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flight.
External DC Switch
Displays status of DC external power:
AVAIL Light − Comes on to indicate
that external DC power is connected
and is operating within limits.
ON Light − Indicates external DC
power is powering the APU battery
direct bus.
BATT MASTER Switch
Used to control battery power.
OFF − Isolates the battery
bus from the batteries.
EMS − Electrical Management
System is in maintenance
mode.
ON − Battery bus is powered
by battery or external DC power
if selected on (only if no AC
power on the airplane).
GF0710_034
ELECTRICAL
ON
BATT MASTER
OFF
EMS
ON ON
AVAIL AVAIL
EXT AC EXT DC
PUSH OFF/RESET
OFF OFF
FAIL FAIL
GEN 3 GEN 4
OFF
FAIL
GEN 2
OFF
FAIL
GEN 1
OFF
FAIL
APU GEN
PUSH
OFF/RESET
OFF
ON
RAT GEN
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−28
DC SYSTEM EICAS MESSAGES
BATT BUS FAIL
Indicates that battery
bus is not powered
due to a fault.
BATT MASTER OFF
Indicates that the battery
switch is not on.
DC EMER BUS FAIL
Indicates that DC
EMER BUS is not
powered due to a fault.
APU (AV) BATT FAIL
Indicates that APU (AV)
battery has failed, voltage or
temperature is out of range.
DC BUS 1 (2) FAIL
Indicates that
affected DC bus is not
powered due to a fault
or is shed.
DC ESS BUS FAIL
Indicates that
DC ESS BUS is not
powered due to a fault.
ELEC SYS FAIL
(on ground only)
Indicates that a major
fault has been detected in
the electrical system.
GF0710_035
APU BATT FAIL
AV BATT FAIL
BATT MASTER OFF
BATT BUS FAIL
DC BUS 1 FAIL
DC BUS 2 FAIL
DC ESS BUS FAIL
DC EMER BUS FAIL
ELEC SYS FAIL
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
07−10−29
DC SYSTEM EICAS MESSAGES (CONT'D)
EXT DC PWR AVAIL
Indicates that external
DC power is available.
APU (AV) BATT CHGR FAIL
Indicates that affected battery
charger has detected a fault
and has shut down.
TRU 1−2 FAIL
ESS TRU 1−2 FAIL
Indicates that affected
TRU has failed.
EXT DC PWR ON
Indicates that external
DC power has been
selected on.
BATT BUS MAN OFF
DC BUS 1 (2) MAN OFF
DC ESS BUS MAN OFF
Indicates that affected DC
bus has been manually
isolated. DC essential
cannot be manually isolated
if battery has been isolated
and vice versa.
BATT EMER PWR ON
Indicates that the batteries
are feeding the DC ESS
BUS and BATT busses in
an emergency condition.
ELEC SYS FAULT
(on ground only)
Indicates that a minor
fault has been detected in
the electrical system.
CB TRIP
Indicates that a circuit
breaker has tripped.
GF0710_036
APU BATT CHGR FAIL
AV BATT CHGR FAIL
BATT EMER PWR ON
CB TRIP
ELEC SYS FAULT
EXT DC PWR AVAIL
ESS TRU 1 FAIL
ESS TRU 2 FAIL
TRU 1 FAIL
TRU 2 FAIL
BATT BUS MAN OFF
DC BUS 1 MAN OFF
DC BUS 2 MAN OFF
DC ESS BUS MAN OFF
EXT DC PWR ON
ELECTRICAL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
07−10−30
DC 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.
BATT BUS FAIL
Indicates that battery
bus is not powered
due to a fault.
BATT MASTER OFF
Indicates that the battery
switch is not on.
DC EMER BUS FAIL
Indicates that DC
EMER BUS is not
powered due to a fault.
APU (AV) BATT FAIL
Indicates that APU (AV)
battery has failed, voltage or
temperature is out of range.
DC BUS 1 (2) FAIL
Indicates that
affected DC bus is not
powered due to a fault
or is shed.
DC ESS BUS FAIL
Indicates that
DC ESS BUS is not
powered due to a fault.
GF0710_037
APU BATT FAIL
AV BATT FAIL
BATT MASTER OFF
BATT BUS FAIL
DC BUS 1 FAIL
DC BUS 2 FAIL
DC ESS BUS FAIL
DC EMER BUS FAIL
ELECTRICAL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
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