(1)  
12-31-01/201, Zone Diagrams

 (2)  
12-31-91/201, Nacelle and Engine-To-Wing Access Doors and Panels

 (3)  
24-22-00/201, Manual Control

 (4)  
36-05-00/201, Pneumatic System

 (5)  
36-11-05/501, Engine Bleed Air Distribution System

 (6)  
36-11-15/401, Pressure Regulating and Shutoff Valve

 (7)  
36-11-16/401, Bleed Air Regulator

 (8)  
36-11-85/401, High Stage Valve

 (9)  
36-11-86/401, High Stage Regulator

 (10)
 36-12-35/401, Precooler Control Valve

 (11)
 78-31-00/201, Thrust Reverser SystemAccess

 (1)  
Location Zone (Ref 12-31-01/201)

 (a)  
503, Left Nacelle - Right Half Fan Cowl

 (b)  
504, Left Nacelle - Left Half Thrust Reverser

 (c)  
505, Left Nacelle - Right Half Thrust Reverser

 (d)  
603, Right Nacelle - Right Half Fan Cowl

 (e)  
604, Right Nacelle - Right Half Fan Cowl

 (f)  
605, Right Nacelle - Right Half Thrust Reverser

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 (2)  Access Panels (Ref 12-31-91/201)
 (a)  
5737 - Left Engine, Right Half Fan Cowl Assembly

 (b)  
5738 - Left Engine, Left Half Thrust Reverser Assembly

 (c)  
5739 - Left Engine, Right Half Thrust Reverser Assembly

 (d)  
5746 - Left Engine, Left Half Fan Cowl Assembly

 (e)  
5837 - Right Engine, Right Half Fan Cowl Assembly

 (f)  
5838 - Right Engine, Left Half Thrust Reverser Assembly

 (g)  
5839 - Right Engine, Left Half Thrust Reverser Assembly

 (h)  
5846 - Right Engine, Right Half Fan Cowl Assembly

 F. Prepare To Do The Engine Bleed Air System Inspection/Check
 S 866-002
 (1)  
Supply electrical power to the airplane (Ref 24-22-00/201).

 S 866-003

 (2)  
Set the ISOLATION valve switch on the P5-10 Air-Conditioning Module to the CLOSE position.

 S 016-004

 (3)  
Open the fan cowl assemblies (Ref 78-31-00/201).

 S 016-005

 (4)  
Open the thrust reverser assemblies (Ref 78-31-00/201).

 S 866-006

 (5)
Remove the electrical power from the airplane (Ref 24-22-00/201).

 G. Examine the Precooler Control Valve System
 S 216-134
 (1)  Use a mirror to examine the precooler control valve position indicator.
 (a)  
If the position indicator is in the CLOSED position, replace the precooler control valve (AMM 36-12-35/401), then go to step G.(14).

 (b)  
If the position indicator is in the full OPEN position, continue.

 S 026-007
 (2)  
Disconnect the Precooler Control Valve supply pressure line from the left side of the Precooler Control Valve.

 S 426-008

 (3)  
Install the NAS1762J0606 90° Elbow fitting on the Precooler Control Valve supply pressure port - (OPTIONAL).

 (4)  
Remove Test Set Cap No. 4.

 S 026-009
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL VALVE
SEEA B
INDICATOR POSITION VISUAL  1 DRIVE WRENCHING MANUAL  PRECOOLER CONTROL VALVE SUPPLY PRESSURE PORT 
FWD
(EXAMPLE) ACTUATING TEST SET PORTABLE VALVE  PRECOOLER CONTROL VALVE (LEFT SIDE) 

FWD
A
TYPE A PRESSURE HOSE
TEST SET
　
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