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 SEAL - MAIN DRIVESHAFT OIL 49-27-02 Removal/Installation 401 ALL SEAL - OIL, AC GENERATOR DRIVE 49-27-05 Removal/Installation 401 ALL SEAL - OIL, SPUR GEARSHAFT, FUEL 49-27-06 PUMP DRIVE Removal/Installation 401 ALL
 ENGINE FUEL AND CONTROL 49-30-00
_______________________ SYSTEM - APU ENGINE FUEL 49-31-00
 Description and Operation 1 ALL General 1 Cooler - Fuel Cooled Oil 4 Manifolds and Nozzles - Fuel 4 Pump - Fuel 1 Unit - Fuel Metering 4 Valve - Flow Divider and Dump 4 Operation 4
 Component Location 101 ALL Component Index Component Location
 49-CONTENTS
 GUN Page 7 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 49 - AIRBORNE AUXILIARY POWER
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject
Maintenance Practices
General
Element Installation - Fuel

Pump Outlet Filter
 Element Removal - Fuel Pump
Outlet Filter
 Plug Installation - Fuel Pump

Cover
 Plug Removal - Fuel Pump Cover
Screen Cleaning - Fuel Pump

Inlet Screen Installation - Fuel Pump Inlet Screen Removal - Fuel Pump Inlet Valve Installation - Flow Divider and Dump Valve Removal - Flow Divider and Dump ADAPTER - FUEL METERING 49-31-02 Removal/Installation ADAPTERS - FUEL MANIFOLD AND 49-31-04 NOZZLE Removal/Installation
APU FUEL FILTER BYPASS INDICATOR 49-31-05 Removal/Installation Adjustment/Test
PUMP - FUEL 49-31-03 Removal/Installation UNIT - FUEL METERING 49-31-01 Removal/Installation
IGNITION/STARTING 49-40-00
_________________ 49-CONTENTS
Page____  Effectivity___________
201  ALL
201
211
209
216
214
207
203
201
221
219
401  ALL
401  ALL
401  ALL
501  ALL
401  ALL
401  ALL

 GUN Page 8 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 49 - AIRBORNE AUXILIARY POWER
 TABLE OF CONTENTS
_________________ Chapter
 Section
 Subject_______  Subject_______ 
SYSTEM - APU IGNITION AND STARTING  49-41-00
 Description and Operation 
General 
Battery - APU 
Exciter - Ignition 
Motor - Starter 
Plugs - Igniter 
Transformer Rectifier Unit -

APU Start
 Operation

Component Location Component Index Component Location
 BRUSH - STARTER MOTOR Inspection/Check
CABLE - IGNITION Removal/Installation Adjustment/Test
EXCITER - IGNITION Removal/Installation
MOTOR - STARTER Removal/Installation
PLUG - IGNITER Removal/Installation Inspection/Check Cleaning/Painting
AIR
___ SYSTEM - APU COOLING AIR Description and Operation General Fan - Cooling Operation Component Location Component Index Component Location
49-41-0249-41-05
49-41-0349-41-0149-41-04
49-50-0049-51-00Page____ Effectivity
1 ALL
1
1
1
1
5
1
5
101 ALL

601 ALL
401 ALL
501 ALL
401 ALL
401 ALL
401 ALL
601 ALL
701 ALL
1 ALL
1
1
1
101 ALL
 49-CONTENTS
 GUN Page 9 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 49 - AIRBORNE AUXILIARY POWER
 TABLE OF CONTENTS
_________________
 Chapter
 Section
 Subject_______  Subject_______ 
FAN - COOLING  49-51-02
 Removal/Installation 
SCREEN - COOLING AIR INLET  49-51-04
 Removal/Installation 
SYSTEM - APU DIVERTER AND IGV  49-52-00
 CONTROL
 Description and Operation 
General 
Actuator - Inlet Guide Vane 
Control - Diverter Valve 
Sensor - Rate 
Valve - Diverter 
Operation 
Component Location 
Component Index
 Component Location
 ACTUATOR - INLET GUIDE VANE  49-52-03
 Removal/Installation 
CONTROL - APU DIVERTER VALVE  49-52-06
 Removal/Installation 
ELEMENT - P3 AIR FILTER  49-52-08
 Removal/Installation 
Cleaning/Painting 
MUFFLER - DIVERTER VALVE  49-52-05
 Removal/Installation 
Cleaning/Painting 
　
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