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generator or external AC. For normal AC distribution, AC power from IDG 1 and IDG 2
is distributed to all the AC buses via GCU controlled contactors in junction box 1 (JB1).
There is a priority control of AC power distribution. During normal operation, IDG 1
powers AC bus 1 and IDG 2 powers AC bus 2. The failure of a generator, for any
reason other than a fault on its associated bus, will automatically transfer the load from
the failed IDG to the remaining operative IDG. When the APU generator is available, it
can then be used to replace the failed IDG to power the respective AC bus. On the
ground, if the aircraft is being powered with external AC power and either the APU or
an IDG is brought on line, the external power will be automatically disconnected and the
respective APU or IDG generator will power all the AC buses. When external power is
not available, the APU generator provides electrical power to all the AC buses. If an
IDG is powering its respective AC bus and the APU generator is powering the other AC
bus, when the remaining IDG is brought on line the APU generator will be automatically
taken off line.
In service configuration, either external AC power or the APU generator is used to
power specific buses for general servicing of the aircraft on the ground. Only AC Utility
bus 1, AC Utility bus 2, the AC service bus and the DC service bus are powered.
IDG 1 APU GENERATOR IDG 2
Failed Not available Both AC Bus 1 and
AC Bus 2
Failed AC Bus 1 AC Bus 2
Both AC Bus 1 and
AC Bus 2 Not available Failed
AC Bus 1 AC Bus 2 Failed
Failed Both AC Bus 1 and
AC Bus 2 Failed
Vol. 1 07--20--3
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
AC System Distribution
Figure 07---20---1
RIGHT
ENGINE
LEFT
ENGINE
GCU GEN
1
APU
GEN GCU
AC ESS BUS
EXTERNAL
POWER
MONITOR
GCU
ADG
APU
EXTERNAL
AC
CSD
GCU GEN
2
CSD
ADG BUS
AC BUS 1
AC UTIL
BUS 1
AC BUS 2
AC SERV
BUS
AC UTIL
BUS 2
REV 56, Jan 31/03
Vol. 1 07--20--4
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
AC Electrical System
Figure 07---20---2
Electrical Power Panel
Overhead Panel
AUTO XFER
Used to disable automatic
transfer of associated IDG.
OFF (white) light indicates
autotransfer is selected off.
FAIL (amber) light indicates a
fault preventing autotransfer.
AC
Used to select external
AC power.
AVAIL (green) light
indicates external
power is connected
and is ready to use.
IN USE (white) light
indicates that the
external AC power unit
is supplying the
electrical system.
External Service Panel
Right Forward Fuselage
GEN 1, 2 and APU GEN
AUTO -- Connects
generator to
associated bus.
OFF/RESET --
Disconnects generator
from associated bus
and/or resets the
generator control
circuit.
EXT AC PUSH
Used to select
external AC power.
AVAIL (green) light
indicates external
power is connected
and is ready to use.
IN USE (white) light
indicates that the
external AC power
unit is supplying the
electrical system.
IDG 1 and 2 DISC
(Guarded)
Used to disconnect
IDG from engine.
DISC (white) light
indicates selected
disconnect is successful.
FAULT (amber) light
indicates a fault within
IDG (low oil pressure or
high oil temperature).
IDG will automatically
disconnect, when an
overtemperature or
overtorque condition
occurs.
Once disconnected, the
IDG cannot be reset with
the engines running.
AC ESS XFER
Used to switch essential bus feed
from AC bus 1 to AC bus 2.
ALTN (white) light indicates
essential bus is fed from AC bus 2.
Transfer is automatic during an AC
bus 1 failure.
ON
Vol. 1 07--20--5
REV 56, Jan 31/03
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
AC Electrical System Synoptic Page
Figure 07---20---3 Sheet 1
AC Electrical Page
Generator Load
Displays the load on
the generator.
Generator Voltage
Displays the generator
voltage level.
Generator Frequency
Displays the generator
frequency level.
EICAS
OUTLINE GREEN AMBER WHITE
HALF INTENSITY
MAGENTA
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