ELECTRICAL POWER -INDICATION -INTRODUCTION

EFFECTIVITY BEJ ALL  24-00-00 
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ELECTRICAL POWER -INDICATION -ELECTRICAL SYNOPTIC DISPLAY

General
The electrical synoptic display is a simplified schematic of the electrical system. It shows the system configuration for these parts of the ac and dc generation systems:
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Power sources

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Buses

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BTBs

*
Generator drives

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Main and APU batteries.

Green flow segments show electrical power flow from power sources to buses.
Power Sources
The electrical synoptic display shows power flow from these power sources:
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IDG

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APU generator

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Backup generator

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Primary and secondary external power.

It also shows the position of the breakers for the power sources.
A white box shows when the power source is off or the breaker is open. A green box shows when the power source is on or the breaker is closed. An amber box and X show if there is a fault with the power source or a fault with the breaker.
Buses
The electrical synoptic display shows these buses green when they receive power:
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Main ac buses

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Transfer buses

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Utility buses.

BEJ ALL POST SB 777-31-0067
When the ELMS does a load shed, the message, LOAD SHED shows below the utility bus indication for the related channel.
BEJ ALL
BTB Status
The electrical synoptic display shows the BTB positions. An amber ISLN shows when a BTB is open because of a fault.
Drive Status
The electrical synoptic display shows the IDG drive condition. The amber word DRIVE shows when the IDG has low oil pressure. An amber box and X show if the IDG is disconnected and the engine is running.
Main and APU Battery Output
The electrical synoptic display shows the voltage and current output for the main and APU batteries. It also shows indications for battery charge and discharge.
EFFECTIVITY BEJ ALL  24-00-00 
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D633W101-BEJ  May 05/2003 

ELECTRICAL POWER -INDICATION -ELECTRICAL SYNOPTIC DISPLAY

EFFECTIVITY BEJ ALL PRE SB 777-31-0067  24-00-00 
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D633W101-BEJ  May 05/2003 

ELECTRICAL POWER -INDICATION -ELECTRICAL SYNOPTIC DISPLAY

EFFECTIVITY BEJ ALL POST SB 777-31-0067  24-00-00 
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D633W101-BEJ  May 05/2003 

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

24-00-00

Page 25 D633W101-BEJ Sep 05/2002

ELECTRICAL POWER -INDICATION -ELECTRICAL MAINTENANCE PAGE 1

General
The electrical system has two maintenance pages. Page 1 has information on these items:
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AC generation

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DC generation

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Generator oil information

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Fly-by-wire (FBW) output

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Auto-event messages.

AC Generation
The maintenance page shows these indications for the ac generation system power sources:
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Voltage

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Frequency

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Load.

The load is a percent of maximum output.
DC Generation
The maintenance page shows the voltage, and the load in amps, for the dc generation system power sources. Charge (CHG) and discharge (DIS) also show for the batteries.
Generator Oil Information
The maintenance page shows these indications for the IDGs and backup generators:
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Oil outlet temperature

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Oil rise temperature

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Oil level

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Oil filter message.

See the generator drive section for more information about generator oil indications (SECTION 24-10).
FBW Output
The maintenance page shows the voltage, and load in amps, for the FCDC buses.
EFFECTIVITY BEJ ALL  24-00-00 
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D633W101-BEJ  Sep 05/2002 

ELECTRICAL POWER -INDICATION -ELECTRICAL MAINTENANCE PAGE 1

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D633W101-BEJ  Sep 05/2002 

ELECTRICAL POWER -INDICATION -ELECTRICAL MAINTENANCE PAGE 2

General
The electrical system has two maintenance pages. Page 2 is shown below. This page shows which buses are receiving power.
An ON next to the name of the bus means that it is receiving power. An OFF means that it is not receiving power.
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