YES
SEE SHEET 3 (BLOCK 2)
NO
21 PUSH THE RIGHT WING BODY
OVERHEAT LIGHT, L33, TO MAKE
SURE THE BULB OPERATES.

DOES THE L33 LIGHT COME ON?
YES
NO

YES
YES

23 DO THE MEMORY READ PROCE-DURE (26-18-00/201) TO ISOLATE
THE FAULTY DETECTOR LOOP OR
CONTROLLER.

WERE ANY CONTROLLER FAULT CODES SHOWN?

42 REPLACE THE COMPARTMENT OVERHEAT CONTROL UNIT, M237 (WDM 26-12-11).
IF THE PROBLEM CONTINUES, ISOLATE THE ELECTRICAL FAULTBETWEEN PIN 18 OF THE D742 CONNECTOR AND THE RIGHT WING BODY OVERHEAT LIGHT, L33, ON THE P5-10 PANEL (WDM 26-12-11).

AND WING LEADING EDGE LOOP. SEE FIG. 105 FOR PROPER CON-NECTOR ASSEMBLY. DO THE MEMORY READ PROCEDURE.
WERE ANY DETECTOR LOOP FAULT CODES SHOWN?

YES

IF THE PROBLEM CONTINUES, DO BLOCK 45.
Right Wing Body Overheat Troubleshooting Diagram
Figure 104 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú

 26-18-00
 ú ú 01 Page 116 ú Jul 15/98
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A 737-300/400/500MAINTENANCE MANUAL

FROM THE CENTER CONDUCTOR OF THE DETECTION ELEMENT TO GROUND IN THE RIGHT STRUT AND WING LEADING EDGE LOOP. SEE ELECTRICAL SCHEMATIC 26-10-05 FOR DETECTOR ELEMENT AND CONNECTOR NUMBERS. TEST FOR CONTINUITY BETWEEN EACH DETEC-TOR'S CENTER CONDUCTOR AND GROUND TO ISOLATE THE SHORT CIRCUIT.
Right Wing Body Overheat Troubleshooting Diagram
Figure 104 (Sheet 3)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú

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A 737-300/400/500MAINTENANCE MANUAL

TIGHTEN THE NUT TO 55 |5 INCH-LBS
ASSEMBLED VIEW
Connector Assembly
Figure 105

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
737-300/400/500MAINTENANCE MANUAL
 WING AND LOWER AFT BODY OVERHEAT DETECTION SYSTEM -
___________________________________________________ MAINTENANCE PRACTICES
______________________
 1.  General_______
 A.  This section contains maintenance practices for the electronic Fenwal compartment overheat accessory unit. These practices are:
 (1)  
Local Test Procedure

 (2)  
Memory Read Procedure

 (3)  
Memory Clear Procedure

 (4)  
Alarm History Memory Read Procedure

 (5)  
Alarm History Memory Clear Procedure

 TASK 26-18-00-742-001
 2.  Built-in Test Procedures________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 26-18-11/501, Wing and Lower Aft Body Overheat Detection Sensing Element - Adjustment/Test

 B.  Access
 (1)  Location Zones
 205 Electronic Compartment
 101/102 Control Cabin

 C.  Procedure
 S 862-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-003

 (2)  
Close these circuit breakers on the P6 panel:

 (a)  
FIRE PROTECTION DETECTION OVHT WHL WELL WNG BDY

 (b)  
FIRE PROTECTION DETECTION MASTER WARN & CONTROL

 (c)  
MASTER CAUTION AIR COND

 D.  Local Test Procedure
 S 862-004
 (1)  Push the LOC TEST switch on the overheat accessory unit on the M237 compartment.
 (a)  The M237 LED display shows code 90 while you do the self-test.
 S 752-005
 (2)  If an alarm/fault condition is found, the display will show a fault code.
 (a)  Ref AMM 26-18-11/501 for fault codes and corresponding sensor locations.
　
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