24-CONTENTS
GUN Page 9 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CHAPTER 24 - ELECTRICAL POWER
TABLE OF CONTENTS
_________________
Chapter Section Subject_______ Subject
AC ELECTRICAL LOAD DISTRIBUTION 24-50-00
_______________________________
Description and Operation
General
Distribution - AC Power, 115
Volt
Distribution - AC Power, 28
Volts
Operation
Component Location
Component Index
Component Location
Adjustment/Test AC ELECTRICAL LOAD DISTRIBUTION 24-50-01 Removal/Installation 115-VOLT AC POWER DISTRIBUTION 24-51-00
Description and Operation
General
Relay - Cargo Handling, Main
Deck
Relay - Ground Handling
Relay - Ground Service Select
Unit - Control, Electrical
Load Unit - Sense, Instrument Bus Voltage Operation RELAYS - CARGO HANDLING, MAIN 24-51-04 DECK Removal/Installation [*] AIRPLANES WITH MAIN DECK CARGO HANDLING
RELAYS - GROUND HANDLING AND 24-51-01 GROUND SERVICE SELECT Removal/Installation UNIT - ELECTRICAL LOAD CONTROL, 24-51-05 UTILITY POWER Removal/Installation
Page
1 11
1
1101
501 401 1
131
3333
401
401
401
Effectivity
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24-CONTENTS
GUN Page 10 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CHAPTER 24 - ELECTRICAL POWER
TABLE OF CONTENTS_________________
Chapter
Section
Subject Subject_______ _______ Page____
UNIT - VOLTAGE SENSE, INSTRUMENT 24-51-07
BUS
Removal/Installation 401
28-VOLT AC POWER DISTRIBUTION 24-53-00
Description and Operation 1
General 1
Transformer - AC, 28-Volts 1
Operation 1
TRANSFORMER - 28-VOLT AC 24-53-01
Removal/Installation 401
DC ELECTRICAL LOAD DISTRIBUTION 24-60-00_______________________________
Description and Operation 1
General 1
Distribution - DC Power, 28-Volt 1
Operation 1
Component Location 101
Component Index
Component Location
Adjustment/Test 501
BREAKER - CIRCUIT, REMOTE 24-60-01
CONTROL
Removal/Installation 401
28-VOLT DC POWER DISTRIBUTION 24-61-00
Description and Operation 1
General 1
Operation 1
Effectivity
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24-CONTENTS
GUN Page 11 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1.
2.
3.
A
747-400 MAINTENANCE MANUAL
ELECTRICAL POWER - DESCRIPTION AND OPERATION
____________________________________________
General
_______
A. The electrical power generating system (EPGS) consists of system components which generate, control, protect and distribute both ac and dc electrical power to the airplane.
B. Electrical power supplied by the engines is used for all normal flight operations. Engine power consists of four integrated drive generators (IDGs).
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