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 HSPS CT/ NOV. 2006 © 2006 Hamilton Sundstrand Corporation  APS 3200 AUXILIARY POWER UNIT TRAINING COURSE (ECB SOFTWARE VERSION 6.0) LINE MAINTENANCE AND FAULT ISOLATION THIS HANDBOOK IS FOR REFERENCE PURPOSES ONLY. IF FAULT ISOLATION OR MAINTENANCE IS REQUIRED, REFER TO THE APPLICABLE MANUFACTURERS TECHNICAL MANUAL FOR SPECIFIC PROCEDURES Hamilton Sundstrand reserves the right to make changes in specifications and other information contained in this publication without prior notice NOTICE THIS TRAINING MANUAL IS TO BE USED FOR TRAINING PUPOSES ONLY This training manual was prepared by Hamilton Sundstrand for training purposes only. Some information contained herein is proprietary and/or copyrighted information of Hamilton Sundstrand. As a condit ion of, and as consideration for receiving this document, the recipient agrees that this document and the information contained therein shall not be disclosed outside the recipient or duplicated or used for any purpose without Hamilton Sundstrand’s prior written consent.
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  • HSPS CT/ NOV. 2006 2006 Hamilton Sundstrand Corporation

    APS 3200 AUXILIARY POWER UNIT

    TRAINING COURSE

    (ECB SOFTWARE VERSION 6.0)

    LINE MAINTENANCE AND FAULT ISOLATION

    THIS HANDBOOK IS FOR REFERENCE PURPOSES ONLY. IF FAULT ISOLATION OR MAINTENANCE IS REQUIRED, REFER TO THE APPLICABLE MANUFACTURERS TECHNICAL MANUAL

    FOR SPECIFIC PROCEDURES

    Hamilton Sundstrand reserves the right to make changes in specifications and other information contained in this publication without prior notice

    NOTICE

    THIS TRAINING MANUAL IS TO BE USED FOR TRAINING PUPOSES ONLY

    This training manual was prepared by Hamilton Sundstrand for training purposes only.Some information contained herein is proprietary and/or copyrighted information ofHamilton Sundstrand. As a condition of, and as consideration for receiving thisdocument, the recipient agrees that this document and the information containedtherein shall not be disclosed outside the recipient or duplicated or used for anypurpose without Hamilton Sundstrands prior written consent.

  • HSPS CT/NOV. 2006 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document

  • HSPS CT/NOV. 2006 HAMILTON SUNDSTRAND PROPRIETARY

    AIRBUS AIRCRAFT

    Use or disclosure of this data is subject to the Restriction on the title page of this document

  • HSPS CT/NOV. 2006 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    Use or disclosure of this data is subject to the Restriction on the title page of this document

  • HSPS CT/NOV. 2006 Page i HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 Auxiliary Power Unit

    Front Matter

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  • HSPS CT/NOV. 2006 Page ii HAMILTON SUNDSTRAND PROPRIETARY

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    TABLE OF CONTENTS

    SUBJECT PAGE

    Preface............................................................................................ iii

    Abbreviations ................................................................................. v

    APU Leading Particulars ............................................................... viii

    SUBJECT SECTION

    Introduction...................................................................................... 1

    Power Unit....................................................................................... 2

    Oil System....................................................................................... 3

    Fuel System .................................................................................... 4

    Air System....................................................................................... 5

    Control System................................................................................ 6

    Indicating System............................................................................ 7

    Starting System............................................................................... 8

    Electrical System............................................................................. 9

    APU Installation............................................................................. 10

    Maintenance.................................................................................. 11

    Fault Isolation ................................................................................ 12

    Troubleshooting............................................................................. 13

  • HSPS CT/ NOV. 2006 Page iii HAMILTON SUNDSTRAND PROPRIETARY

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    PREFACE

    GENERAL DESCRIPTION

    The APS 3200 Auxiliary Power Unit Maintenance Training Course, developed by the Customer Service Training Group of Hamilton Sundstrand Power Systems, is designed to give the student an understanding of the various components of the Auxiliary Power Unit (APU) and their functions. This course also provides routine maintenance and troubleshooting.

    STUDENT WORKBOOK

    This workbook is intended for the limited purpose of providing component familiarization, general data, and support information for this maintenance course.

    This is an uncontrolled document and will not be updated or revised on a regular basis. Specific values given in this document such as speed, temperature, and pressure are provided for the purpose of illustration and are not necessarily representative of the true values of the APS 3200 APU.

    FAA AND AIRCRAFT MANUFACTURER APPROVED PUBLICATIONS

    The Airline is provided a variety of FAA and Aircraft Manufacturer approved publications for the APS 3200 APU. These publications are:

    Aircraft Flight Crew Manuals

    Aircraft Maintenance Manuals

    Engine and Component Maintenance Manuals

    Service Bulletins

    Chapter 49 of the aircraft maintenance manual presents detailed APU and LRU removal and installation procedures plus maintenance and servicing techniques that can be accomplished at the flight-line. Careful study of Chapter 49 will add to the student's expertise in troubleshooting and maintaining the Hamilton Sundstrand APS 3200 APU.

  • AIRCRAFT APPLICATIONS

    The information presented in this course applies to the following aircraft:

    AIRBUS 318, 319, 320, 321

    HSPS CT/NOV. 2006 Page iv HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV. 2006 Page v HAMILTON SUNDSTRAND PROPRIETARY

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    LIST OF ABBREVIATIONS The abbreviations/symbols shown below are used in this manual: A/D Analog/Digital A/C Aircraft AC Alternating Current ACARS Aircraft Communication Addressing and Reporting System ACMS Aircraft Condition Monitoring System ADIRU Air Data Inertial Reference Unit AIDS Aircraft Integrated Data System APIC Auxiliary Power International Corp. APS Auxiliary Power System APU Auxiliary Power Unit ARINC Aeronautical Radio Inc. ATA Air Transport Association AVAIL APU Available BATT Battery BCV Bleed Control Valve BITE Built-In Test Equipment BMC Bleed Monitor Computer CB Circuit Breaker cc/h Cubic centimeters per hour CFDS Centralized Fault Display System CLR Clear

