ELECTRICAL
AIRPLANE
OPERATIONS
MANUAL
2-05-05
Page
12
Code
01
REVISION 36
AOM-145/1114
AC SYSTEM
One 250 VA/400 Hz single phase static inverter converts 28 V DC
electrical power into 115 V AC for airplane systems requiring AC
power. The avionics system is the primary user of AC power.
The inverter is power supplied by the DC Bus 1 and controlled by the
AC Power Button, on the overhead panel. If DC Bus 1 is energized
and the AC Power Button is pressed, the 115 V AC BUS is
automatically energized. If the DC Bus 1 is deenergized, the inverter
becomes inoperative.
To reduce pilot workload, the AC Power Button should remain
pressed, even after engine shutdown. If the AC Power Button is
released, a striped bar illuminates to indicate that the button is out of
normal operating condition.
During normal airplane operation, if 115 V AC BUS is deenergized, a
caution message is displayed on the EICAS. An inverter reset may be
attempted through the AC Power Button, by releasing and then
pressing it again.
Under electrical emergency conditions the inverter stops the operation.
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