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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 864-045
(25)
Set the GEN CONT 1, 2, 3, and 4 switches to ON.
S 214-046
(26)
Make sure the FIELD OFF lights on GEN FIELD MAN RESET switches 1, 2, 3, and 4 on the P461 panel are off.
S 864-047
(27)
Open these circuit breakers:
(a)
P180 DC Power Distribution Panel
1) 180B29 BCU-1 ALT
2) 180B30 BCU-2 ALT
S 864-048
(28)
Set the BATTERY switch to OFF.
S 214-049
(29)
Make sure the message BATTERY OFF shows on the upper EICAS screen.
S 864-050
(30)
Set the BATTERY switch to ON.
S 214-051
(31)
Make sure the message BATTERY OFF does not show on the upper EICAS screen.
S 864-052
(32)
Close these circuit breakers:
(a)
P180 DC Power Distribution Panel
1) 180B29 BCU-1 ALT
2) 180B30 BCU-2 ALT
S 864-053
(33)
Set the STANDBY POWER switch to OFF.
(34)
Make sure the upper EICAS screen is not on.
(35)
Set the STANDBY POWER switch to AUTO.
S 864-056
(36)
Get access to the maintenance page for the electrical system (AMM 45-10-00/201).
S 214-057
(37)
On the maintenance page for the electrical system, make sure the currents for the main and APU battery are 2 amps or less.
S 214-054
S 864-055
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-058
(38)
Set the STANDBY POWER switch to BAT.
S 214-059
(39)
On the maintenance page for the electrical system, make sure the currents for the main and APU battery are more than 2 amps.
S 864-060
(40)
Set the STANDBY POWER switch to AUTO.
S 864-061
(41)
Start the APU and let it operate for 90 seconds (Ref 49-11-00/201).
S 214-062
(42)
Make sure the FIELD OFF lights on the APU 1 and 2 switches on the P461 panel are off.
NOTE: If the FIELD OFF lights are on, move the APU 1 and 2 field
____
reset switches
S 214-064
(43)
Make sure that the AVAIL lights on the APU GEN 1 and 2 switches are on.
S 864-065
(44)
Set the APU GEN 1 and 2 switches to on.
S 214-066
(45)
Make sure that the ON lights on the APU GEN 1 and 2 switches are on.
(46)
Set the EXT PWR 1 and EXT PWR 2 switches to on.
(47)
Make sure that the ON lights on the EXT PWR 1 and 2 switches are on.
(48)
Stop the APU (AMM 49-11-00/201).
S 864-067
S 214-068
S 864-069
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747-400 MAINTENANCE MANUAL
S 864-075 CAUTION: THE ENGINES MUST NOT BE WINDMILING WHEN THE DISCONNECT SWITCHES
_______ ARE PRESSED. DAMAGE TO THE IDG COULD OCCUR.
(49) Push the DRIVE DISC 1, 2, 3, and 4 switches. NOTE: The engines do not need to run.____
S 214-071
(50) Make sure the messages DRIVE DISC 1, 2, 3, and 4 show on the upper EICAS screen.
S 864-076 CAUTION: THE ENGINES MUST NOT BE WINDMILLING WHEN THE IDG IS CONNECTED.
_______ DAMAGE TO THE IDG COULD OCCUR.
(51)
Engage the IDG on engines 1, 2, 3, and 4 (AMM 24-11-00/501). S 864-073
(52)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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