49-CONTENTS
GUN Page 13 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
_________________
Subject
_______
Component Location Component Index Component Location
COOLER - AIR-COOLED OIL Removal/Installation Cleaning/Painting
COOLER - FUEL-COOLED OIL
Removal/Installation
SYSTEM - APU OIL INDICATING
Description and Operation General Indicator - Oil Filter
Differential Pressure Sensor - Oil Level
Sensor - Oil Temperature Switch - Low Oil Pressure Operation
Component Location Component Index Component Location
INDICATOR - OIL FILTER DIFFERENTIAL PRESSURE Removal/Installation Inspection/Check
SENSOR - OIL LEVEL Removal/Installation
SENSOR - OIL TEMPERATURE Removal/Installation
SWITCH - LOW OIL PRESSURE Removal/Installation Chapter SectionSubject
49-91-01
49-91-0249-94-00
49-94-04
49-94-0349-94-0149-94-02Page
101
401 701
401
1 11
1111101
401 601
401
401
401 EffectivityALL
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ALL
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49-CONTENTS
GUN Page 14 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
AUXILIARY POWER UNIT - DESCRIPTION AND OPERATION
________________________________________________
1. General_______
A. Auxiliary Power Unit (APU) (Fig. 1)
(1)
The auxiliary power unit (APU) is a gas turbine engine which supplies electrical and pneumatic power to other airplane systems during airplane ground operations. The APU has a twin-spool turbine engine, two ac generators and automatic controls for a continuous operation. Each of the two ac generators can supply 90 kVA (152 hp) (total of 180 kVA (304 hp)) electrical power to the airplane electrical system (AMM 24-20-00/001). Pneumatic power is supplied by the APU load compressor to the airplane pneumatic system (AMM 36-11-00/001). The airplane pneumatic system supplies compressed air for airplane air conditioning, main engine starting and operation of the air-driven hydraulic pumps.
(2)
The location of the APU is in the tail section between station 2658 and station 2792. You get access to the APU in the APU compartment through the two APU access doors. The APU is attached to a vertical firewall and the airplane upper structure by two forward and one aft mounts. Three vibration isolator-type mounts (shockmounts) are used between the support structure and the APU to isolate the airplane from the APU vibrations (AMM 49-13-00/001).
(3)
The APU operational conditions are shown in table 1.
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49-11-00
ALL ú ú 01 Page 1 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
AIR INLET DOOR ACTUATOR
AIR INLET
AIR-COOLED
OIL COOLER
BRACE
DIVERTER VALVE CONTROL
RATE SENSOR
GENERATOR
FUEL FWDMANIFOLDS COOLING AIR
EXHAUST DUCT
EXHAUST
VERTICAL DUCT
SUPPORT
STARTER TUBE
MOTOR
ACCESSORY
FUEL-COOLED GEARBOX
OIL COOLER BRACE
IGNITION
EXCITER FUEL
PUMP
DIVERTER VALVE
PNEUMATIC DUCT
APU FIREWALL EXHAUST DUCT DRAIN
SUPPORT FUEL METERINGDIVERTER DUCT UNIT
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