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BUS 2 BUS 1  Bus powered  Bus not powered  _  Invalid data   
UTIL BUS 1 UTIL BUS 2  Bus powered  _  Bus not powered  Invalid data   
ESS BUS  Bus powered  Bus not powered  _  Invalid data   
BATT BUS  Bus powered  Bus not powered  _  Invalid data   
SERV BUS  Bus powered  Bus not powered  _  Invalid data   
APU BATT DIR BUS  Battery 18 VDC or greater  Battery less than 18 VDC  _  Invalid data   
MAIN BATT DIR BUS  Battery 18 VDC or greater  Battery less than 18 VDC  _  Invalid data   
EICAS BUS BAR OUTLINE  GREEN  WHITE  AMBER  HALF- 
INTENSITY MAGENTA   
APU BATT  MAIN BATT  Battery 18 VDC or greater  External dc in use  Battery less than 18 VDC  Invalid data   
V A   
 Always displayed between 18V & 32V.  Less that 18V or greater than 32V.  _  _ 
DC Emergency Bus <MST>  
Figure 07---30---4 
 
Flight Crew Operating Manual  MASTER   
CSP A- 
013  
 
 ELECTRICAL DC Electrical System  Vol. 1  07- 
30- 
8   
REV 56, Jan 31/03  
SERVICE CONFIGURATION (Amber)  
Indicates that the DCSERVICE switch has been selectedON. Only theDC 
Corresponds to DC AVAIL/INUSE switch/light.  
SERVICE BUS  
(Service Configuration) 
 
Displayedwhenthe  
DCService switch  
is selectedON. 
NOTE 
Either the battery master switch or externalDC must be selectedON.  
External DC Flow Line  
Figure 07 ---30 ---5 
 
Flight Crew Operating Manual  MASTER   
CSP A- 
013  
 
 ELECTRICAL  Vol. 1  07- 
30- 
9  
DC Electrical System  REV 56, Jan 31/03  
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 Left Air Conditioning Unit DME (1) Smoke detector Passenger signs Overboard shutoff Valve Pilots Wiper (motor and control) Anti-Skid GPS (1) <0027><0047> Hydraulic System (AC pump control 2 and 3B, fan control, Indicator 2) 
 
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