*
Battery
*
Battery #2
*
APU battery.
The ground service bus normally supplies power to the hot battery and APU battery buses through their related battery chargers.
The captain’s flight instrument bus normally supplies power to the battery and battery #2 buses.
Flight Control Power
Three FCDC PSAs supply power to the flight control system. The PSAs have more than one power source. Each PSA has a small battery to prevent power interruptions during power transfers.
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ELECTRICAL POWER -GENERAL DESCRIPTION -DISTRIBUTION
Towing Power
The towing power system supplies power only to components that are necessary to safely tow the airplane. You operate the system manually.
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ELECTRICAL POWER -GENERAL DESCRIPTION -DISTRIBUTION
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ELECTRICAL POWER -COMPONENT LOCATIONS -AIRPLANE
General
There are electrical power components in these areas:
*
Flight deck
*
E5 rack
*
Wing-to-body fairing
*
APU gearbox
*
E10 rack
*
Engine main gearbox
*
Engine intermediate case
*
Door 2 left
*
Main equipment center
*
Right-forward fuselage.
Flight Deck
The electrical power system control switches are on the P5 overhead panel and the P61 overhead maintenance panel.
E5 Rack
Some of the FCDC components are in the E5 rack just aft of the forward cargo door.
Wing-to-Body Fairing
The RAT generator is in the wing-to-body fairing aft of the right main gear.
APU Gearbox
The APU generator attaches to the APU gearbox.
E10 Rack
The APU battery and battery charger are in the E10 rack just aft of the bulk cargo door.
Engine Main Gearbox
A backup generator attaches to the forward side of the main gearbox on each engine. The IDG attaches to the aft side.
Engine Intermediate Case
The IDG and backup generator air-oil heat exchangers are under the inner liner of the engine intermediate case.
Door 2 Left
The ground service switch is on the flight attendant’s panel by door 2 left.
Main Equipment Center
Most of the electrical system components are in the main equipment center. The main battery is there. The rest are in equipment racks or the ELMS panels.
Right-Forward Fuselage
The external power panel is to the right of the main equipment center access door.
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ELECTRICAL POWER -COMPONENT LOCATIONS -AIRPLANE
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ELECTRICAL POWER -GENERAL COMPONENT LOCATIONS -MAIN EQUIPMENT CENTER
General * E3
* E4. Most of the electrical system components are in equipment racks or the ELMS panels.
The specific locations of components are in their related sections.
The ELMS section shows the specific location of components inside the ELMS panels.
Panels
All the ELMS panels contain electrical system components. These are the ELMS panels:
*
P200 right power panel
*
P210 right power management panel
*
P300 auxiliary power panel
*
P100 left power panel
*
P110 left power management panel
*
P310 standby power management panel
*
P320 ground service/handling power panel.
Racks
These main equipment center racks contain electrical system components:
*
E1
*
E2
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ELECTRICAL POWER -GENERAL COMPONENT LOCATIONS -MAIN EQUIPMENT CENTER
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777 AIRCRAFT MAINTENANCE MANUAL
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ELECTRICAL POWER -OPERATION -GENERAL
General
The electrical panel is on the P5 overhead panel. The panel has four momentary-action switches and eight alternate-action switches. You use these to operate most of the electrical system. These are the momentary-action switches:
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