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ON – (BATTERY switch off and no AC power)
• selects hot battery bus and APU hot battery bus power for towing
operation loads, including:
• captains audio control panel / flight interphone
• flight deck dome lights
• wing and tail position lights
• brakes
• applicable towing battery charge light illuminates, depending on current
battery voltage (HIGH, MEDIUM, LOW).
OFF – (BATTERY switch OFF and no AC power)
• removes power for towing operations
Illuminated (white) – the battery TOWING POWER switch is ON.
Electrical Synoptic Display
The electrical synoptic is displayed by pushing the systems (SYS) display switch
on the display select panel, then selecting the electrical (ELEC) synoptic key.
Display select panel operation is described in Chapter 10, Flight Instruments,
Displays.
3 Battery TOWING POWER Switch
4 ON BAT Light
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
6.10.6 Boeing Proprietary
Circuit Breaker Indication and Control (CBIC)
The CBIC provides both indication and control for Electronic Circuit Breakers
(ECB), and indication only for Thermal Circuit Breakers (TCB). The CBIC can
be accessed from the Multi-Function Display (MFD). Selecting CB from the
systems menu displays the list of circuit breakers. The list can be sorted by various
categories. Individual circuit breakers operational status is represented by an icon,
depicted as follows:
(AMBER)
NOT SUPPLYING POWER
POWER FLOWING
(GREEN)
POWER NOT FLOWING
(WHITE)
MULTIFUNCTION DISPLAY (MFD)
OR FAILED
(AMBER)
BUS TIE OPEN DUE TO
(AMBER)
BUS TIE SWITCH OFF
ELECTRICAL FAULT OR
CHG ... BATTERY CHARGING
CTRL .. CONTROL
DISCH . BATTERY DISCHARGING
DRIVE . OIL PRESSURE LOW
ISLN ..
STARTER ON
(GREEN)
START
POWER
INDICATION
(GREEN)
DRIVE DISCONNECTED
ENGINE RUNNING
(AMBER)
ON OR AVAILABLE
(GREEN)
OFF
(WHITE)
INVALID
DATA
(WHITE)
BUS
POWERED
(GREEN)
BUS
OFF
(AMBER)
BUS
INVALID
(WHITE)
PRELIMINARY
AFT EXT PWR
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
Boeing Proprietary 6.10.7
(green, hollow icon) – ECB is closed (circuit powered).
Note: This is the same for a closed TCB state.
1 ECB closed
MULTIFUNCTION DISPLAY (MFD)
2
4
3
5
1
PRELIMINARY
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
6.10.8 Boeing Proprietary
(white, solid icon) – ECB is open (circuit not powered).
Note: TCB icon for open or tripped breaker is an open (pulled) icon with a white
cross-hatch shaft.
(amber, solid icon) – ECB is tripped (open, circuit not powered) due to a fault.
(cyan lock) – ECB is open (circuit not powered) and collared for dispatch.
(cyan lock) – ECB is open (circuit not powered) and collared for maintenance
purposes.
2 ECB open
3 ECB tripped
4 ECB collared / tagged INOP
5 ECB collared / tagged DO NOT CLOSE
787 Flight Crew Operations Manual
Electrical Chapter 6
System Description Section 20
Boeing Proprietary 6.20.1
6.20 Electrical-System Description Introduction
The Electrical Power Generation and Start System (EPGSS) generates,
distributes, controls, and protects airplane electrical power.
AC Electrical System
The AC electrical system is the main source for airplane electrical power.
AC Electrical System Power Sources
The main AC electrical power sources are:
• Variable Frequency Starter Generators (VFSG)
• APU Starter Generators (ASG)
• External power
• Ram Air Turbine (RAT).
Variable Frequency Starter Generators (VFSG)
Each engine has two Variable Frequency Starter Generators. The VFSGs function
as both starters and generators. They operate in tandem to electrically start the
engine, then function as generators to provide power to their respective main AC
buses.
Each VFSG has a disconnect device that allows the generator to be mechanically
disengaged from the engine. It is automatically activated when the VFSG sump
oil exceeds a predetermined temperature.
It may be activated manually by pushing the DRIVE DISC disconnect switches
on the electrical panel. The respective generator will then disconnect if its control
unit logic verifies that:
• airplane is on the ground, engine N2 is less than 80%, and fuel control
　
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