GUN Page 6 May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 CHAPTER 24 - ELECTRICAL POWER
 TABLE OF CONTENTS
_________________
 Chapter
 Section
 Subject_______  Subject_______ 
BATTERIES  24-31-00
 Description and Operation 
General 
Component Details 
APU Battery Charger 
Interlock Relay
 Batteries 
Battery Chargers 
Battery Current Monitor 
Battery Shunts 
DC Under Voltage Sensing 
Relay
 Main Battery Charger 
Detection Relay
 Main Battery Charger Disable 
Relay
 Main Battery Relay 
Main Battery Transfer Relay 
Main/APU Battery Charger 
Detection Enable Relay
 Operation 
Function Description 
Component Location 
Component Index
 Component Location
 BATTERY - APU  24-31-03
 Removal/Installation 
BATTERY - MAIN  24-31-01
 Removal/Installation 
CHARGER - APU BATTERY  24-31-04
 Removal/Installation 
CHARGER - MAIN BATTERY  24-31-02
 Removal/Installation 
MONITOR - APU BATTERY CURRENT  24-31-07
 Removal/Installation 

[*] AIRPLANES WITH EXTENDED STANDBY POWER;
 MONITOR - MAIN BATTERY CURRENT 24-31-05 Removal/Installation RELAYS - MAIN BATTERY AND MAIN 24-31-06 BATTERY TRANSFER Removal/Installation
Page____ Effectivity
1 ALL
1
1
7

1
1
6
5
6

6
6
5
6
7

7
7
101 ALL

401 ALL
401 ALL
401 ALL
401 ALL
401 [*]
401 ALL
401 ALL

 24-CONTENTS

 GUN.1 Page 7 Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 CHAPTER 24 - ELECTRICAL POWER
 TABLE OF CONTENTS
_________________
 Subject
_______
SHUNT - MAIN BATTERY Removal/Installation TRANSFORMER - RECTIFIER
Description and Operation General Component Details
APU Start TRU Fan Control
Relay APU TRU Start Relay DC Tie Control Unit DC Tie Relay Transformer-Rectifier Units
Operation
Functional Description

Component Location Component Index Component Location
 RELAY - APU START TRU FAN CONTROL Removal/Installation RELAY - APU TRU START Removal/Installation RELAY - DC TIE Removal/Installation TRANSFORMER Removal/Installation TRU - APU START Removal/Installation UNIT - DC TIE CONTROL Removal/Installation
Chapter SectionSubject
24-31-09
24-32-00
24-32-06
24-32-0524-32-0224-32-0124-32-0424-32-03
Page
401
1 114
411144101
401
401
401
401
401
401
Effectivity
ALLALL
ALL
ALLALLALLALLALLALL

 24-CONTENTS

 GUN Page 8 May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 CHAPTER 24 - ELECTRICAL POWER
 TABLE OF CONTENTS
_________________
 Chapter Section
 Subject_______ Subject
STANDBY POWER 24-33-00
 Description and Operation
General
Component Details

AC and DC Standby Bus Off
Relays
 AC Standby Power Relay
APU Battery Charger

Detection Relay Battery Discharge Indication Inhibit Relay Extended Standby Power Indication Relay Main/APU Battery Tie Remote
Control Circuit Breaker Standby Power Control Panel Standby Power Relay Static Inverter
Operation
Functional Description

Component Location
Component Index
 Component Location

 Inspection/Check BREAKER - MAIN/APU BATTERY TIE 24-33-02 REMOTE CONTROL CIRCUIT Removal/Installation [*] AIRPLANES WITH EXTENDED STANDBY POWER
 INVERTER - STATIC 24-33-03 Removal/Installation PANEL - STANDBY POWER CONTROL 24-33-04 Removal/Installation RELAYS - STANDBY POWER 24-33-01 Removal/Installation DC METERS 24-34-00
 Description and Operation
General
Operation

Functional Description
EXTERNAL POWER 24-40-00
______________Page____ Effectivity
1 ALL
1
1
4

4
4
4
4
4
1
4
1
5
5

101 ALL
601 ALL
401 [*]
401 ALL
401 ALL
401 ALL
1 ALL
1
1
　
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