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the only source of AC power) and power is removed from "external power ON
mode" loads (ground handling and ground service modes remain powered).
Illuminated (white) – external power is powering the 115 Vac / 235 Vac buses and
loads associated with "external power ON mode".
Illuminated (white) –
• external power is plugged in and power quality is acceptable
• power contactor is not closed, or is closed with the airplane in ground
handling or ground service mode(s)
• extinguishes when the ON light illuminates.
ON – arms the generator breaker to close automatically when generator power is
available.
OFF –
• opens the generator field and generator control breaker
• resets any protective trips / functions in GCU.
2 Battery OFF Light
3 In-Flight Entertainment/Passenger Seats (IFE/PASS SEATS) Power
4 IFE/PASS SEATS OFF Light
5 Forward External Power (EXT PWR) Switches
6 Forward External Power ON Lights
7 Forward External Power AVAIL Lights
8 Generator Control (GEN CTRL) Switches
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
Boeing Proprietary 6.10.3
Illuminated (amber) – the generator control breaker is open.
Push –
• disconnects generator from engine if:
• airplane is on the ground, engine N2 is less than 80%, and fuel control
switch is in RUN, or
• a drive fail signal is active (low generator oil pressure or both PMG
low voltage with engine running)
• Requires maintenance action on the ground to reconnect generator.
Illuminated (amber) –
• generator oil pressure is low, or
• loss of output voltage from both generator PMGs (indicating a drive shaft
failure).
ON – powers cabin and utility systems when AC power is available, and load
management supports these loads.
OFF – removes power from cabin and utility systems
Illuminated (amber) – CABIN/UTILITY power switch is selected OFF.
ON – arms APU generator breaker to automatically close when generator power
is available.
OFF –
• opens the generator field and generator control breaker
• resets any protective trips / functions in GCU.
Illuminated (with the APU running) (amber) –
• the APU GEN switch is selected OFF (TBD), or
• the APU generator breaker is open because of a fault.
Push – (with AVAIL light illuminated) closes the external power contactor for the
L2 Autotransformer Rectifier Unit (ATRU) and powers L2 ±270 Vdc bus.
Push – (with ON light illuminated) opens external power contactor for the L2
Autotransformer Rectifier Unit (ATRU) and removes power from L2 ±270 Vdc
bus.
9 Generator OFF Lights
10 Generator Drive Disconnect Switches
11 Generator DRIVE Lights
12 Cabin/Utility (CABIN/UTILITY) Power Switch
13 CABIN/UTILITY Power OFF Light
14 APU Generator (APU GEN) Switch
15 APU Generator OFF Light
16 AFT External Power (EXT PWR) Switches
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
6.10.4 Boeing Proprietary
Illuminated (white) – external power is powering the buses.
Illuminated (white) –
• external power is plugged in and power quality is acceptable (the external
power contactor is not closed)
• extinguishes when the ON light illuminates.
Towing Power Panel
Illuminated (white) –
• towing battery TEST switch is pushed with TOWING POWER switch
ON (BATTERY switch OFF and no AC power).
• HIGH illuminated – a minimum of one hour (TBD) is available before
battery is depleted.
• MEDIUM illuminated – a minimum of 30 minutes (TBD) is available
before battery is depleted.
• LOW illuminated – a minimum of 15 minutes (TBD) is available
before battery is depleted.
Note: Minimum times assume steady state towing (no braking) before battery is
depleted. If heavy braking occurs, the battery voltage may decrease and
illuminate a different light and / or may decrease the time available on
battery power below the minimum times listed.
Push (BATTERY switch OFF) – illuminates applicable towing battery charge
light (HIGH, MEDIUM, or LOW) depending on current voltage.
17 AFT External Power ON Lights
18 AFT External Power AVAIL Lights
1 Towing Battery Charge Lights
2 Towing Battery Test Switch
TOWING POWER PANEL
1
2
PRELIMINARY
3
4
787 Flight Crew Operations Manual
Electrical -
Controls and Indicators
Boeing Proprietary 6.10.5
　
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