26-18-00
 ú ú 02 Page 112 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H55146
A
737-300/400/500MAINTENANCE MANUAL
LEFT WING BODY OVERHEAT TROUBLE-SHOOTING DIAGRAM
NO NO

1 PUSH THE S1 OVHT TEST 21 PUSH THE LEFT WING BODY
SWITCH ON THE P5-10 PANEL. OVERHEAT LIGHT, L1, TO MAKE
SURE THE BULB OPERATES.

____CODE 92 WILL SHOW ONNOTE: DOES THE L1 LIGHT COME ON?

THE M237 OVERHEAT
CONTROL UNIT WHILE THE

YES TEST IS IN PROGRESS. NO
DOES THE LEFT WING BODY OVERHEAT LIGHT, L1, COME ON?
YES YES
SEE SHEET 3 YES
(BLOCK 2)  23 DO THE MEMORY READ PROCE-DURE (26-18-00/201) TO ISOLATE THE FAULTY LOOP OR CONTROLLER.
WERE ANY CONTROLLER FAULT CODES SHOWN?
NO
YES NO25 DISCONNECT AND CLEAN THE CONNECTORS OF THE LOOPS INDICATED BY THE FAULT CODES. SEE FIG. 105 FOR PROPER CON-NECTOR ASSEMBLY. DO THE MEMORY READ PROCEDURE.
WERE ANY DETECTOR LOOP FAULT CODES SHOWN?
YES

REPLACE DETECTOR ELEMENTS WITH HIGH RESISTANCE VALUES. IF THE PROBLEM CONTINUES, DO BLOCK 45.
Left Wing Body Overheat Troubleshooting Diagram
Figure 103 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A40045
FROM SHEET 2 (BLOCK 1) YES

2

DOES THE LEFT WING BODY OVERHEAT LIGHT, L1, STAY ON AFTER YOU RELEASE THE S1 OVHT TEST SWITCH?
NO
A 737-300/400/500MAINTENANCE MANUAL

45 THERE IS A LEAKY DUCT OR A DETECTION ELEMENT IS TOO CLOSE TO A HOT DUCT. TO ISOLATE THE ELEMENT THAT INITIATED THE ALARM, OPERATE THE PNEUMATIC SYSTEM AND USE THE TEST SWITCHES ON M237 TO IDENTIFY THE LOOP.
Left Wing Body Overheat Troubleshooting Diagram
Figure 103 (Sheet 3)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A40060
A 737-300/400/500MAINTENANCE MANUAL
PREREQUISITESMAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) EQUIPMENT:
(1)
MULTIMETER

 (2)
 WIRE END FITTING 35303-10, FENWAL INCORP., ASHLAND, MA

 (3)
 WIRE END FITTING 35303-11, FENWAL INCORP., ASHLAND, MA

_______ FOR SENSING ELEMENTS IN THE STRUT AREAS OR
CAUTION: THE WING LEADING EDGE; DO NOT USE A MULTIMETER ON THE SENSOR ELEMENTS IF THE ELEMENT'S TEMPERATURE IS ABOVE 210`F (99`C). IF THE TEMPERATURE IS BELOW 210`F (99`C) BUT ABOVE 70`F (21`C), LIMIT METER USE TO 5 SECOND APPLICATIONS WITH NO MORE THAN TWO APPLICATIONS PER MINUTE. IF THE TEMPERATURE IS BELOW 70`F (21`C), THE METER MAY BE USED WITHOUT RESTRICTION. IF THESE REQUIREMENTS ARE NOT FOLLOWED, DAMAGE TO THE SENSOR ELEMENT MAY OCCUR.
_______ FOR SENSING ELEMENTS NOT IN THE STRUT AREA
CAUTION: OR THE WING LEADING EDGE; DO NOT USE A MULTIMETER ON THE SENSOR ELEMENTS IF THE ELEMENT'S TEMPERATURE IS ABOVE 155`F (68`C). IF THE TEMPERATURE IS BELOW 155`F (68`C) BUT ABOVE 70`F (21`C), LIMIT METER USE TO 5 SECOND APPLICATIONS WITH NO MORE THAN TWO APPLICATIONS PER MINUTE. IF THE TEMPERATURE IS BELOW 70`F (21`C), THE METER MAY BE USED WITHOUT RESTRICTION. IF THESE REQUIREMENTS ARE NOT FOLLOWED, DAMAGE TO THE SENSOR ELEMENT MAY OCCUR.
Right Wing Body Overheat Troubleshooting Diagram
Figure 104 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú

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 ú ú 01 Page 115 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H55149
A 737-300/400/500MAINTENANCE MANUAL
RIGHT WING BODY OVERHEAT TROUBLE-SHOOTING DIAGRAM

NO
1
PUSH THE S1 OVHT TEST
SWITCH ON THE P5-10 PANEL.

NOTE:  CODE 92 WILL SHOW ON THE M237 OVERHEAT CONTROL UNIT WHILE THE TEST IS IN PROGRESS.
DOES THE RIGHT WING BODY OVERHEAT LIGHT, L33, COME ON?
　
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