(a)
Make sure that the ON lights are off.
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747-400 MAINTENANCE MANUAL
S 215-019
(11)
Make sure that the EICAS synoptic page shows:
(a)
The generator circuit breakers 1, 2, 3, and 4 are closed.
(b)
The auxiliary power breakers 1 and 2 are open.
(c)
The bus tie breakers 1, 2, 3, and 4 are closed.
(d)
The split system breaker is closed.
S 715-020
(12)
Push the BUS TIE 1, 2, 3, and 4 switches to ISLN.
S 215-021
(13)
Make sure that the ISLN lights on the BUS TIE 1, 2, 3, and 4 switches are on.
S 215-056
(14)
Make sure that these EICAS messages show on the main EICAS screen:
(a)
ELEC BUS 1 ISLN
(b)
ELEC BUS 2 ISLN
(c)
ELEC BUS 3 ISLN
(d)
ELEC BUS 4 ISLN
S 215-022
(15)
Make sure that the EICAS synoptic page shows:
(a)
The generator circuit breakers 1, 2, 3, and 4 are closed.
(b)
The bus tie breakers 1, 2, 3, and 4 are open.
(c)
The split system breaker is closed.
S 715-023
(16)
Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.
S 215-053
(17)
Make sure that the ISLN lights on the BUS TIE 1, 2, 3, and 4 switches go out.
S 215-054
(18)
Make sure that these EICAS messages do not show on the main EICAS screen:
(a)
ELEC BUS 1 ISLN
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747-400 MAINTENANCE MANUAL
(b)
ELEC BUS 2 ISLN
(c)
ELEC BUS 3 ISLN
(d)
ELEC BUS 4 ISLN
S 215-023
(19)
Make sure that the AVAIL lights on EXT PWR 1 and EXT PWR 2 are on.
S 715-024
(20)
Push the EXT PWR 1 and EXT PWR 2 switches.
S 215-064
(21)
Make sure that the ON lights on the EXT PWR 1 and EXT PWR 2 switches go on in 4 seconds.
NOTE: The change from IDG power to external power must not
____ cause an interruption in the power service that you can see.
S 215-025
(22)
Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches are on.
S 215-055
(23)
Make sure that these EICAS messages show on the main EICAS screen:
(a)
ELEC GEN OFF 1
(b)
ELEC GEN OFF 2
(c)
ELEC GEN OFF 3
(d)
ELEC GEN OFF 4
S 215-026
(24)
Make sure that the EICAS synoptic page shows:
(a)
The external power contactors 1 and 2 are closed.
(b)
The generator circuit breakers 1, 2, 3, and 4 are open.
(c)
The bus tie breakers 1, 2, 3, and 4 are closed.
(d)
The split system breaker is open.
(25)
Push the GEN CONT 1 and GEN CONT 4 two times to the ON position.
S 715-027
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747-400 MAINTENANCE MANUAL
S 215-028
(26) Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches are off.
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