(a)
Set the IND LTS switch, found on the P5 overhead panel, to TEST.
(b)
Make sure that all the indicator lights, on the P5 and P461 overhead panels, for the electrical system are ON
NOTE: Most of the switches and lights you must use are on
____ the P5 overhead panel. Other panel names are identified when they are necessary.
(c) Set the IND LTS switch to BRT.
S 865-006
(3)
Make sure that the L and R UTILITY switches are ON.
(a)
Make sure that the OFF lights go out.
S 865-056
(4)
Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.
(a)
Make sure that the ISLN lights are off.
S 865-008
(5)
Set the GEN CONT 1, 2, 3, and 4 switches to ON.
(a)
Make sure that the OFF lights are on.
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747-400 MAINTENANCE MANUAL
S 865-010
(6)
Make sure that the DRIVE lights for the DRIVE DISC 1, 2, 3, and 4 switches are on.
S 865-009
(7)
Make sure that the FIELD OFF lights for the APU generators 1 and 2, on the P461 overhead maintenance panel, are off.
(a)
If the FIELD OFF lights are on, operate APU 1 and(or) 2 field switches to turn off the lights.
S 865-060
(8)
Set the GND TESTS switch, on the P461 overhead maintenance panel, to NORM.
S 865-061
(9)
Make sure that the BATTERY switch is ON.
S 865-062
(10)
Set the STANDBY POWER switch to AUTO.
D.
Do the Operational Test
S 865-011
(1)
Start the APU and let it operate for 90 seconds (AMM 49-11-00/201).
S 215-012
(2)
Make sure that the AVAIL lights on APU GEN 1 and APU GEN 2 switches are on.
(3)
Push the APU GEN 1 and APU GEN 2 switches.
S 215-062
(4)
Make sure that the ON lights on APU GEN 1 and APU GEN 2 switches come on in 4 seconds.
S 715-013
NOTE: The change from external power to APU power must not
____ cause an interruption in the power service that you can see.
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747-400
MAINTENANCE MANUAL
S 215-014
(5) Make sure that the AVAIL lights on the EXT PWR 1 and EXT PWR 2 switches are on.
(a) Make sure that the ON lights are off.
S 215-015
(6) Push the ELEC switch on the EICAS display select panel, found on the P10 autoflight control panel.
S 215-061
(7) Look at the electrical system synoptic page and make sure that the breakers are positioned as shown: (a) The auxiliary power breakers 1 and 2 are closed. (b) The external power contactor 1 and 2 are open. (c) The bus tie breakers 1, 2, 3, and 4 are closed. (d) The split system breaker is open.
S 865-016
CAUTION: THE DRIVE LIGHT IN THE DRIVE DISC SWITCH MUST GO OUT AFTER THE
_______ ENGINE STARTS. IF THE DRIVE LIGHT STAYS ON, OR COMES ON AFTER THE ENGINE STARTS, PUSH THE DRIVE DISC SWITCH. THIS REMOVES INPUT POWER TO THE IDG. HIGH OIL TEMPERATURE OR LOW OIL PRESSURE CAN CAUSE DAMAGE TO THE IDG.
(8)
Start the engines (AMM 71-00-00/201).
S 215-017
(9)
Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches go out as the engines near idle speed.
NOTE: The change from APU power to IDG power must not cause an
____ interruption in the power service that you can see.
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