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power essential TRU 1 and the DC essential bus, the batteries will act as a backup
power source to the DC essential bus.
REV 56, Jan 31/03
Vol. 1 07--30--6
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
DC Electrical System EICAS Indications <MST>
Figure 07---30---3
Status Page
<0039> <0006>
<0039>
<0039>
Primary Page
Vol. 1 07--30--7
REV 56, Jan 31/03
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
DC Emergency Bus <MST>
Figure 07---30---4
DC ELEC Page
EICAS Display
Center Instrument Panel
During normal operation,
when the DC emergency
bus is powered by both the
battery bus and the APU
battery direct bus, the DC
emergency bus outline and
respective flow lines are not
displayed.
NOTE
EICAS BUS BAR
OUTLINE GREEN AMBER WHITE HALF--INTENSITY
MAGENTA
Invalid data
Invalid data
SERV BUS _ Invalid data
ESS BUS
BATT BUS _ Invalid data
_ Invalid data
Invalid data
Bus not powered
Bus not powered _ Invalid data
Bus powered
Bus powered
Bus powered
Bus powered
Bus powered
_
Bus not powered
Bus not powered
Bus not powered
_
Battery less _
than 18 VDC
Battery less
than 18 VDC
Battery 18 VDC
or greater
Battery 18 VDC
or greater
UTIL BUS 1
UTIL BUS 2
BUS 2
EICAS BUS BAR
OUTLINE GREEN WHITE AMBER HALF--INTENSITY
MAGENTA
_
External dc in use Invalid data
_
APU
BATT
MAIN
BATT
APU BATT
DIR BUS
MAIN BATT
DIR BUS
BUS 1
Battery less
than 18 VDC
Less that 18V or
greater than 32V.
Always displayed
between 18V & 32V.
Battery 18 VDC
or greater
DC Emergency Bus Flow
Lines
Green -- DC emergency
bus is powered through
the respective flow line
only, or the respective
feeder bus is available
to feed the failed DC
emergency bus.
White -- DC emergency
bus is not powered
through the respective
flow line.
DC Emergency Bus
Outline
Green -- DC emergency
bus is powered by only
one of the following:
Battery bus or,
APU battery direct bus.
Amber -- DC emergency
bus is not powered
CHARGER (Amber)
Indicates that the
corresponding charger
is not charging.
CHARGER (White) <0039>
VA
REV 56, Jan 31/03
Vol. 1 07--30--8
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual MASTER
CSP A--013
External DC Flow Line
Figure 07---30---5
External DC Flow Line
Displayed when external
DC power is connected.
Corresponds to DC
AVAIL/IN USE
switch/light.
DC ELEC Page
EICAS Secondary Display
Center Instrument Panel
SERVICE CONFIGURATION (Amber)
Indicates that the DC SERVICE switch
has been selected ON. Only the DC
service bus will be powered.
SERVICE BUS
(Service Configuration)
Displayed when the
DC Service switch
is selected ON.
Either the battery master
switch or external DC must
be selected ON.
NOTE
Vol. 1 07--30--9
REV 56, Jan 31/03
ELECTRICAL
DC Electrical System
Flight Crew Operating Manual
CSP A--013
MASTER
E. DC Loads Distribution
DC BUS 1 (CBP--1)
Spoiler Electronic Unit
Spoiler Electronic Control
System (PWR 1)
Heaters, Static (R) and ADS
Controller (R)
Cockpit Temperature Control
Left Windshield Heat Controller
14th--Stage Bleed Air Isolation
and Shutoff Valve (L)
10th--Stage Bleed Air Isolation
and Shutoff Valve (L)
Anti--ice Automatic NORM (1)
Proximity Sensor (Landing Gear
Control/Door 1)
(Weight--on--wheels 1)
Lights (cockpit floor, rear
anti--collision, wing inspection)
Maintenance Diagnostic
Computer
DME 1
Radio Altimeter
Flight Data Recorder Control
Weather Radar (receiver,
transmitter and control)
EICAS Primary Display
EICAS Secondary Display
Left Lamp Driver Unit
Bright/dim Power supply unit
Data Loader
Flap Control (CH 1)
Nose Landing Lights
Brake Temperature Monitor
FMS (CDU 1) <0024><0050>
DC Tie Control
Bus 1 Feed Utility
Bus 1 Feed
DC 1 power Sensing
TRU 1 Power Sensing
AC Utility Bus Control
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