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TLC 1
TTC 2
TTC 1 TLC 3 TTC 4
TLC 2
TTC 3 TLC 4
ETC
K5
TRU 1
ESS TRU 1
ESS TRU 1
ESS TRU 2
TRU 2
TRU 1
ESS TRU 2
ESS TRU 1
TRU 2
TRU 1
TRU 2
ESS TRU 2
APU BATT
DIRECT BUS
EXT
DC
EXT
PWR
EPC
AVIONICS BATT
DIRECT BUS
EBBC 1
K6
SSPC 4
K10
SSPC 5
K3 (ASCA)
SSPC 1
K7
SSPC 2
K8
SSPC 3
K9
ETTC
TRU 1
ESS TRU 1
ESS TRU 2
TRU 2
AVIONICS BATT
APU BATT
EXT DC
AVIONICS
BATTERY
APU
BATTERY
AC
BUS
3A
K1
K1
K2
K3 K4
ESS
TRU 2
TRU 2
ESS
TRU 1
TRU 1
CCBP
DCPC
ASCA
CR 1
CR 4
CR 6 CR 7
CR 5
CR 2 CR 3
CBC6
CBC4
DC ESS BUS BATT BUS
DC
EMERGENCY
BUS
6-24 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
ELECTRICAL PANEL
External DC power is controlled manually. Battery master must be selected ON for all
phases of flight.
ELECTRICAL
EXT AC
AVAIL
ON
FAIL
OFF
GEN 1
FAIL
OFF
EXT DC
AVAIL
ON
GEN 3 GEN 4
FAIL
OFF
GEN 2
FAIL
OFF
PUSH OFF/RESET
PUSH
OFF/RESET
APU GEN
FAIL
OFF
RAT GEN
ON
OFF
BATT MASTER
EMS
OFF
ON
ASTE
E
OF
BATT MASTER Switch
OFF
EMS
ON
Used to control battery power.
• - Isolates the battery bus
from the batteries.
• - Electrical Management
System is in maintenance
mode. Batteries supply power to
EMS only.
• - Battery bus is powered
by battery (only if no AC power
on the airplane)
External DC Switch
AVAIL Light
ON Light
Displays status of DC external power:
• - Comes on to indicate
that external DC power is connected and
is operating limits.
• - Indicates external DC
power is powering APU BATT DIR BUS.
within
GX_06_024
For Training Purposes Only
Sept 04
6-25
P I LOT T R A I N I N G GU I D E
ELECTRICAL
DC SYSTEM EICAS MESSAGES
BATT MASTER OFF
Indicates that the
battery switch is off.
BATT BUS FAIL
Indicates that battery
bus is not powered,
due to a fault.
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.
GX_06_025
789
1 . 65
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
6-26 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
ELECTRICAL
DC SYSTEM EICAS MESSAGES
789
1 . 65
GX_06_026
DC BUS 1(2) XFER FAULT
DC ESS BUS XFER FAULT
BATT BUS XFER FAULT
Indicates that transfer of
alternate power supply to
affected bus is lost.
EXT DC PWR AVAIL
Indicates that external
DC power is available.
BATT EMER PWR ON
Indicates that the batteries
are feeding the DC ESS
BUS and BATT buses in
an emergency condition.
BATT BUS MAN OFF
DC BUS 1 (2) MAN OFF
DC ESS BUS MAN OFF
Indicates that affected
DC bus has been
manually isolated.
APU (AV) BATT CHGR FAIL
Indicates that affected battery
charger has detected a fault
and has shut down.
TRU 1 (2) FAIL or
ESS TRU 1 (2) FAIL
Indicates that affected
TRU has failed.
EXT DC PWR ON
Indicates that external
DC power has been
selected on.
APU BATT CHGR FAIL
AV BATT CHGR FAIL
DC BUS1 XFER FAULT
DC BUS2 XFER FAULT
DC ESS XFER FAULT
BATT BUS XFER FAULT
EXT DC PWR AVAIL
BATT EMER PWR ON
TRU 1 FAIL
TRU 2 FAIL
ESS TRU 1 FAIL
ESS 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
For Training Purposes Only
Sept 04
6-27
P I LOT T R A I N I N G GU I D E
ELECTRICAL
　
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