S 434-020

 (11)
 Tighten the sense line.

 E. Put the Airplane to Its Usual Condition
 S 414-021
 (1)  
Close the access panels.

 S 434-022

 (2)  
Remove the DO-NOT-OPERATE tags from the BLEED 1, BLEED 2 and the APU BLEED switches on the P5 panel.

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 (3)  S 864-023Remove the DO-NOT-CLOSE tag and close the BLEED AIR circuit breaker on the P6 Panel.
 (4)  S 714-024Do the test for the sensor. (a) Use the engine to pressurize the pneumatic system (AMM 36-05-00/201). (b) Make sure the duct pressure becomes stable at 42 | 5 psi. (c) Remove the pressure from the pneumatic system if it is not necessary (AMM 36-05-00/201).

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A
737-300/400/500MAINTENANCE MANUAL
 450°F THERMOSTAT - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the 450°F Thermostat. The second task installs the 450°F Thermostat.
 B.  The 450°F Thermostat is found downstream of the precooler. It is on the top aft strut on the right side. It is aft of the sensor for the precooler control valve on each engine.
 TASK 36-12-55-004-001
 2.  450°F Thermostat Removal________________________
 A.  References
 (1)  AMM 36-05-00/201, Pneumatic System
 B.  Access
 (1)  
Location Zones
 507 Strut - Left Nacelle
 508 Aft Strut Fairing - Left Nacelle
 607 Strut - Right Nacelle
 608 Aft Strut Fairing - Right Nacelle

 (2)  
Access Panels
 5826 Access Door Strut
 5829 Access Door Strut

 C.  Prepare to Remove the 450°F Thermostat
 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.
 (1)  
Remove the pressure from the pneumatic system (AMM 36-05-00/201).

 S 864-003

 (2)  
Open the BLEED AIR circuit breaker on the P6 Panel and attach a DO-NOT-CLOSE tag.

 S 864-024

 (3)  
Attach a DO-NOT-OPERATE tag to the switches that follow on the P5 panel:

 (a)  BLEED 1
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REDUCER
O-RING

PRECOOLER CONTROL
VALVE SENSOR (REF)

PNEUMATIC DUCT

FWD

450`F Thermostat Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 (b)  
BLEED 2

 (c)  
APU BLEED

 S 014-004
 (4)  Open the access panel to get access to the thermostat.
 D. Remove the 450°F Thermostat
　
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