500  Left Wing-Body Overheat Troubleshooting Diagram 
May 01/99  Figure 101 (Sheet 2)  26-18-0 
Page 103 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Left Wing-Body Overheat Troubleshooting Diagram  500 
26-18-0  Figure 101 (Sheet 3)  May 01/99 
Page 104 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

DEFLECTOR LOOP  D742 PINS  LOOP CENTER CONDUCTOR RESISTANCE (75°F) 
AFT CARGO COMPARTMENT  13 TO 27  20 ohms max 
STRUT AND WING LEADING EDGE  4 TO 12  10 ohms max 
FORWARD AND AFT PACK  8 TO 2  10 ohms max 
FORWARD AND AFT KEEL BEAM  9 TO 29  10 ohms max 
TOTAL LEFT LOOP CENTER CONDUCTOR  50 ohms max 

NOTE: THE RESISTANCE MEASUREMENTS IN THIS TABLE INCLUDE CONNECTOR RESISTANCES.
LEFT LOOP CENTER CONDUCTOR RESISTANCE
(FOR AIRPLANES WITH BECO M237 COMPARTMENT OVERHEAT CONTROL UNIT)
TABLE A

500  Left Wing-Body Overheat Troubleshooting Diagram 
May 01/00  Figure 101 (Sheet 4)  26-18-0 
Page 105 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

A90561 A90562
Right Wing-Body Overheat Troubleshooting Diagram  500 
26-18-0  Figure 102 (Sheet 1)  May 01/99 
Page 106 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500 Right Wing-Body Overheat Troubleshooting Diagram May 01/99 Figure 102 (Sheet 2) 26-18-0 Page 106A/106B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

DEFLECTOR LOOP  D742 PINS  LOOP CENTER CONDUCTOR RESISTANCE (75°F) 
STRUT AND WING LEADING EDGE  10 TO 11  20 ohms max 

RIGHT LOOP CENTER CONDUCTOR RESISTANCE
(FOR AIRPLANES WITH BECO M237 COMPARTMENT OVERHEAT CONTROL UNIT)
TABLE B

NOTE: THE RESISTANCE MEASUREMENTS IN THIS TABLE INCLUDE CONNECTOR RESISTANCES.
F03718
500  Right Wing-Body Overheat Troubleshooting Diagram 
May 01/00  Figure 102 (Sheet 3)  26-18-0 
Page 107 
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A90564 A90566 A90568 A90571 A90573
Left Wing-Body Overheat Troubleshooting Diagram  500 
26-18-0  Figure 103 (Sheet 1)  May 01/99 
Page 108 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Left Wing-Body Overheat Troubleshooting Diagram 
May 01/99  Figure 103 (Sheet 2)  26-18-0 
Page 109 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Right Wing-Body Overheat Troubleshooting Diagram  500 
26-18-0  Figure 104 (Sheet 1)  May 01/99 
Page 110 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Right Wing-Body Overheat Troubleshooting Diagram 
May 01/99  Figure 104 (Sheet 2)  26-18-0 
Page 111 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 Connector Assembly  500 
26-18-0  Figure 105  Oct 20/92 
Page 112 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

WING AND LOWER AFT BODY OVERHEAT DETECTION SYSTEM -MAINTENANCE PRACTICES

EFFECTIVITY
Airplanes with Fenwal M237 Compartment Overheat Accessory Unit
1. General
A.  This section provides the operating procedures for the electronic Fenwal compartment overheat accessory unit.
B.  The following procedures are included in this section:
(1)  
Local Test Procedure

(2)  
Memory Read Procedure

(3)  
Memory Clear Procedure

(4)  
Alarm History Memory Read Procedure

(5)  
Alarm History Memory Clear Procedure

2.  Built-in Test Procedures
A.  Prepare for Procedure
(1)  
Provide electrical power (Ref 24-22-00 MP).

(2)  
Ensure the following circuit breakers on the P6 panel are closed:
　
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