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0.0 V R BATT
GEN
HYD
L ESS BUS
L MAIN BUS
R ESS BUS
R MAIN BUS
BUS TIE
20 A 0 A 30 A
28.5 V 28.0 V
GEN GEN GEN
0.0 V
APU
L AUX BUS R AUX BUS
ELEC
1200
AUTO PLAN
SHLDR SIDE
PWR
EXT
24.1V
DN
FLAPS 0 GEAR
DN DN
REV 1
ELECTRICAL
Volume 2 Flight Crew Operating Manual Sep 14/2005
07-01-18 CSP 100-6 REV 4
EICAS MESSAGES
The electrical system messages are shown on the EICAS. In the table below is a list of the electrical system messages,
inhibits, and aural warnings. A brief explanation of each message is provided.
MESSAGE INHIBITS MEANING
AURAL
WARNING
L (R)
BATT OVERHEAT TO/LAND
Respective battery internal temperature
exceeded 70 °C
ESSENTIAL POWER
ONLY
The essential buses are powered by the batteries
only. AUX and MAIN buses are automatically
deactivated in flight
APU GEN FAIL TO/LAND The APU generator failed
APU GEN OVERLOAD TO/LAND The APU generator has exceeded 500 amp
L (R) BATT FAIL
TO/LAND
Either the respective battery contactor failed or
the battery has been automatically disconnected
for overheat protection
ELEC HYD GEN FAIL TO/LAND
The hydraulic generator has failed to come online
ELECTRICAL FAULT TO/LAND
An electrical system failure has occurred that
prevents display of electrical indications
L (R) GEN FAIL
TO/LAND
The affected generator has failed. If the APU
generators not on line, the BUS-TIE will automatically
close and, in-flight, the auxiliary buses
will not be powered
L (R) ESS BUS FAIL TO/LAND Affected bus is not powered
L (R)
GEN OVERLOAD TO/LAND Respective generator load exceeded 500 amp
L (R) MAIN BUS FAIL TO/LAND The affected MAIN bus is not powered
L (R) AUX BUS FAIL
TO/LAND
The affected auxiliary BUS is not powered with
a power source available
L (R) AUX BUS OFF TO/LAND Respective AUX BUS is selected off
ELECTRICAL FAULT TO/LAND
An electrical system fault occurred, resulting in
loss of redundancy in the display of electrical
indications
4
ELECTRICAL
Sep 14/2005 Flight Crew Operating Manual Volume 2
REV 4 CSP 100-6 07-01-19
STBY INST BATT
FAULT TO/LAND
At least one of the following has occurred:
- Standby instrument heater is inoperative
- Standby instrument battery charger is inoperative
- Standby instrument battery temperature is
greater than 80 °C
- At least two cells of the standby instrument
battery have failed
APU GEN OFF APU GEN switch has been selected OFF
L (R) BATT OFF
The affected battery has been selected OFF
BUS TIE MAN OPEN
The bus tie has been manually selected open.
This prevents automatic operation of the bus
tie. Pressing the BUS TIE switch a second time
restores automatic control
ELEC HYD GEN ON The optional hydraulic motor driven generator
(HMDG) has been activated
L (R) GEN OFF The affected engine generator switch has been
selected OFF
MESSAGE INHIBITS MEANING
AURAL
WARNING
REV 4
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