21-61-41
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A
737-300/400/500MAINTENANCE MANUAL
 S 726-061
 (9)  
Compare the permitted range of resistance for that temperature to the resistance you wrote down.

 S 026-062

 (10)
 If the resistance is out of range, replace the sensor
 (AMM 21-61-41/401).

 F. Put the Airplane Back to Its Usual Condition
 S 416-065
 (1)  
Install the temperature controller (AMM 21-61-81/401).

 S 416-067

 (2)  
Install the center panel on the aft bulkhead in the forward cargo compartment if you removed it.

 S 416-068

 (3)  
Install the overhead ceiling panels (AMM 25-21-45/401) if you removed them.

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737-300/400/500MAINTENANCE MANUAL
 DUCT OVERHEAT SWITCHES - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  There are four overheat switches for the cabin.
 B.  There is a 190°F (88°C) and a 250°F (121°C) switch for each control system.
 C.  The switch installations are almost the same and are in the primary and the overhead distribution mainfolds.
 D.  Access to the switches is through the aft bulkhead of the forward cargo compartment and the overhead ceiling panel.
 TASK 21-61-51-004-001
 2.  Remove the Duct Overheat Switches (Fig. 401)_________________________________
 A.  References
 (1)  25-21-45/401, Sculptured Ceiling Panels
 B.  Access
 (1)  Location Zones
 107 Forward Half of Cabin
 210 Air Conditioning Distribution Bay

 C.  Prepare for the Removal
 S 864-002
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6-4 panel
 1) OVERHEAT

 S 014-024
 (2)  Get access to the duct overheat switches on the main distribution manifold for the control cabin:
 (a)  Remove the center panel of the aft bulkhead in the forward cargo compartment.
 S 014-025
 (3)  Get access to the duct overheat switches on the overhead distribution manifold for the passenger cabin:
 (a) Remove the overhead ceiling panels (Ref 25-21-45/401).
 D.  Remove the Duct Overheat Switch
 S 034-004
 (1)  
FOR THE 250°F (121°C) OVERHEAT SWITCH; Disconnect the electrical connector from the switch.

 S 034-005

 (2)  
FOR THE 190°F (88°C) OVERHEAT SWITCH; Cut the wire at the splice and disconnect the wire from the switch.

 (3)  
Remove the screws that attach the switch to the duct.

 S 034-006
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737-300/400/500MAINTENANCE MANUAL
 S 024-007
 (4)  Remove the switch and the gasket from the duct.
 TASK 21-61-51-404-008
 3.  Install the Duct Overheat Switch (Fig. 401)
________________________________
 A. Special Tools and Equipment ú (1) Temp-Cal Probe Heater BH 3884-40 (attachment to Jet-Cal engine ú analyzer) or ú H294 Temp-Cal Thermal Switch Tester or ú H394 Temp-Cal Tester with adapter cable BH405 ú ú BH24944 Heater Probe Kit (basic P/N) ú ú NOTE: There
____This kit is necessary to use the testers above. ú are different dash number kits for specific airplane model ú and tester combinations. Please consult with the supplier. ú ú Howell Instruments ú 3479 West Vickery Blvd. ú Fort Worth , Texas 76107 ú (a) Howell Heater Probe BH14130 - used to test overheat switch part ú numbers 67321-26-190, 67321-10-190, 67321-15-250, 67321-27-250 ú (b) Howell Heater Probe BH17336A - used to test overheat switch ú part numbers 1173T183-2 and 1173T212
　
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