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OVERHEAD MAINTENANCE
PANEL
2
OFF
FIELD
OFF
FIELD
BREAKER
SPLIT SYSTEM
1 APU
OFF
FIELD
OFF
FIELD
OFF
FIELD
OFF
FIELD
OPEN
1 2 3 4
GEN FIELD MAN RESET
1
2
3
4
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.10.8 D6-30151-425
Electrical -
Controls and Indicators
Electrical Synoptic Display
The electrical synoptic displays by pushing the ELEC Synoptic switch on the
display select panel. Display select panel operation is described in Chapter 10,
Flight Instruments, Displays.
The synoptic displays the configuration of the AC power system in a simplified
schematic format. DC power flow is not represented. The depiction is generated
by the status of various system breakers and conductors and does not represent
actual power flow. Therefore, the display may not be an accurate representation of
system operation. Symbols display in low intensity white when source data is
invalid or unavailable.
During autoland, with bus tie breakers 1, 2, and 3 open, the message
“ELECTRICAL SYNOPTIC INHIBITED FOR AUTOLAND” appears on the
synoptic display.
GALLEY
UTILITY
GALLEY
UTILITY
GALLEY
UTILITY
EXT 1 APU 1 APU 2 EXT 2
BUS TIE
SSB
DRIVE
PRESS
TEMP/
OFF OFF
ISLN ISLN
GALLEY
UTILITY
1 2 3 4
DRIVE
GEN CONT
BUS 1 BUS 2 BUS 3 BUS 4
NO POWER FLOW (WHITE)
POWER FLOW (GREEN)
LOWER EICAS DISPLAY
4
5
6
7
2
1
3
December 01, 1999
747 Operations Manual
Electrical -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.10.9
1 Split System Breaker (SSB)
Closed - both sides of synchronous bus connected
Open - synchronous bus split.
2 Bus Tie (ISLN)
• power flow bar present - bus tie breaker closed
• ISLN (amber) - bus tie breaker open
3 UTILITY Bus
UTILITY -
• green - utility bus powered
• amber - utility bus not powered
4 AC BUS
BUS 1, 2, 3, 4 -
• green - AC bus powered
• amber - AC bus not powered
5 Generator Control Breaker (GEN CONT)
• power flow bar present - generator control breaker closed
• OFF (amber) - generator control breaker open
6 Generator Drive (DRIVE)
• blank - normal operation
• DRIVE TEMP/PRESS (amber) - drive has high oil temperature or low oil
pressure
7 GALLEY Bus
GALLEY -
• green - galley bus powered
• amber - galley bus unpowered
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
6.10.10 D6-30151-425
Electrical -
Controls and Indicators
Battery Condition
Battery condition displays on the status page by pushing STAT Display switch on
the display select panel. Display select panel operation is described in Chapter 10,
Flight Instruments, Displays.
1 Battery Voltage (V-DC)
Main and APU battery voltage.
2 Battery Current (A-DC)
Main and APU battery amperage.
3 Battery Charge Status
DIS (Discharge) - battery discharging.
CHG (Charge)
• battery charging
• if battery current is zero, charge status is blank
1
MAIN BATT
APU BATT
27 10
28 15
CHG
DIS
V-DC A-DC
V-DC A-DC
2
3
LOWER EICAS DISPLAY
December 01, 1999
747 Operations Manual
Electrical Chapter 6
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 6.20.1
Introduction
The electrical systemgenerates and distributes AC and DC power to other airplane
systems and is comprised of main AC power, DC power, and standby power
components. System operation is automatic. Electrical faults are automatically
detected and isolated.
AC Electrical System
The AC electrical system is the main source of airplane electrical power.
Electrical Load Management and Load Shedding
Electrical system overload protection is provided by a load management system
configured to ensure power is available to critical and essential equipment.
If electrical loads exceed power available (airplane or external), the load
management system sheds AC loads by priority until the loads are within the
capacity of airplane or ground power generators. Loads are shed one at a time
through electrical load control units (ELCUs) in a programmed sequence until the
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