    CMM Components Maintenance Manual CPU Central Processor Unit D/A Digital/Analog DC Direct Current ECAM Electronic Centralized Aircraft Monitoring EC dB Decibel B Electronic Control Box ECS Environmental Control System EGT Exhaust Gas Temperature EMI Electro-Magnetic Interference EPLD Erasable Programmable Logic Device ETOPS Extended Twin Engine Operations FADEC Full Authority Digital Electronic Controller FAR Federal Airworthiness Regulation FCU Fuel Control Unit FET Field Effect Transistor FOD Foreign Object Damage ft Feet FWD Forward GBX Gearbox

  • HSPS CT/NOV. 2006 Page vi HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LIST OF ABBREVIATIONS GCU Generator Control Unit GMT Greenwich Mean Time GPH Gallons Per Hour HOT High Oil Temperature HP Horse Power HSPS Hamilton Sundstrand Power System Hz Hertz ICAO International Civil Aviation Organization ID Identification IGV Inlet Guide Vane IPC Illustrated Parts Catalogue ISA International Standard Atmosphere JAR Joint Airworthiness Requirement kg Kilogram kg/m Kilograms Per Minute kg/s Kilograms Per Second kHz Kilo Hertz kPa Kilopascal kPaa Kilopascals Absolute kPad Kilopascals Differential kPag Kilopascals Gauge kW Kilo Watt

    L Liter l/h Liters Per Hour lb Pound lbs/hr Pounds Per Hour lbs/m Pounds Per Minute lbs/sec. Pounds Per Second LC Load Compressor LOP Low Oil Pressure LP Low Pressure LRU Line Replaceable Unit LVDT Linear Voltage Differential Transducer m Meter mA Milliampere MAX Maximum MCDU Multi-function Control and Display Unit MES Main Engine Start MHz Mega Hertz P Qts Quarts MIN Minimum mm Millimeter MMEL Master Minimum Equipment List MTBF Mean Time Between Failure

  • HSPS CT/NOV. 2006 Page vii HAMILTON SUNDSTRAND PROPRIETARY

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    LIST OF ABBREVIATIONS SIG Pounds Per Square Inch Gauge MTBUR Mean Time Between Unscheduled Removals mV Millivolt N Rotation Speed NGV Nozzle Guide Vane NVM Non Memory Volatile VAC Volts, Alternating Current

    OAP Outside Air Pressure OAT Outside Air Temperature OBRM On Board Replaceable Memory P/N Part Number PCD Pressure Compressor Discharge PMG Permanent Magnet Generator PS Power Section PSIA Pounds Per Square Inch Absolute PSID Pounds Per Square Inch Differential RAM Random Access Memory ROM Read Only Memory RPM Revolutions Per Minute RTD Resistive Temperature Device S Seconds S/N Serial Number SSLC Single Shaft Load Compressor STS Status

    THR Threshold TRU Transformer Rectifier Unit TSO Technical Standard Order US G US Gallon

    VDC Volts, Direct Current C Degrees Celsius F Degrees Fahrenheit > Is Greater Than < Is Less Than Plus or Minus Ohm Differential % Percent

  • HSPS CT/ NOV. 2006 Page viii HAMILTON SUNDSTRAND PROPRIETARY

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    APU LEADING PARTICULARS

    WEIGHT 136 Kg (299 lbs) (dry)

    OPERATING ALTITUDE -304.8 M to 11,887 M (-1,000 to 39,000 ft)

    SEA LEVEL 15C (59F) STD DAY PERFORMANCE

    OUTPUT SHAFT HORSEPOWER 399.7 Kw (536 HP)

    ROTOR SPEED 100% (49,300 RPM)

    ROTOR OVERSPEED (SHUTDOWN) 105% (51,765 RPM)

    BACK UP OVERSPEED (SHUTDOWN) 107% (52,751 RPM)

    ROTOR UNDERSPEED (SHUTDOWN) 95% (46,835 RPM)

    BLEED AIRFLOW 1.8 kg/SEC (2.6 LBS/SEC)

    BLEED AIR PRESSURE 290 kPag (42 PSIG)

    FUEL CONSUMPTION 148 kg/HR (178 L/HR) [327 LB/HR (47 GAL/HR)]

  • HSPS CT/NOV. 2006 Page ix HAMILTON SUNDSTRAND PROPRIETARY

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    APU LEADING PARTICULARS

    EXHAUST GAS TEMPERATURE (SHUTDOWN)

    START % SPEED EXHAUST GAS TEMPERATURE

    0% 427C (800F)

    10% 788C (1450F)

    20% 899C (1650F)

    30% 899C (1650F)

    50% 853C (1567F)

    80% 788C (1450F)

    100% 670C (1238F)

    RUN % SPEED EXHAUST GAS TEMPERATURE

    100% 722C (1332F)

  • HSPS CT/NOV. 2006 Page x HAMILTON SUNDSTRAND PROPRIETARY

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    APU LEADING PARTICULARS

    GEARBOX SPEEDS Input 49,300 RPM Generator 24,034 RPM (output) Fuel Control 10,129 RPM (output) Starter 32,045 RPM (output) Cooling Fan 51,965 RPM (output) Oil Pump 4,137 RPM (output)

    OIL PRESSURE 241 kPag (35 PSIG) (minimum) 345-414 kPag (50-60 PSIG) (normal)

    OIL CAPACITY 3.9 L (4.16 Qts) (add) 5.4 L (5.72 Qts) (full)

    OIL TEMPERATURE (SHUT DOWN) 135C (275F) Lubrication system 185C (365F) AC Generator

    APPROVED OIL SPECIFICATION:

    MIL-PRF-7808

    MIL-PRF-23699

    CAUTION:

    DO NOT MIX OR SUBSTITUTE OIL SPECIFICATIONS. USE ONLY ONE OF THE APPROVED OILS. IF THE OIL SUPPLY IS LOW AND THE OIL BEING USED IS NOT AVAILABLE, DRAIN THE OIL SUMP AND CHANGE THE OIL FILTER. SERVICE THE OIL SYSTEM WITH AN APPROVED OIL.

