(a)
ELEC GEN OFF 1
(b)
ELEC GEN OFF 2
(c)
ELEC GEN OFF 3
(d)
ELEC GEN OFF 4
S 215-029
(28)
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 closed.
(c)
The split system breaker is closed.
S 865-039
(29) Apply airplane loads to the ac and dc buses.
NOTE: Airplane loads include galley ovens, window heat,
____
compartment heat, and water heaters.
S 715-040
(30)
Get access to the electrical maintenance page through the CMC (AMM 45-10-00/201).
S 215-060
(31)
Make sure that the IDG 1, 2, 3, and 4 show these values:
(a)
115 | 5 volts ac
(b)
400 | 5 Hz frequency
(c)
The IDGs show equal loads.
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MAINTENANCE MANUAL
S 215-041
(32)
Make sure that the AVAIL lights on APU GEN 1 and APU GEN 2 switches are on.
S 715-042
(33)
Push the APU GEN 1 and APU GEN 2 switches to ON.
S 215-043
(34)
Make sure that the ON lights on APU GEN 1 and APU GEN 2 switches come on in 4 seconds.
NOTE: The change from IDG power to APU power must not cause an
____
interruption in the power service that you can see.
S 215-044
(35)
Make sure that the OFF lights on GEN CONT 1, 2, 3, and 4 switches are on.
S 215-045
(36)
Make sure that the electrical maintenance page for the APU generators 1 and 2 show:
(a)
115 | 5 volts ac
(b)
400 | 5Hz frequency
(c)
The two APU generators show an electrical load.
S 865-046
(37)
Remove the airplane loads from the ac and dc buses.
S 215-050
(38)
Make sure that the AVAIL lights on EXT PWR 1 and EXT PWR 2 switches are on.
S 715-051
(39)
Push the EXT PWR 1 and EXT PWR 2 switches to ON.
S 215-063
(40)
Make sure that the ON lights on the EXT PWR 1 and 2 switches come on in 4 seconds.
NOTE: The change from APU power to external power must not
____ cause an interruption in the power service that you can see.
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747-400 MAINTENANCE MANUAL
S 215-052
(41)
Make sure that the AVAIL lights on APU GEN 1 and APU GEN 2 are on.
(a)
Make sure that the ON lights are off.
E.
Put the Airplane back to the Usual Condition.
S 865-053
(1)
Stop the engines (AMM 71-00-00/201).
S 865-054
(2)
Stop the APU (AMM 49-11-00/201).
S 865-055
(3)
Remove the electrical power from the airplane, if it is not necessary (AMM 24-22-00/201).
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2.
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