S 865-009

 (2)
Remove the pressure from the pneumatic system (AMM 36-05-00/201).

 S 025-011

 (3)  
AIRPLANES WITH ASPIRATED TAT TUBE;
 Do the steps that follow:

 (a)  
Remove the cap from the open end of the aspirated TAT tube.

 (b)  
Remove the cap from the open boss from the pneumatic manifold duct.

 (c)  
Reconnect the aspirated TAT tube to the open boss on the pneumatic duct.

 (4)
Close the access doors and panels that were opened for the test.

 S 415-040
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 36-12-25
 ALL  ú ú 01 Page 511 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 BLEED AIR PRECOOLER - APPROVED REPAIRS
______________________________________
 1.  General
 A.  This procedure contains the task to repair the flanges of the precooler while the precooler is installed on-wing.
 TASK 36-12-25-308-001
 2.  Precooler Flange Repair_______________________
 A.  Equipment
 (1)  Flange Reforming Tool, Adams Flange Spider
 Adams-Bird, Inc.
 5296 Pebbletree Way
 San Jose, CA 95111

 U. S. A.
 B.  References
 (1)  AMM 36-19-15/401 - Ducts
 C.  Access
 (1)  
Location Zones
 502/503 Fan Cowls - Left Nacelle
 504/505 Thrust Reversers - Left Nacelle
 602/603 Fan Cowls - Right Nacelle
 604/605 Thrust Reversers - 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

 D.  Procedure
 S 018-002
 (1)  
Get access to the precooler flange that you will repair.

 (2)
Use the flange reforming tool and repair the precooler flange.

 S 028-004

 (3)  
If you cannot repair the precooler flange while the precooler is installed, remove the duct or precooler to get access to the damaged flange (AMM 36-19-15/401 or AMM 36-12-25/401).

 (a)  
Repair the precooler flange with the flange reforming tool.

 (b)  
Install the duct or precooler (AMM 36-19-15/401 or AMM 36-12-25/401).

 S 368-003
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-12-25
 ALL  ú ú 01 Page 801 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PRECOOLER CONTROL VALVE - REMOVAL/INSTALLATION
______________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task removes the precooler control valve. The second task installs the precooler control valve.
 B.  The precooler control valve controls the volume of engine fan air which goes through the bleed air precooler. This fan air is used to decrease the temperature of the bleed air which goes to the main manifold.
 C.  The precooler control valve is found on the top of the engine core. A coupling attaches the control valve to the inlet duct for the fan air. A compressed contact seal connects the control valve to the bleed air precooler.
 TASK 36-12-35-004-001
 2.  Precooler Control Valve Removal (Fig. 401)
_______________________________
 A.  References
 (1)  
AMM 36-05-00/201, Pneumatic System

 (2)  
AMM 36-12-25/401, Bleed Air Precooler

 (3)  
AMM 71-11-04/201, Fan Cowl Panels

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 B.  Access
 (1)  
Location Zones
 502/602 Fan Cowls - Left Nacelle
　
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