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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PREREQUISITES MAKE 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.
Left Wing Body Overheat Troubleshooting Diagram
Figure 101 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BECO M237 CONTROL UNIT ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A38321
A

737-300/400/500
MAINTENANCE MANUAL 
LEFT WING BODY 
OVERHEAT TROUBLE-
SHOOTING DIAGRAM 

 

TABLE A. SEE FIG. 105 FORPROPER CONNECTOR ASSEMBLY. PUSH THE TEST SWITCH, S1, ON THE P5-10 PANEL.
 DOES THE LEFT WING BODY OVERHEAT LIGHT, L1, COME ON?

Left Wing Body Overheat Troubleshooting Diagram
Figure 101 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H55133
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 2
(BLOCK 1)
YES YES YES

2 DOES THE LEFT WING BODY
24 DID THE LEFT WING BODY 45 THERE IS A LEAKY DUCT OR A OVERHEAT LIGHT, L1, STAY ON OVERHEAT LIGHT, L1, GO OFF DETECTION ELEMENT IS TOO CLOSE AFTER YOU RELEASE THE S1 OVHT WHEN THE ENGINE AND/OR APU TO A HOT DUCT. TO ISOLATE THE TEST SWITCH? BLEED VALVES CLOSED? ELEMENT THAT INITIATED THE

ALARM, OPERATE THE PNEUMATIC
NO
NO
SYSTEM IN THE CONFIGURATION THE ALARM OCCURRED AND USE TEST SWITCHES ON M237 TO IDENTIFY LOOP.
YES

25 HOLD THE TEST SWITCH, S3,
46 THERE IS A SHORT CIRCUIT ON THE COMPARTMENT OVERHEATFROM THE CENTER CONDUCTOR OF CONTROL UNIT, UP. THE DETECTION ELEMENT TO
DOES THE OVHT LIGHT, DS1, GROUND IN THE AFT LOOP ON M237, COME ON? BETWEEN PINS 27 AND 13 OF THE D742 CONNECTOR. SEE ELECTRI-
NO
CAL SCHEMATIC 26-10-05 FOR DETECTOR ELEMENT AND CONNECTOR NUMBERS. TEST FOR CONTINUITY BETWEEN EACH DETECTOR'S CENTER CONDUCTOR AND GROUND TO ISO-LATE THE SHORT CIRCUIT.
YES

26 HOLD THE TEST SWITCH, S2,
47 THERE IS A SHORT CIRCUIT
UP. FROM THE CENTER CONDUCTOR OF
DOES THE OVHT LIGHT, DS1, THE DETECTION ELEMENT TO
ON M237, COME ON? GROUND IN THE KEEL BEAM LOOP

BETWEEN PINS 9 AND 29 OF THE
NO
D742 CONNECTOR. SEE ELECTRI-CAL SCHEMATIC 26-10-05 FOR SEE SHEET 4
DETECTOR ELEMENT AND CONNECTOR (BLOCK 27)
NUMBERS. TEST FOR CONTINUITY BETWEEN EACH DETECTOR'S CENTER CONDUCTOR AND GROUND TO ISOLATE THE SHORT CIRCUIT.
Left Wing Body Overheat Troubleshooting Diagram
Figure 101 (Sheet 3)

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