(a)  Make sure the APU BTL DISCH light on the squib circuit test box is on.

 (6)  
Make a record of the voltage shown on the multimeter (V1).

 (7)  
Set the toggle switch on the squib test box to ON.

 S 974-169
 S 864-170
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 974-171
 (8)  Make a record of the voltage shown on the multimeter (V2).
 (a)  For voltage V1 in the range shown, make sure that voltage V2 is greater than or equal to the value shown in the APU test voltage table
 ENGINE TEST VOLTAGES
 _____________V1 V2

 18.00
 - 19.00 9.67

 19.01
 - 20.00 10.18

 20.01
 - 21.00 10.69

 21.01
 - 22.00 11.20

 22.01
 - 23.00 11.71

 23.01
 - 24.00 12.22

 24.01
 - 25.00 12.73

 25.01
 - 26.00 13.23

 26.01
 - 27.00 13.74

 27.01
 - 28.00 14.25

 28.01
 - 29.00 14.76

 29.01
 - 30.00 15.27

 30.01
 - 31.00 15.78

 31.01
 - 32.00 16.29

 32.01
 - 33.00 16.80

 33.01
 - 34.00 17.31

 34.01
 - 35.00 17.82

 35.01
 - 36.00 18.32

 S 764-314
 (9)  
Set the toggle switch on the squib test box to OFF.

 S 864-172

 (10)
 Release the APU fire handle.

 (a)  Make sure the handle moves quickly to in 10 degrees or less of the center position.
 S 864-173
 (11)
 Turn the handle to the horizontal position.

 S 864-174

 (12)
 Turn and hold the APU fire handle fully clockwise.

 (a)  Make sure the APU BTL DISCH light on the squib circuit test box is on.
 S 974-175
 (13)
 Make a record of the voltage shown on the multimeter (V1).

 S 864-176

 (14)
 Set the toggle switch on the squib test box to ON.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 974-177
 (15) Make a record of the voltage shown on the multimeter (V2).
 (a)  For voltage V1 in the range shown, make sure that voltage V2 is greater than or equal to the value shown in the APU test voltage table
 S 864-178
 (16)
 Set the toggle switch on the squib test box to OFF.

 S 864-179

 (17)
 Release the APU fire handle.

 (a)  Make sure the handle moves quickly to in 10 degrees or less of the center position.
 S 864-180
 (18)
 Turn the handle to the horizontal position.

 S 864-181

 (19)
 Push in the fire handle to the usual position.

 S 864-182

 (20)
 Open this circuit breaker:

 (a)  P6 Main Power Distribution Panel
 1) 6H5 FIRE EXTINGUISHER APU

 S 484-183
 (21)
 Remove the squib electrical connector, DM103B, from the squib circuit test box.

 S 484-315

 (22)
 Connect connector DM103B to the APU fire bottle.

 NOTE: Do this procedure each time you connect an electrical
____
 connector to a fire bottle squib.

 (a)  Remove the protective cover from the fire bottle squib.
 WARNING: MAKE SURE THERE IS NO VOLTAGE AT THE ELECTRICAL CONNECTOR.
_______ IF THERE IS A VOLTAGE AT THE ELECTRICAL CONNECTOR, THE SQUIB CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
　
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