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 B.  This procedure does a test of the sensing element to find a defective element.
 TASK 26-18-11-735-001
 2.  Wing and Lower Aft Body Overheat Detection Sensing Element Test (Fig. 501)_______________________________________________________________
 A.  General
 CAUTION: FOR SENSING ELEMENTS IN THE STRUT AREAS
_______ OR THE WING LEADING EDGE; DO NOT USE A MULTIMETER ON THE SENSOR ELEMENTS IF THE ELEMENT'S TEMPERATURE IS ABOVE 210 DEGREES F (149 DEGREES C). IF THE TEMPERATURE IS BELOW 210 DEGREES F (149 DEGREES C) BUT ABOVE 70 DEGREES F (21 DEGREES C), LIMIT METER USE TO FIVE SECOND APPLICATIONS WITH NO MORE THAN 2 APPLICATIONS PER MINUTE. IF THE TEMPERATURE IS BELOW 70 DEGREES F (21 DEGREES C), THE METER MAY BE USED WITHOUT RESTRICTION. IF THESE REQUIREMENTS ARE NOT FOLLOWED, DAMAGE TO THE SENSOR ELEMENT MAY OCCUR.
 CAUTION: FOR SENSING ELEMENTS NOT IN THE STRUT AREA
_______ OR THE WING LEADING EDGE; DO NOT USE A MULTIMETER ON THE SENSOR ELEMENTS IF THE ELEMENT'S TEMPERATURE IS ABOVE 155 DEGREES F (68 DEGREES C). IF THE TEMPERATURE IS BELOW 155 DEGREES F (68 DEGREES C) BUT ABOVE 70 DEGREES F (21 DEGREES C), LIMIT METER USE TO FIVE SECOND APPLICATIONS WITH NO MORE THAN 2 APPLICATIONS PER MINUTE. IF THE TEMPERATURE IS BELOW 70 DEGREES F (21 DEGREES C), THE METER MAY BE USED WITHOUT RESTRICTION. IF THESE REQUIREMENTS ARE NOT FOLLOWED, DAMAGE TO THE SENSOR ELEMENT MAY OCCUR.
 (1)  
Obey this caution during all of this task.

 (2)  
Test sensing loop only when all units in the system are stabilized at ambient temperature. Failure of an element to meet the specification noted in the following paragraphs is cause for replacement.

 B.  Equipment
 (1)  
Multimeter

 (2)  
Wire End Fitting 35303-10, Fenwal Incorp., Ashland Mass. Wire End Fitting 35303-11, Fenwal Incorp., Ashland Mass.

 NOTE: The wire end fittings are to be used for attachment of
____ test equipment to the sensing element.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FAULT CODE FENWAL ALARM/  LOOP CONNECTOR AND LOCATION  RESISTANCE LOOP CENTER CONDUCTOR (75`F)  SENSORS 
24,22,20  pack Left forward A/C D858  Left aft A/C pack D856  6 ohms max  M274,M355 
34,32,30  Aft keel beam D854  Forward keel beam D848  6 ohms max  M272,M273 
44,42,40  Aft end of Section 58 D866  compartment aft cargo Forward end of D1070  12 ohms max  M275,M276,M347, M348,M1147 
14,12,10  Inboard left wing D832  Left engine strut cavity D1392  12 ohms max  M268,M370,M487, M1205 
64,62,60  pack Right aft A/C D846  strut cavity Right engine D1396  12 ohms max  M269,M271,M356, M371,M488,M1204 

____The resistance measurements in this table are for the detector elements
NOTE:
alone. The resistance measurements do not include connector resistances.
Sensing Loop Test Data
Figure 501

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 ALL  ú ú 01 Page 502 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 C.

D.
E.
A
737-300/400/500MAINTENANCE MANUAL
Access
 (1)
Location Zone

 (a)
212, 214 Left, Right Air Conditioning Equipment Bay

 (b)
216, 217 Left, Right Main Wheel Well

 (c)
218, Aft Body

 (d)  
303, 403, Wing Inboard Leading Edge

 (e)  
507, 607, Strut

 (f)  
701, Tail Compartment

 

 (g)
703, APU CompartmentSensing Element Test

 S 865-002

 (5)  
Attach the lockwire to the sensor element connectors. S 755-008

 (6)  
Repeat steps (1) through (6) for each remaining loop.

Put the Airplane to its Normal Condition. S 865-021

 (1)  
Remove the wire end fittings from the loop connectors. S 865-022

 (2)  
Connect the connectors to the sensing element. S 865-023
　
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