S 215-140
 (6)  
Make sure that the indicator needle of the CONT CABIN - AIR MIX VALVE indicator moves toward HOT.

 S 865-141

 (7)  
Move the L PACK switch to OFF.

 J. Operational Test - Duct Overheat Protection (Passenger Cabin)
 S 215-142
 (1)
Move the AIR TEMP switch to SUPPLY DUCT, on the P5-17 panel.

 S 865-143

 (2)  
Move the R PACK switch to AUTO or HIGH, on the P5-10 panel.

 S 865-144

 (3)  
Move the PASS CABIN temperature selector switch to MANUAL OFF, on the P5-17 panel.

 S 865-145

 (4)  
Move the PASS CABIN temperature selector switch intermittently to MANUAL WARM while you do these steps:

 NOTE: This will cause the air mix valve to move slowly toward the
____
 hot position.

 (a)  Monitor these indicators and lights: 1) Temperature indicator, on the P5-17 panel 2) PASS CABIN - AIR MIX VALVE indicator, on the P5-17 panel 3) PASS CABIN - DUCT OVERHEAT light, on the P5-17 panel 4) Right and left PACK TRIP OFF lights, on the P5-10 panel 5) MASTER CAUTION lights, on the P7 panel
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A 737-300/400/500MAINTENANCE MANUAL
 (b)  Make sure that the temperature indication is at 170°F (76.5°C) when these conditions occur:
 NOTE: The temperature indication could be more than 170°F
____ (76.5°C) because of the tolerance of the temperature indication system, time lag, and the anticipation behavior of the thermal switch.
 1) The right and left PACK TRIP OFF lights stay off.
 2) The MASTER CAUTION lights come on.
 3) The PASS CABIN - DUCT OVERHEAT light comes on.
 4) The indicator needle of the PASS CABIN - AIR MIX VALVE

 indicator moves to the full COLD position.
 (c)  
Let the supply duct temperature decrease below 170°F (76.5°C).

 (d)  
Push the TRIP RESET switch, on the P5-10 panel.

 (e)  
Make sure that the MASTER CAUTION lights go off.

 S 865-146
 (5) Move the PASS CABIN temperature selector switch to MANUAL WARM.
 NOTE: This will cause the air mix valve to move to the full hot
____
 position.

 S 215-147
 (6)  
Make sure that the indicator needle of the PASS CABIN - AIR MIX VALVE indicator moves toward HOT.

 S 865-148

 (7)  
Move the R PACK switch to OFF.

 K. Put the Airplane Back to Its Usual Condition
 S 865-149
 (1)  
Release the pressure in the pneumatic system if it is not necessary (Ref 36-05-00/201).

 (2)  
Move the RECIRC FAN switch to AUTO, on the P5-10 panel.

 S 865-151

 (3)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

 S 865-150
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A
737-300/400/500MAINTENANCE MANUAL
 TASK 21-61-00-705-152
 4. Operational Test - 190°F and 250°F Duct Overheat Switches
_________________________________________________________
 A. Special Tools and Equipment
 (1) Temp-Cal Probe Heater BH 3884-40 (attachment to
 Jet-Cal engine analyzer) or H294 Temp-Cal Thermal Switch Tester or H394 Temp-Cal Tester with adapter cable BH405
 BH24944 Heater Probe Kit (basic P/N)
 NOTE: This kit is necessary to use the
____ testers listed above. There are different dash number kits for specific airplane model and tester combinations. Please consult with supplier.
 Howell Instruments
 3479 West Vickery Blvd.
 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 and ú 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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