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Electrical System.
CB TRIP AC FEED
Indicates that a circuit
breaker for an AC
feeder/AC cabin feeder
has tripped.
RAT GEN FAIL (on ground only)
Indicates that a fault has been
detected in the RAT generator
system.
AC ESS BUS FAIL
Indicates that AC ESS
is not powered or has
a fault.
EMER PWR ONLY
Indicates that RAT is
powering the AC ESS BUS or the
batteriy is powering the BATT BUS.
AC BUS 1−2−3−4 FAIL
Indicates that affected
bus is not powered or
has a fault.
APU GEN OVLD
Indicates an overload
on the APU generator.
GEN 1−2−3−4 OVLD
Indicates an overload
on affected generator
channel. CB TRIP DC FEED
Indicates that a circuit
breaker for a DC feeder/DC
cabin feeder has tripped.
APU GEN OVERHEAT
Indicates that the APU
generator oil has
overheated.
GF0710_016
EMER PWR ONLY
AC BUS 1 FAIL
AC BUS 2 FAIL
AC BUS 3 FAIL
AC BUS 4 FAIL
AC ESS BUS FAIL
APU GEN OVERHEAT
APU GEN OVLD
CB TRIP AC FEED
CB TRIP DC FEED
GEN 1 OVLD
GEN 2 OVLD
GEN 3 OVLD
GEN 4 OVLD
RAT GEN FAIL
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−16
AC SYSTEM EICAS MESSAGES (CONT'D)
Effectivity:
· Airplanes 9002 thru 9122 not incorporating Service Bulletin:
· SB 700−24−045, AC and DC Power Distribution − Unit Change and Activation of Build 4
Electrical System.
CB TRIP
Indicates that a circuit
breaker has tripped.
AC BUS 1 (2, 3, 4) MAN OFF
Indicates that the affected
bus has been manually
isolated. All 4 busses cannot
be manually isolated
concurrently.
GEN 1−2−3−4 OFF
Indicates that affected
generator is selected off.
EXT AC PWR ON
Indicates that external
AC power has been
selected on.
ELEC SYS FAULT
(on ground only)
Indicates that a minor
fault has been detected
in the electrical system.
APU GEN FAIL
Indicates that APU
GEN has failed.
EXT AC PWR AVAIL
Indicates that external
power is available.
GEN 1−2−3−4 FAIL
Indicates a GCU fault in
the applicable generator
APU GEN OFF
Indicates that
APU GEN is selected off.
RAT GEN ON
Indicates that the RAT
generator is powering
the AC ESS BUS.
RAT GEN OFF
Indicate that the RAT is
deployed and the RAT
generator is not powering the
AC ESS BUS.
GF0710_017
APU GEN FAIL
ELEC SYS FAULT
EXT AC PWR AVAIL
CB TRIP
GEN 1 FAIL
GEN 2 FAIL
GEN 3 FAIL
GEN 4 FAIL
RAT GEN ON
AC BUS 1 MAN OFF
AC BUS 2 MAN OFF
AC BUS 3 MAN OFF
AC BUS 4 MAN OFF
APU GEN OFF
EXT AC PWR ON
GEN 1 OFF
GEN 2 OFF
GEN 3 OFF
GEN 4 OFF
RAT GEN OFF
AC BUS1 XFER FAULT
AC BUS2 XFER FAULT
AC BUS3 XFER FAULT
AC BUS4 XFER FAULT
AC BUS 1−2−3−4 XFER FAULT
Indicates that transfer of
alternate power supply to
affected AC bus is lost.
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−17
AC SYSTEM SYNOPTIC
Electrical system warnings, cautions advisories and status messages are presented on the EICAS
primary display. General views of airplane electrical systems (either AC or DC) are presented
through synoptic diagrams on the EICAS secondary display (after selecting the appropriate key on
the EICAS control panel).
Generator Output
Flow Line (Lower)
Green − Generator is on.
Blank − Generator is off.
Generator Output
Flow Line (Upper)
· Green − Generator
line contactor at generator position.
· Blank − Generator
line contactor at tie position.
Generator Voltage
Readout
Displays, in VAC, the
generator voltage level.
· Green − 100−125 VAC
· Amber − GCU fault
· White − GEN off
· Magenta − Invalid data.
Generator Load
Readout
Displays in KVA, the load
on the generator.
APU Generator
Frequency Readout
Displays, in Hz, the
generator frequency level.
EICAS Control Panel
GF0710_018
AC BUS 1
V
KVA
115
12
GEN
1
GEN
2
AC BUS 2
V
KVA
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