  • HSPS CT/NOV. 2006 Page xi

    HAMILTON SUNDSTRAND PROPRIETARY

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    APU LEADING PARTICULARS

    APPROVED FUELS

    Fuel Type Specification Temperature Range

    Jet A ATSM D1655 (NATO Code F-35) -35C (-30F) to +57C (+135F) Jet A-1 ATSM D1655 (NATO Code F-35) -43C (-45F) to +57C (+135F) Jet B ATSM D1655 (NATO Code F-45) -54C (-65F) to +57C (+135F) JP-4 MIL-T-5624 (NATO Code F-40) -54C (-65F) to +57C (+135F) JP-5 MIL-T-5624 (NATO Code F-44) -35C (-30F) to +93C (+ 200F) JP-8 MIL-T-83133 (NATO Code F-34) -35C (-30F) to +93C (+ 200F)

  • HSPS CT/NOV. 2006 Page xii HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    Use or disclosure of this data is subject to the restriction on the title page of this document

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    HSPS CT/NOV. 2006 Page 1.0 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    SECTION 1

    INTRODUCTION

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV.. 2006 Page 1.1 HAMILTON SUNDSTRAND PROPRIETARY

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    APS 3200- GENERAL PRESENTATION

    Function

    The APS 3200 is designed to provide compressed air and electrical power to the aircraft on the ground and in flight.

    - Electrical power supply to aircraft systems

    - Compressed air supply to aircraft systems:

    Environmental Control System (ECS) Main Engine Start (MES) Various systems...

    Requirements

    Regulations: - JAR part 25, change 13 - FAR part 25

    Certification: - JAR APU change 2

    Main Components The main components are:

    - The Auxiliary Power Unit (APU)

    - The Electronic Control Box (ECB)

    - The aircraft systems (Pneumatic system, Electrical system, Control panels).

    The APU is a single spool gas turbine engine which drives a load compressor and an AC generator.

    The ECB is an electronic controller, FADEC type (Full Authority Digital Electronic Control). Component Location

    - The APU is installed in the tail section of the aircraft.

    - The ECB is installed in the aft cargo compartment, right side, forward of the cargo door.

    Control and Display

    - On the overhead panel for APU operation and fire control

    On the ECAM (Electronic Centralized Aircraft Monitoring) for APU parameters display

    On the external panel, under the nose section, for APU emergency -shut-down

  • HSPS CT/NOV.. 2006 Page 1.2 HAMILTON SUNDSTRAND PROPRIETARY

    .

    AUXILIARY POWER UNIT

    CONTROL AND DISPLAY PANELS

    ELECTRONIC CONTROL BOX (AFT CARGO COMPARTMENT)

    AIRBUS AIRCRAFT

    Use or disclosure of this data is subject to the restriction on the title page of this document.

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    HSPS CT/NOV. 2006 Page 1.3 HAMILTON SUNDSTRAND PROPRIETARY

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    APS 3200 - DESCRIPTION (1)Power Unit

    The APU consists of a gas turbine engine (Power Section) which drives:

    - A load compressor

    - And an AC generator (alternator) through a gearbox.

    The APU is of modular design. It has three modules:

    - The power section

    - The load compressor

    - The gearbox.

    A common air inlet supplies the load compressor, the cooling fan and the power section.

    Power Section

    The power section is a single spool gas turbine engine which consists of:

    - A centrifugal compressor

    - A reverse flow combustor chamber

    - A two stage axial flow turbine.

    Load Compressor

    The load compressor is a single stage centrifugal compressor driven directly by the power section. Variable inlet guide vanes are used for airflow and exhaust gas temperature control.

    Gearbox

    The gearbox, also driven by the power section, is attached to the load compressor. The gearbox provides the drive at the correct speed for the AC generator and the APU mechanically driven accessories.

    Electronic Control Box

    The ECB provides control and monitoring of the APU and is located in the aircraft rear cargo compartment.

  • .

    HSPS CT/NOV. 2006 Page 1.4 HAMILTON SUNDSTRAND PROPRIETARY

    COMBUSTOR

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    AC GENERATOR

    GEARBOX

    LOAD COMPRESSOR

    IMPELLER

    TURBINES

    APS 3200 DESCRIPTION (1)

  • .

    HSPS CT/NOV. 2006 Page 1.5 HAMILTON SUNDSTRAND PROPRIETARY

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    APS 3200 DESCRIPTION (2) - The APU air inlet plenum is connected to the aircraft air intake

    system.

    The APU air inlet plenum has a screen to protect the APU internal components from foreign object damage.

    - The cooling fan assembly is located at the top of the gearbox front face.

    - The starter motor drives the APU rotor assembly during starting.

    The starter motor is located on the front face of the gearbox.

    - The fuel control unit supplies and meters fuel to the APU. It is located on the gearbox front face.

    - The load compressor scroll houses the load compressor impeller.

    - The air inlet plenum delivers air to the impellers.

    The air inlet plenum is located between the load compressor and the power section.

    - The ignition exciter supplies high energy electrical power to the ignitor plugs.

    The ignition exciter is mounted on the left side of the air inlet plenum.

    - The oil cooler transfers the heat of the lubricating oil to the cooling air supplied by the cooling fan assembly.

    - The APU exhaust system delivers the APU exhaust gases to the aircraft exhaust pipe.

  • HSPS CT/NOV.. 2006 Page 1.6 HAMILTON SUNDSTRAND PROPRIETARY

    COOLING FAN ASSEMBLY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    APS 3200 - DESCRIPTION (2)

    AIR BYPASS PLENUM

    OIL COOLER

    AIR INLET PLENUM

    EXCITER

    LOAD COMPRESSOR SCROLL

    APU AIR INLET

    FUEL CONTROL UNIT

    STARTER MOTOR

  • HSPS CT/NOV.. 2006 Page 1.7 HAMILTON SUNDSTRAND PROPRIETARY

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    APS 3200 - DESCRIPTION (3) Identification of Components

    - The gearbox provides the drive for the AC generator and the accessories for APU operation.

    The gearbox also provides the sump for the oil system.

    - The AC generator that provides electrical power for the aircraft systems.

    - The cooling fan assembly for airflow through the oil cooler and ventilation of the APU compartment.

    The cooling fan assembly is located on the gearbox front face.

    - The APU drain collector. The collector is installed on the right side of the gearbox by two struts.

    - The air- bleed system that includes a servo valve, an actuator, and a bleed control valve.

    - The inlet guide vane system that includes a servo valve, an actuator, the inlet guide vanes and their control mechanism.

    - The combustor housing that houses the combustor chamber.

    - Main and pilot fuel injection system installed on the combustor housing.

  • .

