787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Electrical -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 6.20.11
“External Power On” mode – When at least one forward external power receptacle
is connected and selected ON with the APU and engine generators off.
Significant loads energized by this mode with only one forward external power
source connected and selected ON include:
Additional loads energized by this mode with two forward external power sources
connected and selected ON include:
Note: Cargo heat is inoperative with only forward external power connected.
“In-Air Rat Only Operation” mode (Standby Power) – If loss of all electrical
power to captain’s and first officer’s flight instruments occurs in flight, the RAT
energizes the captain’s flight instruments and other essential equipment for flight
controls, navigation, and communication. The main battery provides standby
power until RAT deployment. Significant loads energized by this mode include:
Note: Autothrottle, flaps, slats, stabilizer, thrust reversers, auto speedbrakes, air
conditioning / pressurization, Head-Up displays, HF radios, SATCOM
systems, external lighting, WIPS, and window heat are inoperative on
standby power.
“In-Air Battery Only” mode (Standby Power) – This mode energizes the same
equipment as the “In-Air RAT Operation Only” mode with the exception of center
pitot heat.
• flight deck equipment, controls, and
indications
• cabin systems (limited operation)
• cabin lighting (limited
operation)
• NGS (limited operation)
• hydraulics (limited operation)
• IFE (limited operation)
• cabin systems (basic
operation)
• cabin lighting (basic
operation)
• captain’s inboard DU
• captain’s outboard DU
• lower DU
• autoflight system
• MCP
• autopilot
• captain’s / first officer’s ACP
• captain’s / first officer’s
flight interphone
• VHF L
• TCP L
• DSP L
• MFK L
• CCD L
• IRU L, R
• AHRU L, R
• INR L, R
• ISFD
• FMC
• PFC
• CCR L
• center pitot heat
• engine/APU fire detection
• miscellaneous lighting
February 15, 2010
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