S 865-031

 (6)  
Open the fan cowl panels (Ref 71-11-02/201).

 S 865-032

 (7)  
Open the thrust reverser halves (Ref 78-31-00/201).

 E. Do a test of the fire detection elements.
 S 755-054
 CAUTION: MAKE SURE THE DETECTION ELEMENTS ARE OF THE SAME TYPE AS THE
_______ DETECTION SYSTEM IN THE AIRPLANE. THE ENGINE FIRE DETECTION SYSTEM WILL NOT OPERATE WHEN AN INCORRECT FIRE DETECTOR IS INSTALLED.
 (1)  Make sure (by a visual check) that the fire detection elements on the two engines are the same type as the detection system in the airplane.
 NOTE: Identification is found at one end of each detector
____
 support tube.

 (a)  Make sure that all three loop switches on the test box are in the NORMAL position.
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 S 865-039
 (2)  AIRPLANES WITH TERMINAL LUG CONNECTORS; Connect two C26002-4 cable assemblies to engine 1 as follows:
 (a)  
Connect the red alligator clip of one cable assembly to the A/1 (loop A) terminal lug of the upper fan detector.

 (b)  
Connect the black alligator clip to an airplane ground source.

 (c)  
Connect the red banana plug to the HI (red) jack of loop A on the test box.

 (d)  
Connect the black banana plug to the GND (black) jack of loop A on the test box.

 (e)  
Connect the red alligator clip of the second cable assembly to the B/2 (loop B) terminal lug of the upper fan detector.

 (f)  
Connect the black alligator clip to an airplane ground source.

 (g)  
Connect the red banana plug to the HI (red) jack of loop B on the test box.

 (h)  
Connect the black banana plug to the GND (black) jack of loop B on the test box.

 S 865-056
 (3)  AIRPLANES WITH ELECTRICAL CONNECTORS; Connect the C26002-22,-25 cable assemblies as follows:
 (a)  
Disconnect these electrical connectors:
 1) D2898 (Upper fan detector - loop A)
 2) D2902 (Upper fan detector - loop B)

 (b)  
Connect the electrical connector (red) of -22 cable assembly to the loop A upper fan detector.

 (c)  
Connect the alligator clip (black) to an airplane ground source.

 (d)  
Connect the red banana plug to the HI (red) jack of loop A on the test box.

 (e)  
Connect the black banana plug to the GND (black) jack of loop A on the test box.

 (f)  
Connect the electrical connector (red) of -25 cable assembly to the loop B upper fan detector.

 (g)  
Connect the alligator clip (black) to an airplane ground source.

 (h)  
Connect the red banana plug to the HI (red) jack of loop B on the test box.

 (i)  
Connect the black banana plug to the GND (black) jack of loop B on the test box.

 S 865-028
 (4)  Close these circuit breakers on the P6 panel:
 (a)  
FIRE PROTECTION DETECTION - ENG 1

 (b)  
MASTER WARNING AND CONTROL

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737-300/400/500MAINTENANCE MANUAL
 S 765-029
 (5)  Make sure these indications occur:
 (a)  
The INOP lights for engine 1 loop-A and loop-B on the M279 module are off.

 (b)  
The FAULT light on the P8-1 panel is on.

 NOTE: The FAULT light is on due to the FIRE PROTECTION
____ DETECTION - ENG 2 circuit breaker being open.
 S 865-057
 (6)  Slowly turn switches for loop A and loop B on the test box simultaneously to the FIRE position.
　
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