    HSPS CT/NOV. 2006 Page 1.8 HAMILTON SUNDSTRAND PROPRIETARY

    MAIN AND PILOT

    FUEL INJECTION SYSTEM

    COOLING FAN ASSEMBLY

    INLET GUIDE VANE ACTUATOR

    BLEED CONTROL VALVE

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    APS 3200 DESCRIPTION (3)

    APU DRAIN COLLECTOR

    GEARBOX

    AC GENERATOR MOUNTING PAD

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    HSPS CT/NOV. 2006 Page 1.9 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 - OPERATION Power section provides the shaft power to drive the load compressor and the gearbox.

    Power is produced by transforming the energy contained in the ambient air and the fuel through thermodynamic cycle: compression, combustion, expansion.

    - Compression of the air in the single stage centrifugal compressor

    - Combustion of the air-fuel mixture in the reverse flow combustor chamber

    - Expansion of the burned gases across the two stage axial flow

    turbine to drive:

    The power section impeller

    The load compressor impeller

    The gearbox.

    The load compressor supplies compressed air to the aircraft pneumatic system. The air is compressed by a single stage centrifugal impeller and uses variable inlet guide vanes to control the air flow. The compressed air is delivered through a scroll to the bleed control valve.

    The gearbox provides the drive for the AC generator, and accessories for APU operation.

    The AC generator that provides electrical power for the aircraft systems.

    The Electronic Control Box receives various signals from the aircraft and the APU to operate and monitor the APU.

    The electronic control box controls the following:

    - Rotation speed (N) (fuel flow)

    - Load compressor surge protection (bleed control valve)

    - Exhaust Gas Temperature (EGT) (inlet guide vanes).

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV.. 2006 Page 1.10 HAMILTON SUNDSTRAND PROPRIETARY

    TO AIRCRAFT

    TO APU EXHAUST

    POWER SECTION

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    APS 3200 - OPERATION

    ECB

    BLEED CONTROL VALVE

    COMPRESSION COMBUSTION EXPANSION

    GENERATOR

    AMBIENT AIR COMPRESSED AIR COMBUSTION EXHAUST FUEL FLOW ELECTRICAL SIGNALS

    IGV ACTUATOR FUEL CONTROL

    EXHAUST

    GEARBOX

    LOAD COMPRESSOR

  • HSPS CT/NOV. 2006 Page 1.11 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    Use or disclosure of this data is subject to the restriction on the title page of this document

  • HSPS CT/NOV..2006 Page 2.0 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    SECTION 2

    POWER UNIT

    Use or disclosure of this data is subject to the restriction on the title page of this document.

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    HSPS CT/NOV. 2006 Page 2.1 HAMILTON SUNDSTRAND PROPRIETARY

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    POWER UNIT - GENERAL

    Function

    The APU provides compressed air and electrical power to the aircraft.

    Location

    The APU is installed in the aircraft tail section.

    Type

    Single spool gas turbine engine driving a load compressor and an AC generator.

    Main Characteristics

    Characteristics at Aero Design Point, installed APU (ISA, sea level) are given for information only:

    - Total power ............................400 kW (536 HP)

    - Specific fuel consumption .......0.372 kg/kW.h (0.61 Ib/HP.H)

    - Fuel consumption ...................148 kg/HR (178 L/HR) ................................................[327 LB/HR (47 GAL/HR)]

    - Electrical power ......................132 kW (177 HP)

    - Pneumatic power ...................252 kW (338 HP)

    - Bleed air flow .........................1.2 kg/sec. (2.6 lbs/sec.)

    - Bleed air pressure ..................390 kPa (42 PSI)

    - Rotation speed .......................49 300 RPM

    - Direction of rotation ................clockwise (view from the rear)

    - APU dry weight ......................136 kg (299 lbs).

    Main Components

    - Gearbox (with AC generator and APU accessory drive)

    - Load compressor (centrifugal type provided with inlet guide vanes)

    - Air inlet plenum (air intake and air distribution)

    - Power section including:

    A centrifugal impeller

    A reverse flow combustor chamber

    A two stage axial flow turbine.

  • HSPS CT/NOV..2006 Page 2.2 HAMILTON SUNDSTRAND PROPRIETARY

    LOAD COMPRESSOR

    CENTRIFUGAL COMPRESSOR

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    POWER UNIT - GENERAL

    GEARBOX AIR INLET PLENUM

    TURBINES

    AC GENERATOR

    COMBUSTOR CHAMBER

    ECB

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    HSPS CT/NOV. 2006 Page 2.3 HAMILTON SUNDSTRAND PROPRIETARY

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    POWER UNIT - DESCRIPTION (1)

    The first part of the description deals with the APU rotating assembly and the second part will consider the modular design of the APU.

    The following main components are considered in this description: gearbox, air intake plenum, load compressor and power section.

    Gearbox

    The gearbox located at the front of the APU provides the mechanical drive for the AC generator and the accessories required for the APU operation. The oil sump is also part of the gearbox.

    Load Compressor

    The load compressor is driven by the power section and provides compressed air to the aircraft pneumatic system. It is a centrifugal impeller that has variable inlet guide vanes to control the air flow output.

    Air Inlet Plenum

    The plenum is located between the load compressor and the power section. The plenum directs the air supply to the power section, load compressor and the oil cooling system.

    Power Section

    The power section provides mechanical shaft power to drive the load compressor and the gearbox.

    The power section comprises:

    - A single stage centrifugal impeller

    - A reverse flow combustion chamber

    - A two stage axial flow turbine

    - An exhaust system.

    The main rotor assembly is supported by two bearings: A ball bearing at the front of the load compressor, a roller bearing at the rear of the turbine.

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    HSPS CT/NOV. 2006 Page 2.4 HAMILTON SUNDSTRAND PROPRIETARY

    DRIVE TRAIN FOR AC GENERATOR AND APU ACCESSORIES CENTRIFUGAL IMPELLER COMBUSTION

    CHAMBER FRONT BEARING EXHAUST

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER UNIT - DESCRIPTION (1)

    OIL SUMP

    CENTRIFUGAL IMPELLER AIR INLET

    PLENUM TURBINES

    REAR BEARING

    VARIABLE INLET GUIDE VANES

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    HSPS CT/NOV. 2006 Page 2.5 HAMILTON SUNDSTRAND PROPRIETARY

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    POWER UNIT DESCRIPTION (2)

    APU Rotating Assembly

    The APU rotating assembly includes the following components:

    - The load compressor impeller

    - The inter shaft which connects the load compressor impeller to the power section rotor assembly

    - The compressor impeller of the power section

    - The turbine wheels.

