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 (a)  Make sure the two test lamps do not come on. or do a check for less than 1 vdc on the two multimeters.
 S 865-126
 (21) Turn the fire handle for engine 2 fully clockwise and hold it in its position.
 (a)  Make sure the two test lamps come on. or do a check for more than 16 vdc on the two multimeters.
 S 865-127
 (22) Release the fire handle for engine 2.
 (a)  Make sure the two test lamps are off. or do a check for less than 1 vdc on the two multimeters.
 S 865-128
 (23)
 Disconnect the two test lamps or multimeters from connector D1324.

 S 865-129

 (24)
 Put the fire switch handle for engine 2 back to the correctly closed position.

 S 865-130

 (25)
 Connect a 28 volt DC test lamp or multimeter to pins 1 and 2 of connector D594, APU squib connector.

 (a)  Make sure the test lamp does not come on. or do a check for less than 1 vdc on the multimeter.
 S 865-131
 (26)
 Push the override button behind the fire switch handle for the APU and pull the handle.

 S 865-132

 (27)
 Turn the APU fire handle fully counterclockwise and hold it in its position.

 (a)  Make sure the test lamp comes on. or do a check for more than 16 vdc on the multimeter.
 S 865-133
 (28) Release the fire handle for the APU.
 (a)  Make sure the test lamp is off. or do a check for less than 1 vdc on the multimeter.
 S 865-134
 (29) Turn the APU fire handle fully clockwise and hold it in its position.
 (a)  Make sure the test lamp comes on. or do a check for more than 16 vdc on the multimeter.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-135
 (30) Release the fire handle for the APU.
 (a)  Make sure the test lamp goes off. or do a check for less than 1 vdc on the multimeter.
 S 865-136
 (31)
 Disconnect the test lamp or multimeter from connector D594.

 S 865-137

 (32)
 Put the fire switch handle for the APU back to the correctly closed position.

 J. Connect and do a check of the bottle squib connections.
 S 865-138
 (1)
Open the EXTINGUISHER BOTTLE APU circuit breaker on the P6-2 panel.

 S 865-139

 (2)  
Remove the shunt plug from the APU squib.

 S 865-140

 (3)  
Connect connector D594 to the squib on the APU bottle.

 S 865-141

 (4)
Close the EXTINGUISHER BOTTLE APU circuit breaker on the P6-2 panel.

 (a)  Make sure these circuit breakers on the p6-2 panel are closed: 1) EXTINGUISHER BOTTLES RIGHT 2) EXTINGUISHER BOTTLES LEFT 3) EXTINGUISHER BOTTLE RIGHT 4) EXTINGUISHER BOTTLE LEFT
 S 865-142
 (5)  Move the EXT TEST switch on the P8-1 panel to 1 and hold it.
 (a)  Make sure that only the APU (green) light on the P8-1 comes on.
 S 865-143
 (6)  Move the EXT TEST switch on the P8-1 panel to 2 and hold it.
 (a)  Make sure that only the APU (green) light on the P8-1 comes on.
 S 865-144
 (7)  Open these circuit breakers on the P6-2 panel:
 (a)  
EXTINGUISHER BOTTLES RIGHT

 (b)  
EXTINGUISHER BOTTLES LEFT

 (c)  
EXTINGUISHER BOTTLE RIGHT

 (d)  
EXTINGUISHER BOTTLE LEFT

 S 865-146
 (8)  Remove the shunt plugs from these engine squibs:
 (a)  
Squib 1 (forward) on the L (forward) fire extinguisher bottle

 (b)  
Squib 2 (aft) on the R (aft) fire extinguisher bottle

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 WARNING:_______ DO NOT INSTALL AIRPLANE ELECTRICAL CONNECTOR TO THE SQUIB WITH VOLTAGE AT THE PINS OF THE CONNECTOR. ACCIDENTAL DISCHARGE OF THE SQUIB CAN CAUSE INJURY TO PERSONS.
　
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