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Invalid data _
_
HALF INTENSITY
CYAN
Invalid data
Invalid data
GEN Generator on
Generator off
with engine /
APU running
Both generator
and engine /
APU are off
IDG Constant
speed drive on
Low oil pressure
or high oil
temperature
Engine is off or
IDG has
disconnected
_ Engine / APU off
Engine / APU
running and
ready to load
_
APU
EICAS DIGITAL
READOUT GREEN AMBER WHITE
HALF INTENSITY
MAGENTA AMBER DASHES
XX KVA Generator
loaded
Generator
overload
Generator not
loaded
XXX V Voltage
100--125 VAC
Invalid data
XXX HZ Frequency Invalid data
375--425 Hz
Voltage not
in range
Frequency
not in range
Invalid data
_
_
UTIL BUS 2 Bus powered Invalid data
UTIL BUS 1 Bus powered Invalid data
SERV BUS Bus powered _
Bus inoperative
(AC service bus
fail)
Invalid data
ESS BUS Bus powered _ Invalid data
BUS 2 _ Invalid data
BUS 1
Bus powered
(generator line
contactor 1)
_ Invalid data
Bus powered
(generator line
contactor 2)
Bus not powered
(shed)
Bus not powered
(shed)
Bus inoperative
(essential bus
fail)
Bus not powered
Bus not powered
_
_
_
_
_
Flow Lines
Green -- Bus energized.
Blank -- Bus not energized.
REV 56, Jan 31/03
Vol. 1 07--20--6
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
AC Electrical System Synoptic Page
Figure 07---20---3 Sheet 2
EICAS DIGITAL
READOUT
EICAS
OUTLINE GREEN WHITE
ADG
GREEN WHITE AMBER DASHES
XXX V Between 108 and
130 volts Invalid data
XXX HZ Invalid data
Less than 108 volts or
more than 130 volts
ADG BUS
Between 360 and
440 Hz
ADG outline green
Voltage and frequency
digital readouts green
ADG outline white
Voltage or frequency
digital readouts white
Less than 360 Hz or
more than 440 Hz
SHED (white)
Indicates that the respective AC utility
bus has been automatically shed.
DISC (white)
Indicates that IDG has been disconnected.
AUTO XFER OFF (white)
Indicates that corresponding automatic
transfer has been selected off.
AUTO XFER FAIL (amber)
Indicates that corresponding automatic
transfer has failed.
ADG Features
Displayed when ADG voltage is more than 10 volts
and frequency is more than 300 Hz.
AC Electrical Page
Vol. 1 07--20--7
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 3
External AC Power Features
Displayed when external AC voltage is more
than 10 volts and frequency is more than 50 Hz.
EICAS
OUTLINE
GREEN WHITE HALF INTENSITY
MAGENTA
External AC available Invalid data
or in use
EICAS DIGITAL
READOUT GREEN AMBER WHITE HALF INTENSITY
MAGENTA
AMBER DASHES
XX KVA Loaded Overload Not loaded Insufficient data Invalid data
XXX V
Between 106
and 124 volts
_ Invalid data
XXX HZ Between 370 _ Invalid data
and 430 Hz
Less than 106 volts or
more than 124 volts
_
Less than 370 Hz or _
more than 430 Hz
External AC not available
and not in use
SERVICE CONFIGURATION (green)
The message is displayed:
When external AC power is available and the
AVAIL switchlight on the external service panel
has been selected, or
When APU power is available and the APU
SERV BUS switchlight on the forward F/A
panel has been selected.
For either selection, only the AC service bus, AC
utility bus 1, AC utility bus 2, and the DC service
bus will be powered.
AC Electrical Page
REV 56, Jan 31/03
Vol. 1 07--20--8
ELECTRICAL
AC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
AC Electrical System EICAS Indication (Generators) <MST
Figure 07---20---4
<0039> <0006>
IDG 1 or 2 caution (amber)
Indicates that IDG has low oil pressure
or high oil temperature.
GEN 1 or 2 OVLD caution (amber)
Indicates that generator control unit has
detected a load of greater than 40 kVA.
GEN 1 or 2 OFF caution (amber)
Indicates that generator is off.
(Indications are inhibited during start)
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