    The tie-bolt secures the main components of the APU rotor assembly.

    Bearings

    The APU rotor assembly is supported by two bearings:

    - Front ball bearing

    - Rear roller bearing

    Quill Shaft

    The quill shaft is splined into the rotor shaft and provides the mechanical connection between the APU rotor shaft and the gearbox.

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    HSPS CT/NOV. 2006 Page 2.6 HAMILTON SUNDSTRAND PROPRIETARY

    POWER SECTION IMPELLER LOAD COMPRESSOR

    IMPELLER

    FRONT BALL BEARING

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER UNIT - DESCRIPTION (2)

    QUILL SHAFT

    INTER SHAFT TIE

    BOLT

    SECURING NUT

    TURBINES

    REAR ROLLER BEARING

    SECURING NUT

    A320-457a

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    HSPS CT/NOV. 2006 Page 2.7 HAMILTON SUNDSTRAND PROPRIETARY

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    POWER UNIT - OPERATION

    General

    The power section produces mechanical shaft power for APU operation.

    This mechanical power is used to drive:

    - The load compressor which supplies compressed air

    - The AC generator which supplies electrical power

    - Accessories required for the operation of the APU.

    Power Section Operation

    The air enters the power section through the aircraft air inlet and the APU plenum.

    In the plenum, this air is divided into two flows; one for the load compressor and one for the power section.

    The power section air is directed to the centrifugal impeller which increases the air pressure.

    The air is then admitted to the combustion chamber, mixed with the fuel and burned to provide a continuous combustion process. The gases are expanded across the turbines that transforms the gas energy into mechanical energy.

    The gases are then expelled overboard through the aircraft exhaust system.

    Load Compressor Operation

    The load compressor is driven by the power section and produces air flow to the aircraft pneumatic systems.

    Gearbox Operation

    The gearbox is driven by the power section to operate the APU accessories and the AC generator.

    Electronic Control Box (ECB)

    The ECB provides control and monitoring of the APU.

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    HSPS CT/NOV. 2006 Page 2.8 HAMILTON SUNDSTRAND PROPRIETARY

    BLEED CONTROL VALVE

    COMPRESSED AIR TO EXHAUST COMPRESSED

    AIR TO AIRCRAFT

    AC GENERATOR

    ECB AMBIENT AIR COMPRESSED AIR COMBUSTION EXHAUST

    POWER UNIT - OPERATION

    Use or disclosure of this data is subject to the restriction on the title page of this document. A320-458a

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    HSPS CT/NOV. 2006 Page 2.9 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - GENERAL

    Location

    The gearbox is located at the front of the load compressor scroll.

    Main Features

    - Modular design

    - Mechanical efficiency: 0.98

    - Weight: 17 kg (37.4 lbs)

    - Oil sump

    - Gearbox drive power: 148 kW (198 HP)

    - AC generator drive power: 132 kW (177 HP)

    - Accessories drive power: 16 kW (21 HP)

    - Material for housing: Aluminum alloy.

    Gearbox Front Face View

    - Oil cooling fan drive pad

    - AC generator drive pad

    - Starter motor drive pad

    - Fuel control unit drive pad

    - Accessories (oil filters, oil level sensor, de-oiling valve...).

    Gearbox Left Side View

    - Oil sight glass

    - Oil fill tube

    - High oil temperature sensor

    - Speed sensor

    - Gearbox mounting flange (attachment with the load compressor scroll)

    - APU front left mount.

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    HSPS CT/NOV. 2006 Page 2.10 HAMILTON SUNDSTRAND PROPRIETARY

    COOLING FAN DRIVE PAD

    MOUNTING FLANGE AC GENERATOR

    DRIVE PAD

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - GENERAL

    APU FRONT MOUNT

    FWD

    OIL FILL TUBE

    OIL SIGHT GLASS

    HIGH OIL TEMPERATURE

    SPEED SENSOR

    DE-OILING VALVE

    OIL LEVEL SENSOR

    OIL FILTERS

    STARTER MOTOR DRIVE PAD

    FUEL CONTROL UNIT DRIVE PAD

    DE-OILING VALVE

    A320-459a

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    HSPS CT/NOV. 2006 Page 2.11 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX DESCRIPTIO (1)

    This description considers the gears, the bearings and the drive pads.

    Gears

    The gearbox comprises of 8 spur type gears made of steel alloy. The gear train provides the correct speeds for the APU driven units. Bearings The gears are supported by bearings: 6 roller bearings and 6 ball bearings. AC Generator Drive - Speed: 24034 RPM - Direction of rotation: Clockwise. Intermediate Gear - Speed: 14349 RPM - Direction of rotation: Clockwise - Centrifugal air-oil separator. Cooling Fan Drive - Speed: 51965 RPM - Direction of rotation: Anti clockwise - PMG (Permanent Magnet Generator).

    Starter Motor Drive - Speed: 32045 RPM - Direction of rotation: Anti clockwise - Starter clutch: Sprag type. Fuel Pump Drive - Speed: 10129 RPM -Direction of rotation: Clockwise. Oil Pump Drives - Lubrication pump

    Speed: 4137 RPM Direction of rotation: Clockwise.

    Scavenge pumps Speed: 4137 RPM

    Direction of rotation: Anti clockwise.

    Note: Direction of rotation by viewing the front of the gearbox.

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    HSPS CT/NOV. 2006 Page 2.12 HAMILTON SUNDSTRAND PROPRIETARY

    -

    FRONT VIEW COOLING FAN DRIVE (51965 RPM)

    INTERMEDIATE GEAR (14349 RPM)

    STARTER MOTOR DRIVE (32045 RPM) AC GENERATOR DRIVE

    (24034 RPM)

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - DESCRIPTION (1)

    DRIVE GEAR (49300 RPM)

    FUEL PUMP DRIVE (10129 RPM)

    OIL PUMP DRIVES (4137 RPM)

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    HSPS CT/NOV. 2006 Page 2.13 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - DESCRIPTION (2)

    Identification of Gearbox Components

    - The gearbox housing which forms the oil sump and provides the accessories for the oil system (oil filter, oil level sensor, magnetic plug...).

