Left Wing Body Overheat Troubleshooting Diagram
Figure 101 (Sheet 4)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BECO M237 CONTROL UNIT ú
26-18-00
ú ú 01 Page 106 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A38377
A 737-300/400/500MAINTENANCE MANUAL
FAULT CODE FENWAL ALARM/ DETECTOR LOOP PINS D742 LOOP CENTER (75`F) CONDUCTOR RESISTANCE
34,32,30 24,22,20 14,12,10 40,42,44 CONDUCTOR TOTAL LEFT LOOP CENTER FORWARD AND AFT KEEL BEAM FORWARD AND AFT PACKSTRUT AND WING LEADING EDGE AFT CARGO COMPARTMENT 9 TO 29 8 TO 2 4 TO 12 13 TO 27 40,110 OHMS MAX 10,30 OHMS MAX5,20 OHMS MAX5,20 OHMS MAX 20,40 OHMS MAX 1 1 1 1 1
LEFT LOOP CENTER CONDUCTOR RESISTANCE TABLE A
____THE RESISTANCE MEASUREMENTS IN THIS TABLE INCLUDE CONNECTOR RESISTANCES.
NOTE:
AIRPLANES WITH SB 65-52808-26-01
Left Wing Body Overheat Troubleshooting Diagram
Figure 101 (Sheet 5)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A56005
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
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`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.
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`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 102 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BECO M237 CONTROL UNIT ú
26-18-00
ú ú 02 Page 108 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H55141
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.
DOES THE RIGHT WING BODY
OVERHEAT LIGHT, L33, COME ON?
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
22 REMOVE THE COMPARTMENT
OVERHEAT CONTROL UNIT FROM THE E3-2 SHELF IN THE E/E BAY.
MEASURE AND RECORD THE RESISTANCE BETWEEN PINS 10AND 11 OF THE D742 CONNECTOR.
SEE TABLE B FOR THE MAXI-MUM ACCEPTABLE RESISTANCE.
DOES THE RESISTANCE EXCEED THE MAXIMUM?
YES
NO
23 DISCONNECT AND CLEAN THE
CONNECTORS IN THE RIGHT STRUT
AND WING LEADING EDGE LOOP.
SEE FIG. 105 FOR PROPER CON-
NECTOR ASSEMBLY.
PUSH THE TEST SWITCH, S1, ON THE P5-10 PANEL.
DOES THE RIGHT WING BODY OVERHEAD LIGHT, L33, COME ON?
YES
44 THE SYSTEM IS OK.
42 REPLACE THE COMPARTMENT
OVERHEAT CONTROL UNIT, M237
(WDM 26-12-11).
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