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____ DETECTION - ENG 1 circuit breaker being open.
 S 865-158
 (6)  Slowly turn the knobs for loop A and loop B on the test box simultaneously to the fire position.
 (a)  
Make sure that these lights on the P8-1 panel come on. 1) All of the lights in the engine 2 fire switch. 2) The ENG 2 OVERHEAT light.

 (b)  
Make sure all these lights on the P7 panel come on. 1) AIRPLANES WITH OTHER THAN -98 FIRE DETECTION UNIT;

 the two FIRE WARN lights.
 2) The MASTER CAUTION lights.
 3) The OVHT/DET annunciator.

 (c)  
AIRPLANES WITH OTHER THAN -98 FIRE DETECTION UNIT;
 the alarm bell in the control cabin operates.

 

 S 865-159
 CAUTION: DO NOT TURN THE FIRE SWITCH WHILE IT IS IN THE OUT POSITION.
_______ THE CONTENTS OF THE FIRE BOTTLE WILL BE LET OUT.
 (7)  Pull the engine 2 fire switch up.
 NOTE: The switch must be free to move up without the use of the
____
 override button.

 S 865-161
 (8)  
Push in the engine 2 fire switch to close.

 S 865-162

 (9)  
Turn the knobs for loop A and loop B on the test box back to the NORMAL position.

 (a)  Make sure these lights on the P8-1 panel go off.
 1) The lights in the engine 2 fire swtich.
 2) The ENG 2 OVERHEAT light.

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737-300/400/500MAINTENANCE MANUAL
 (b)  
Make sure all these lights on the P7 panel go off. 1) AIRPLANES WITH OTHER THAN -98 FIRE DETECTION UNIT;

 the two FIRE WARN lights.
 2) The MASTER CAUTION lights.
 3) The OVHT/DET annunciator.

 (c)  
AIRPLANES WITH OTHER THAN -98 FIRE DETECTION UNIT;
 the alarm bell in the control cabin makes no sound

 

 S 865-166
 (10) Close this circuit breaker on the P6 panel:
 (a)  FIRE PROTECTION DETECTION - ENG 1
 S 865-167
 (11)
 The FAULT light on the P8-1 panel goes off.

 S 865-160

 (12)
 Move the switch for loop A on the test box to the GND FAULT position.

 (a)  Make sure the ENGINE 2 INOP-LOOP A light on the M279 module at the E3-3 shelf comes on.
 S 865-163
 (13) Move the switch for loop B on the test box to the GND FAULT position.
 (a)  Make sure these indications occur: 1) The ENGINE 2 INOP-LOOP B light on the M279 module comes on. 2) The FAULT light on the P8-1 panel comes on.
 S 865-075
 (14) Move the switches for loop A and loop B on the test box back to the NORMAL position.
 (a)  Make sure these indications occur: 1) The ENGINE 2 INOP-LOOP A light on the M279 module is off. 2) The ENGINE 2 INOP-LOOP B light on the M279 module is off. 3) The FAULT light on the P8-1 panel is off.
 S 865-164
 (15)
 Open these circuit breakers on the P6 panel:

 (a)  
FIRE PROTECTION DETECTION _ ENG 1

 (b)  
FIRE PROTECTION DETECTION - ENG 2

 (c)  
MASTER WARNING AND CONTROL

 

 (16)
 Disconnect the test box from the airplane.

 S 425-078

 (17)
 AIRPLANES WITH ELECTRICAL CONNECTORS; Connect these electrical connectors:

 (a)  
D2898 (Upper fan detector - loop A)

 (b)  
D2902 (Upper fan detector - loop B)

 

 S 085-077
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A
737-300/400/500MAINTENANCE MANUAL
 H.  Measure the electrical continuity from the fire detection elements to the airplane ground on engine 2.
 S 485-079
 (1)  Connect the multimeter between the outer shell of the upper fan detector element and the airplane ground.
 (a)  Make sure the resistance is less than 1 ohm.
　
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