    The gearbox housing also provides the mounting pads for:

    The oil cooling fan

    The AC generator

    The starter motor

    The fuel control unit

    The gearbox housing is attached to the load compressor scroll by a mounting flange.

    - The APU front left and right mounts are located on the sides of the gearbox.

    - The gearbox gear train which includes:

    The AC generator drive gear

    The intermediate gear, which also forms the air-oil separator

    The starter motor drive gear

    The fuel control unit drive gear

    The oil pump drive gears.

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    HSPS CT/NOV. 2006 Page 2.14 HAMILTON SUNDSTRAND PROPRIETARY

    INTERMEDIATE GEAR AC GENERATOR

    DRIVE GEAR

    STARTER MOTOR DRIVE GEAR

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - DESCRIPTION (2)

    DRIVE GEAR

    FUEL CONTROL UNIT DRIVE GEAR

    OIL PUMP DRIVE GEARS GEARBOX GEAR TRAIN

    A320-461a

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    HSPS CT/NOV. 2006 Page 2.15 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - OPERATION

    During Starting

    The starter motor is electrically energized and provides the torque to crank the gear train and the APU rotor assembly.

    At self-sustaining speed, the electrical supply to the starter is de-energized and the starter is disengaged by the sprag clutch.

    Normal Running Condition

    The power section provides the mechanical power to drive the load compressor and the gearbox drive gear.

    The drive gear meshes directly with the AC generator gear.

    It also drives an intermediate gear which in turn drives the oil cooler fan gear, the starter motor gear and the fuel control unit and oil pump gears

  • HSPS CT/NOV..2006 Page 2.16 HAMILTON SUNDSTRAND PROPRIETARY

    AC GENERATOR DRIVE

    COOLING FAN GEAR

    DRIVE GEAR INTERMEDIATE

    GEAR

    DRIVEN GEAR STARTER

    DRIVE GEARFUEL CONTROL UNIT DRIVE GEAR

    DRIVE GEAR

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    GEARBOX - OPERATION

    RUN OPERATION OIL PUMP DRIVE GEARS

    START OPERATION

    A320-461a

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    HSPS CT/NOV. 2006 Page 2.17 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    AIR INLET PLENUM - GENERAL

    Location

    The inlet plenum is located between the load compressor and the power section.

    Main Features

    - Acoustically treated part

    - Shop replaceable unit

    - Weight: approx. 7.5 kg (16.5 lbs).

    Main Components

    The plenum consists of two parts, upper and lower, which are connected by quick disconnect latches.

    The lower part interfaces with the aircraft air inlet system. The air inlet to the plenum is provided with a screen made of stainless steel that protects the APU internal components from foreign object damage.

    The upper part has an outlet for air supply to the oil cooling system (supply to the oil cooler fan).

    Construction

    The plenum is of sandwich construction with a structural envelope, Nomex and felt metal. The structural envelope and Nomex are fire proof.

    Operation

    In the plenum, the air is separated into two flows by the splitter.

    - One for the power section: 2.2 kg/s (4.8 lbs/sec.)

    - One for the load compressor and cooling fan: 1.2 kg/s (2.6 lbs/sec.).

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    HSPS CT/NOV. 2006 Page 2.18 HAMILTON SUNDSTRAND PROPRIETARY

    COOLING FAN AIR SUPPLY

    QUICK DISCONNECT LATCHES

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    AIR INLET PLENUM - GENERAL

    LOAD COMPRESSOR IMPELLER SPLITTER SCREEN

    AMBIENT AIR COMPRESSED AIR

    A320-463a

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    HSPS CT/NOV. 2006 Page 2.19 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    AIR INLET PLENUM - DESCRIPTION

    Identification of the Air Inlet Plenum Components

    - The lower part of the air inlet plenum interfaces with the APU air inlet system. It has a screen to protect the APU internal components from foreign object damage.

    The lower part incorporates noise treatment and a splitter which separates the air into two flows. It also provides the support for the following components:

    The ambient air pressure and temperature sensors

    The differential pressure sensor

    The low oil pressure switch

    The ignition exciter.

    - The upper part of the air inlet plenum is also noise treated.

    The upper part has an oval outlet to supply air to the oil cooling system

    - The quick disconnect latches secure the upper part and lower part of the air inlet plenum.

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    HSPS CT/NOV. 2006 Page 2.20 HAMILTON SUNDSTRAND PROPRIETARY

    PLENUM UPPER PART

    SPLITTER

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    AIR INLET PLENUM - DESCRIPTION

    A320-464a

    AIR INLET HOUSING

    PLENUM LOWER PART

    QUICK DISCONNECT LATCH

    COOLING FAN AIR SUPPLY

    INLET SCREEN LOCATING

    TAB

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    HSPS CT/NOV. 2006 Page 2.21 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - GENERAL

    Location

    The load compressor is installed between the gearbox and the power section.

    Type

    High pressure centrifugal impeller provided with inlet guide vanes.

    Main Features

    - Air flow: 1.2 kg/s (2.6 lbs/sec.)

    - Pressure ratio: 4:1

    - Max outlet temperature: 232C (450F)

    - Rotation speed: 49 300 RPM

    - Direction of rotation: clockwise (viewed from the rear of the APU).

    Main Components

    - Rotating components (compressor shaft, impeller, bearing, bearing seals)

    - Stationary components (air inlet housing, variable inlet guide vanes, impeller shroud, diffuser, and scroll).

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    HSPS CT/NOV. 2006 Page 2.22 HAMILTON SUNDSTRAND PROPRIETARY

    BLEED CONTROL VALVE

    COMPRESSED AIR TO AIRCRAFT

    COMPRESSED AIR TO EXHAUST

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - GENERAL

    INLET GUIDE VANES

    COMPRESSOR IMPELLER

    SCROLL

    AMBIENT AIR COMPRESSED AIR

    A320-465a

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    HSPS CT/NOV. 2006 Page 2.23 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - DESCRIPTION (1)

    The first part of this description deals with the load compressor components, the second part will consider the inlet guide vanes control mechanism and the third part the identification of all the components.

    Air Inlet Housing

    The housing allows the passage of air to the load compressor and supports the inlet guide vanes. It is made of aluminum alloy.

