(a)
6H5, FIRE EXTINGUISHER APU
(b)
6L4, FLIGHT DECK LIGHT CAPT IND
F.
Do a Test of the Pressure Switch
S 865-022
(1)
At the bottle for the APU fire extinguisher, turn the hex key for the ground test clockwise and hold or push and hold the manual override switch (as required).
S 735-023
(2)
Make sure the APU BTL DISCH light on the fire control module, M7326 (P5), comes on.
S 735-025
(3)
Make sure the EICAS message BOTTLE LOW APU shows.
S 865-028
(4)
Release the hex key or the manual override switch on the bottle pressure switch (as required).
S 735-029
(5)
Make sure the APU BTL DISCH light goes off on the fire control module, M7326 (P5).
S 735-030
(6)
Make sure the EICAS message goes off.
G.
Do a Test of the Squib Discharge Circuit
S 865-135
(1)
Put the toggle switch on the squib circuit test box to the ON position.
(2)
Connect the multimeter to the squib circuit test box.
(3)
Measure and make a record of the load resistance value (RL).
S 485-033
(4)
Attach the adapter cable to the connector on the squib circuit test box.
S 485-136
S 975-137
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MAINTENANCE MANUAL
(5) S 865-034Put the toggle switch on the squib circuit test box to the OFF position.
(6) S 865-222Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag: (a) 6H5, FIRE EXTINGUISHER APU
(7) S 485-035Connect the squib electrical connector, DM103B, to the adapter cable on the squib circuit test box.
(8) S 865-224Remove the DO-NOT-CLOSE tag and close this circuit breaker on the main power distribution panel, P6: (a) 6H5, FIRE EXTINGUISHER APU
(9) S 485-036Connect the multimeter to the squib circuit test box.
S 865-037
(10) Pull the APU fire handle out to the EMERGENCY FIRE position on the fire control module, M7326 (P5).
NOTE: To operate the fire handle to the EMERGENCY FIRE position,
____ you must push the manual unlock button behind the handle. The handle must be held against the stops while you measure the voltages.
S 865-038
(11)
Turn and hold the APU fire handle fully counterclockwise.
S 735-039
(12)
Make sure the APU BTL DISCH light on the squib circuit test box is on.
S 975-040
(13)
Measure and make a record of the voltage on the multimeter (V1).
S 865-041
(14)
Put the toggle switch on the squib circuit test box to the ON position.
S 975-042
(15)
Make a record of the voltage on the multimeter (V2).
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747-400 MAINTENANCE MANUAL
S 865-043
(16) Release the APU fire handle.
(a) Make sure the handle moves quickly to in 10 degrees or less of the center position.
S 735-044
(17)
Make sure the multimeter shows 0 | 2 volts.
S 865-045
(18)
Turn the handle to the horizontal position.
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