A59882
Right Wing Body Overheat Troubleshooting Diagram
Figure 102 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BECO M237 CONTROL UNIT ú
26-18-00
ú ú 02 Page 109 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FROM SHEET 2 (BLOCK 1) YES
2
DOES THE RIGHT WING BODY OVERHEAT LIGHT, L33, STAY ON AFTER YOU RELEASE THE S1 OVHT TEST SWITCH?
A 737-300/400/500MAINTENANCE MANUAL
YES 24 DID THE RIGHT WING BODY OVERHEAT LIGHT, L33, GO OFF WHEN THE ENGINE AND/OR APU BLEED VALVES CLOSED? YES 45 THERE IS A LEAKY DUCT OR A DETECTION ELEMENT IS TOO CLOSE TO A HOT DUCT. TO ISO-LATE THE ELEMENT THAT INITI-
ATED THE ALARM, OPERATE THE PNEUMATIC SYSTEM IN THE CON-FIGURATION THE ALARM OCCURRED AND USE THE TEST SWITCHES ON M237 TO IDENTIFY LOOP.
NO NO
YES
25 REMOVE THE COMPARTMENTOVERHEAT CONTROL UNIT, M237, ON THE E3-2 SHELF IN THE E/E BAY.
MEASURE THE RESISTANCES
FROM PIN 10 TO GROUND AND FROM
IS THERE CONTINUITY? NO
46 THERE IS A SHORT CIRCUIT
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 CON-
NECTOR NUMBERS. TEST FOR CON-
TINUITY BETWEEN EACH DETEC-
TOR'S CENTER CONDUCTOR AND
GROUND TO ISOLATE THE SHORT
CIRCUIT.
REPLACE THE BAD SENSOR ELEMENT.
A38381
Right Wing Body Overheat Troubleshooting Diagram
Figure 102 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH BECO M237 CONTROL UNIT ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
LOOP DETECTOR D742 PINS CONDUCTOR RESISTANCE (75`F) LOOP CENTER
STRUT AND WING LEADING EDGE 10 TO 11 10 OHM MAX 20 OHM MAX 1
RIGHT LOOP CENTER CONDUCTOR RESISTANCE TABLE B
____THE RESISTANCE MEASUREMENTS IN THIS TABLE INCLUDE CONNECTOR RESISTANCES.
NOTE:
AIRPLANES WITH SB 65-52808-26-01
Right Wing Body Overheat Troubleshooting Diagram
Figure 102 (Sheet 4)
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E84141
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 103 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 CONTROL UNIT ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 防火 FIRE PROTECTION(72)
