B.
The task also has an operational test of the dc distribution to the APU static inverter. This operational test will do a test of these remote control circuit breakers:
(1)
C10412, APU INVERTER POWER/APU BATTERY
(2)
C10416, APU INVERTER TRANSFER RELAY POWER
TASK 24-60-00-715-001
2. Operational Test - DC Electrical Load Distribution__________________________________________________
A. General
(1)
Most of the lights and switches you must use are on the P5 overhead panel. Other panels you must use are identified in the task.
B.
Standard Tools and Equipment
(1)
Multimeter - Fluke 77, John Fluke Mfg. Co., Inc.
P.O. Box C9090, Everett, WA 98206 (or equivalent)
C.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 45-10-00/201, Central Maintenance Computer System
(3)
WDM 24-31-21, WDM 24-32-12, WDM 24-33-11, WDM 24-33-12, WDM 24-33-31
(4)
SSM 24-32-01, SSM 24-33-01, SSM 24-33-02, SSM 24-33-03
D.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH 221 Control Cabin, LH 222 Control Cabin, RH
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MAINTENANCE MANUAL
(2) Access Panel
P6, Main Power Distribution Panel
E. Prepare for Tests
S 865-002
CAUTION:_______DO NOT OPERATE THE APU DURING THIS TASK. TRANSIENTS CAN CAUSE THE APU TO SHUT DOWN. AN APU SHUT OFF CAN CAUSE DAMAGE TO THE PACKS AND THE APU.
(1) Apply external power to the airplane (AMM 24-22-00/201).
NOTE: If you use only one external power cable, the SSB can
____ open during these procedures. IF this occurs, push the SPLIT SYSTEM BREAKER switch on the GEN FIELD MAN RESET panel to close the SSB.
S 715-013
(2)
Do a test of the indicator lights for the electrical system.
(a)
Push the IND LTS switch, on the P5 overhead panel, to TEST.
(b)
Make sure that all of the indicator lights for the electrical system are on.
NOTE: The indicator lights are on the P5 overhead panel
____ and the P461 overhead maintenance panel.
(c) Set the IND LTS switch to BRT.
S 865-006
(3)
Make sure that the BUS TIE 1, 2, 3, and 4 ISLN lights are off.
(a)
If an ISLN light is on, push the applicable ISLN BUS TIE switch.
(4)
Set the STORM switch to OFF.
S 865-007
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747-400 MAINTENANCE MANUAL
(5) S 865-008Open this circuit breaker to remove the ground service bus power from the flight compartment dome lights: (a) P6, Main Power Distribution Panel 1) 6F24, FLT DK LIGHTS DOME
(6) S 715-009Make sure that the flight compartment dome lights are on.
(7) S 865-010Set the IRS L, C, and R mode select switches to OFF.
(8) S 865-011Set the GND TESTS switch, on the P461 overhead maintenance panel, to NORM.
S 865-012
WARNING: OPEN THE APPLICABLE ENGINE IGNITION CIRCUIT BREAKERS BEFORE YOU
_______ DO THESE PROCEDURES. IF YOU DO NOT OPEN THE BREAKERS, THE IGNITER PLUGS CAN AUTOMATICALLY FIRE. FUEL IN THE COMBUSTION CHAMBER CAN CAUSE AN ENGINE FIRE. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE ENGINE.
(9)
For the applicable engine, open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6, Main Power Distribution Panel 1) 6F1, IGN 1 ENG 1 2) 6K19, IGN 2 ENG 1 3) 6G19, STBY IGN ENG 1 4) 6F2, IGN 1 ENG 2 5) 6K20, IGN 2 ENG 2 6) 6G20, STBY IGN ENG 2 7) 6F3, IGN 1 ENG 3
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