, at the correct pressure, to the main manifold.
 C.  The PRSOV is found above each engine core, forward of the bleed air precooler.
 D.  The valve can be manually operated to the closed or the locked closed position.
 TASK 36-11-15-004-001
 2.  PRSOV Removal (Fig. 401-403)_____________
 A.  References
 (1)
AMM 36-05-00/201, Pneumatic Systems

 (2)
AMM 71-11-04/201, Fan Cowl Panel

 (3)
AMM 78-31-00/201, Thrust Reverser System

 B.  Access
 (1)  
Location Zones
 502/503 Fan Cowl - Left Nacelle
 504/505 Thrust Reverser - Left Nacelle
 602/603 Fan Cowl - Right Nacelle
 604/605 Thrust Reverser - Right Nacelle

 (2)  
Access Panels
 5737/5837 Fan Cowl Assy
 5738/5838 Thrust Reverser Cowl Assy
 5739/5839 Thrust Reverser Cowl Assy
 5746/5846 Fan Cowl Assy

 C.  Prepare to Remove the PRSOV
 S 864-072
 (1) Make sure the applicable engine is not in operation.
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 36-11-15
 ALL  ú ú 02 Page 401 ú Nov 15/94
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A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 864-073Put the forward thrust lever in the fully rearward position and attach a DO-NOT-OPERATE tag.
 (3)  S 864-074Put the start lever in the CUTOFF position and attach a DO-NOT-OPERATE tag.
 S 864-002

 WARNING: YOU MUST REMOVE THE PRESSURE FROM THE PNEUMATIC DUCTS BEFORE
_______ YOU REMOVE A PNEUMATIC SYSTEM COMPONENT. IF YOU DO NOT REMOVE THE PRESSURE FROM THE PNEUMATIC DUCTS, HOT HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Remove the pressure from the pneumatic system (AMM 36-05-00/201).

 S 864-071

 (5)  
Open the applicable circuit breaker for the bleed air control on the P6 panel and attach the DO-NOT-CLOSE tag.

 S 864-075

 (6)  
Attach a DO-NOT-CLOSE tag to the applicable BLEED switch.

 S 044-003
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (7)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 014-004

 (8)  
Open the fan cowl panels (AMM 71-11-04/201).

 S 014-005
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (9)  Open the thrust reversers (AMM 78-31-00/201).
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 36-11-15
 ALL  ú ú 02 Page 402 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D.  Remove the PRSOV
 S 034-039
 (1)  Do these steps to remove the wire attachments for the PRSOV (Fig. 401):
 NOTE: To make the installation easier, keep the clamps attached
____
 to the wire bundle.

 (a)  
　
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