    Compressor Impeller

    The impeller is constructed of titanium alloy. The rear shaft of the impeller is connected to the rotor intershaft using a curvic coupling. The front is supported by a ball bearing.

    Compressor Shroud

    The shroud houses the impeller and is constructed of steel alloy.

    Compressor Diffuser

    It consists of 19 cambered vanes made of steel alloy.

    Scroll

    The annular scroll provides the air outlet of the load compressor. It is cast aluminum.

    The scroll housing provides passages for static air pressure to the load compressor discharge pressure sensor.

    Bearing

    A ball thrust bearing supports the front shaft of the load compressor. It is mounted in the load compressor housing.

    Bearing Seals

    Oil that is used to lubricate the front bearing is prevented from entering the impeller area by a floating carbon seal and a labyrinth seal.

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    HSPS CT/NOV. 2006 Page 2.24 HAMILTON SUNDSTRAND PROPRIETARY

    COMPRESSOR DIFFUSER DRAIN SQUEEZE

    FILM THRUST WASHER

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - DESCRIPTION (1)

    COMPRESSOR SHROUD

    INLET GUIDE VANE

    A320-450a

    COMPRESSOR IMPELLER

    BALL BEARING FLOATING

    CARBON SEAL

    LABYRINTH SEAL

    AMBIENT AIR COMPRESSD AIR

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    HSPS CT/NOV. 2006 Page 2.25 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - DESCRIPTION (2)

    Identification of Load Compressor Components

    - The IGV assembly includes the variable inlet guide vanes, the rack and pinion mechanism and the air inlet housing

    - The compressor shroud houses the impeller.

    - The load compressor impeller has main blades and splitter blades. The impeller is connected at the rear to the inter shaft by curvic-coupling. The impeller front shaft is supported by the front bearing.

    - The scroll provides the air outlet of the load compressor. The scroll also houses the load compressor diffuser.

    - The front bearing is a ball bearing that supports the impeller front shaft

    - The labyrinth seal is pressurized with compressed air from the power section impeller.

    - The front bearing nut retains the front bearing and forms the phonic wheel of the speed sensing system

    - The tie-bolt and the securing nut.

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    HSPS CT/NOV. 2006 Page 2.26 HAMILTON SUNDSTRAND PROPRIETARY

    SCROLL

    LABYRINTH SEAL

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - DESCRIPTION (2)

    FRONT BEARING

    FRONT BEARING JOURNAL

    TIE BOLT SECURING

    NUT

    FRONT BEARING NUT (PHONIC WHEEL)

    INLET GUIDE VANE ASSEMBLY

    COMPRESSOR SHROUD

    LOAD COMPRESSOR IMPELLER

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    HSPS CT/NOV. 2006 Page 2.27 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - DESCRIPTION (3)

    Inlet Guide Vanes

    The Inlet Guide Vanes (IGV) consist of 24 vanes, made of titanium alloy and mounted in the inlet housing.

    Each inlet guide vane has a sector gear.

    There are five guide vanes with holes in them. Three are located at the 6:30 position, one at the ten oclock and one at the two oclock position. The holes allow a minimum amount of air flow to the load compressor to prevent surging when the guide vanes are closed and the APU is operating.

    Control Mechanism

    The mechanism controls the position of the vanes. The complete mechanism consists of:

    - The actuator

    - The control rod

    - The rack and pinion mechanism that moves the vanes.

    The Actuator

    The actuator is hydraulically operated. It uses fuel pressure metered by an electrical signal from the electronic control box.

    The Control Rod

    The control rod is mechanically operated by the actuator.

    The control rod is connected between the actuator and the inlet guide vane assembly.

    The Inlet Guide Vane Assembly

    The inlet guide vane assembly consists of 24 sector gears engaged into a common ring gear.

    The ring gear is connected to the inlet guide vane control rod.

  • HSPS CT/NOV..2006 Page 2.28 HAMILTON SUNDSTRAND PROPRIETARY

    ACTUATOR ROD HOUSING AIR INLET

    HOUSING

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    INLET GUIDE VANE CONTROL ROD

    INLET GUIDE VANE ASSEMBLY

    RING GEAR

    IGV POSITION INDICATOR

    INLET GUIDE VANE

    SECTOR GEAR

    LOAD COMPRESSOR DESCRIPTION (3)

    A320-467A

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    HSPS CT/NOV. 2006 Page 2.29 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - OPERATION

    Air Inlet

    The ambient air enters the APU through the aircraft air inlet and the APU plenum.

    The plenum air is separated into three flows:

    - Air for the power section

    - Air for the oil cooling system

    - Air for the load compressor.

    The air for the load compressor passes through the inlet guide vanes; the flow of air depends upon the position (the angle) of the vanes. The air is then directed to the blades of the compressor impeller.

    Compression

    As the air enters the blades of the rotating compressor impeller the air velocity increases.

    The air leaves the tip of the blades at high velocity and flows through the diffuser vanes where velocity is transformed into pressure.

    Delivery

    The compressed air then flows into the scroll and delivered to the pneumatic system through a bleed control valve.

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    HSPS CT/NOV. 2006 Page 2.30 HAMILTON SUNDSTRAND PROPRIETARY

    COMPRESSED AIR TO EXHAUST

    COMPRESSED AIR TO AIRCRAFT

    SCROLL

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    LOAD COMPRESSOR - OPERATION

    DIFFUSER VANE

    COMPRESSOR IMPELLER INLET GUIDE

    VANES

    A320-468a

    AMBIENT AIR COMPRESSED AIR

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    HSPS CT/NOV. 2006 Page 2.31 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - GENERAL

    Function

    The power section provides the power to drive the load compressor and the gearbox.

    Location

    The power section forms the rear part of the APU.

    Type

    Single spool gas turbine engine.

    Main Components

    The main functional components are:

    - Single stage centrifugal impeller

    - Reverse flow combustion chamber

    - Two stage axial flow turbine

    - Exhaust.

