S 864-018
 (7)  
Put the temperature selector to the MANUAL WARM position to move the mixture valve from the fully COLD position.

 S 714-019

 (8)  
Put the temperature selector to the AUTO COOL position and make sure the mixture valve goes to the fully COLD position.

 S 714-020

 (9)  
Put the temperature selector to the MANUAL WARM position.

 S 714-027

 (10)
 Make sure the mixture valve moves to the WARM position.

 S 864-028

 (11)
 Put the temperature selector to the OFF position.

 S 864-021

 (12)
 Put the L PACK switch to the OFF position.

 S 864-022

 (13)
 Remove the pressure in the pneumatic system if it is not necessary (Ref 36-05-00/201).

 S 864-023

 (14)
 Remove the electrical power if it is not necessary (Ref 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CONTROL CABIN TEMPERATURE SENSOR - INSPECTION/CHECK
___________________________________________________
 1.  General_______
 A.  There is one task in this procedure which is the control cabin
 temperature sensor check.

 TASK 21-61-61-286-009
 2.  Control Cabin Temperature Sensor Resistance Check (Fig. 601)_________________________________________________
 A.  General
 (1)  This procedure is a check of the calibration of the sensor while the sensor is installed. Because you can not find the temperature of the sensor accurately while it is installed in the pack, this check is for system troubleshooting only.
 B.  Equipment
 (1)  Digital Multimeter, High Impedence (alternative)
 NOTE: The digital multimeter must be specifically selected to
____ minimize self-heating of the sensor element. The instrument must limit the current through the sensor to less than 100 microamperes. If you use resistance measuring instruments without this current-limiting feature you will get an error in resistance value due to self-heating of the sensor element.
 (2)  
Digital Multimeter, Hewlett Packard Model 3465A (alternative)

 (3)  
Thermometer (capable of measuring temperature in degrees F to an accuracy of plus or minus 1 degree F from -40 to 140 degrees F)

 C.  References
 (1)  
AMM 21-61-81/401, Temperature Controller

 (2)  
AMM 21-61-61/401, Control Cabin Temperature Sensor

 D.  Access
 (1)  Location Zone
 101 Control Cabin, Left

 E.  Procedure
 S 016-018
 (1)  
Remove the temperature controller (AMM 21-61-81/401).

 S 976-002

 (2)  
Find the inlet grille that contains the temperature sensor immediately forward of the control cabin door and approximately six inches from the center on the left side.

 S 976-003

 (3)  
Measure the temperature in the flight compartment adjacent to the inlet grille.

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 ALL  ú ú 01 Page 601 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TEMPERATURE (`F)  RESISTANCE (OHMS) 
-40  36,820-52,340 
-35  31,650-44,260 
-30  27,290-37,540 
-25  23,570-31,960 
-20  20,440-27,270 
-15  17,750-23,350 
-10  15,460-20,050 
-5  13,500-17,260 
0  11,830-14,880 
5  10,380-12,880 
10  9,130-11,170 
15  8,050-9,710 
20  -7,110 8,460 
25  -6,280 7,410 
30  -5,580 6,470 
35  -4,960 5,680 
40  4,410-4,100 
45  -3,940 4,400 
50  -3,520 3,890 
　
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