(a)  The BLEED 1 switch.
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A 737-300/400/500MAINTENANCE MANUAL

(4 LOCATIONS)

SENSE LINE
FWD

Precooler Control Valve Sensor Installation
Figure 401

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

 (c)  
The APU BLEED switch.

 S 014-005
 (4)  Open the access panels to get access to the sensor.
 D. Remove the Sensor
 S 034-026
 (1)  Disconnect the sense line and the union from the sensor.
 (a)  Discard the O-ring.
 S 034-006
 (2)  Remove the screws (4 locations) which hold the sensor to the duct.
 S 024-027
 CAUTION:_______THE THERMOSTAT CAN BE DAMAGED IF DROPPED OR MISHANDLED. IF THE THERMOSTAT IS DROPPED, RETURN IT TO THE SHOP OR SUPPLIER FOR CALIBRATION.
 (3)  
Remove the sensor from the duct.

 S 034-008

 (4)
Put a cap on the sense line to keep out unwanted material.

 S 034-009

 (5)  
Put a cover on the opening for the duct to keep out unwanted material.

 TASK 36-12-45-404-010
 3.  Precooler Control Valve Sensor Installation___________________________________________
 A. Consumable Material
 (1) D00006 - Antiseize Compound, NEVER SEEZ (AMM 20-30-21/201)
 B. References
 (1)  
AMM 20-30-21/201, Lubricants

 (2)  
AMM 36-05-00/201, Pneumatic system

 C. 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
 5726L/5826R Access Door Strut
 5729L/5829R Access Door Strut

 D. Install the Sensor
 S 864-011
 (1) Make sure the pressure is removed from the pneumatic ducts.
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737-300/400/500MAINTENANCE MANUAL
 S 434-012
 (2)  
Remove the cap from the sense line.

 S 434-013

 (3)  
Remove the cover from the opening for the pneumatic duct.

 S 644-014

 (4)  
Apply a thin layer of the antiseize compound to the external threads of the sense line for the union/sensor coupling.

 S 434-015

 (5)  
Install an O-ring on the union.

 (a)  
Connect the sense line union to the sensor.

 (b)  
Tighten the sense line.

 S 214-029
 (6)  Make sure the O-ring is installed on the sensor.
 S 424-028
 CAUTION:_______THE THERMOSTAT CAN BE DAMAGED IF DROPPED OR MISHANDLED. IF THE THERMOSTAT IS DROPPED, RETURN IT TO THE SHOP OR SUPPLIER FOR CALIBRATION.
 (7)  Use the screws (4 locations) to attach the sensor to the duct.
 (a)  Do not tighten the screws at this time.
 S 644-017
 (8)  
Apply a thin layer of the antiseize compound to the external threads of the sense line/union on the sensor coupling.

 S 434-018

 (9)  
Connect the sense line to the union on the sensor.

 S 434-019

 (10)
 Tighten the screws (4 locations) which connect the sensor to the duct.
　
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