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* AC standby bus
* DC standby bus
* Battery bus.
Standby Power Switch
The standby power switch gives you manual control of the AC
and DC standby power bus sources. The switch is a threeposition
switch. The switch is usually in the AUTO position. The
guard holds the switch in the AUTO position.
These buses have power when the standby power switch is in
the AUTO position and AC transfer bus 1 has power:
* AC standby bus
* DC standby bus
* Battery bus if the BAT switch is in the ON position.
These buses have power when the standby power switch is in
the AUTO position, the BAT switch is in the ON position, and AC
transfer bus 1 does not have power:
* AC standby bus
* DC standby bus
* Battery bus.
These are the conditions when the standby power switch is in
the OFF position and the BAT switch is in the ON position:
* STANDBY PWR OFF light is on
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* AC standby bus, static inverter, and the DC standby bus do
not have power
* Battery bus has power.
These buses have power when the BAT switch is in the ON or
the OFF position and the standby power switch is in the BAT
position:
* AC standby bus
* DC standby bus
* Battery bus
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General
The upper part of the AC systems, generator, and APU module
(P5-4) has these lights:
* GRD POWER AVAILABLE
* TRANSFER BUS OFF
* SOURCE OFF
* GEN OFF BUS
* APU GEN OFF BUS.
The upper part of the module also has these manual controls:
* Ground power switch
* Engine generator switches
* APU generator switches
* Bus transfer switch.
GROUND POWER AVAILABLE Light
The GRD POWER AVAILABLE light is on when external AC
power is connected and the quality is good. The light is bright
blue when on.
Ground Power Switch
You use the ground power switch to control external power to
the AC transfer buses. See electrical power - operation -
general description in this section for more information.
TRANSFER BUS OFF Light
The amber TRANSFER BUS OFF light comes on when the AC
transfer bus does not have power. There is one light for each
AC transfer bus.
SOURCE OFF Light
The amber SOURCE OFF light supplies indication that an AC
transfer bus is not energized by the selected source. The left
SOURCE OFF light is related to these sources:
* IDG 1 (GEN 1 switch)
* APU (left APU GEN switch)
* External power (ground power switch).
The right SOURCE OFF light is related to these sources:
* IDG 2 (GEN 2 switch)
* APU (right APU GEN switch)
* External power (ground power switch).
The SOURCE OFF light does not indicate that the AC transfer
bus is de-energized. In flight, the left SOURCE OFF light comes
on when GCB 1 trips. However, the bus transfer function lets
IDG 2 power AC transfer bus 1. These are the examples:
* IDG1 fails
* The bus transfer function closes the BTBs
* Both AC transfer buses get power from IDG2.
There is one light for each transfer bus.
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GEN OFF BUS Light
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