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    HSPS CT/NOV. 2006 Page 2.32 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - GENERAL

    TWO STAGE AXIAL FLOW TURBINES SINGLE STAGE

    CENTRIFUGAL COMPRESSOR

    MAIN CHARACTERISTICS

    POWER 400 Kw (536 HP)

    SPECIFIC FUEL CONSUMPTION

    0.372 kg/kW.h (0.61 lb/HP.H)

    FUEL CONSUMPTION 327 LB/HR (47GAL/HR)

    ROTATION SPEED

    49300 RPM

    AIR MASS FLOW 2.2 kg/s (4.8 lbs/sec)

    COMPRESSION RATIO

    8:1

    EXHAUST

    REVERSE FLOW COMBUSTION CHAMBER

    POWER SECTION - GENERAL

    A320-469a

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    HSPS CT/NOV. 2006 Page 2.33 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMPRESSOR - GENERAL

    Function

    The impeller supplies the required amount of compressed air to the combustor chamber.

    Location

    The impeller is located at the front of the power section.

    Type

    Single stage, high pressure, centrifugal flow impeller.

    Main Features

    Compression ratio: 8:1

    Outlet air temperature: 350C (662F)

    Rotation speed: 49 300 RPM.

    Main Components

    - The impeller is made of titanium alloy. It has main blades and splitter blades. The front and rear shaft are integral with the impeller which is connected at the front to the inter shaft and at the rear to the turbine shaft by curvic-couplings using a tie-bolt.

    - The diffuser assembly is made of stainless steel. It has 19 radial vanes. The diffuser assembly is secured to the scroll with bolts.

    The impeller shield is treated with an abradable material that provides a close tolerance clearance between the shield and the impeller.

    A containment shield for impeller containment is mounted on the outside of the combustor housing.

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    HSPS CT/NOV. 2006 Page 2.34 HAMILTON SUNDSTRAND PROPRIETARY

    IMPELLER CONTAINMENT SHIELD

    COMPRESSOR HOUSING

    IMPELLER SHIELD

    CURVIC COUPLING CURVIC

    COUPLING

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMPRESSOR - GENERAL

    INTER SHAFT MAIN BLADES

    SPLITTER BLADES

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    HSPS CT/NOV. 2006 Page 2.35 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMPRESSOR - DESCRIPTION

    Identification of Compressor Components

    - The intermediate shaft is connected to the front of the load compressor impeller and to the rear of the power section compressor impeller by curvic-couplings.

    - The compressor housing houses the impeller and the compressor shield.

    The compressor housing is attached at the front to the air inlet housing and at the rear to the diffuser assembly and the combustor housing.

    - The impeller containment shield is mounted to the compressor housing.

    - The impeller has main blades and splitter blades. The impeller is connected at the front to the intermediate shaft and at the rear to the turbine by curvic-couplings.

    - The diffuser is mounted to the impeller shield.

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    HSPS CT/NOV. 2006 Page 2.36 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMPRESSOR - DESCRIPTION

    COMPRESSOR HOUSING

    IMPELLER CONTAINMENT SHIELD

    INTERMEDIATE SHAFT

    DIFFUSER

    IMPELLER IMPELLER SHIELD

    POWER SECTION COMPRESSOR - SECTION

    a320-471a

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    HSPS CT/NOV. 2006 Page 2.37 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMBUSTOR CHAMBER - GENERAL

    Function

    The combustor chamber burns the air-fuel mixture and delivers the resulting gas to the turbine.

    Location

    The combustor chamber is located in the middle of the power section.

    Type

    Reverse flow, annular combustor chamber.

    Main Features

    - Fuel air ratio: 1/45

    - Turbine inlet temperature: 1020C (1868F).

    Main Components

    - The combustor housing is made of steel alloy. It houses the combustor chamber. It also has bosses for the mounting of fuel injectors (3 pilot fuel injectors and 6 main fuel injectors) and igniters. The lower part of the external housing is provided with a combustor chamber drain valve.

    - The combustor chamber is used for the fuel air mixture combustion. The combustor chamber and the elbow are made of heat resistant alloy and is provided with air holes and tubes.

    - The heat shield acts as a shield between the bend assembly and the impeller and directs the combustor gases to the turbines.

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    HSPS CT/NOV. 2006 Page 2.38 HAMILTON SUNDSTRAND PROPRIETARY

    AIR COMBUSTOR TUBES HOUSING FUEL

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMBUSTOR CHAMBER - GENERAL

    INJECTOR

    IGNITER

    COMBUSTOR CHAMBER BEND

    ASSEMBLY

    HEAT SHIELD TURBINE

    CONTAINMENT SHIELD

    A320-472a

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    HSPS CT/NOV. 2006 Page 2.39 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMBUSTOR CHAMBER -DESCRIPTION

    Identification of Combustor Chamber Components

    - The combustor housing houses the combustor chamber. It also has bosses for the mounting of the fuel injectors, the igniter plugs and the combustor chamber drain valve.

    - The combustor chamber has holes and tubes that allows air used for combustion and cooling to enter the combustor chamber.

    - The bend assembly guides the burned gases from the combustor chamber to the inlet of the first stage turbine nozzle guide vane.

    - The heat shield protects the diffuser holder plate of the power section impeller.

    The heat shield is located between the bend assembly and the diffuser assembly.

    - The combustor chamber drain valve is threaded into the bottom of the combustor housing, this allows unburned fuel to drain overboard. The valve is closed by air pressure in the combustor housing.

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    HSPS CT/NOV. 2006 Page 2.40 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - COMBUSTOR CHAMBER - DESCRIPTION

    HEAT SHIELD

    BEND ASSEMBLY

    FIRST STAGE TURBINE NOZZLE

    COMBUSTOR CHAMBER

    COMBUSTOR CHAMBER DRAIN VALVE

    COMBUSTOR HOUSING

    COMBUSTOR AIR PRESSURE

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    HSPS CT/NOV. 2006 Page 2.41 HAMILTON SUNDSTRAND PROPRIETARY

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    POWER SECTION - TURBINE - GENERAL

    Function

    The turbine extracts the energy from the combustor gases to drive the impeller, the load compressor and the gearbox.

    Location

    The turbine is located at the rear of the power section.

    Type

    2 stage, axial flow turbine.

    Main Features

    Turbine inlet temperature: 1020C (1868F)

    Turbine outlet temperature: 614C (1137F)

    Rotation speed: 49300 RPM

    Direction of rotation: clockwise (viewed from the rear of the APU).

    Main Components

    The two stage axial flow turbine comprises of:

    - The first stage nozzle guide vane (22 cooled vanes)

    - The first stage turbine wheel (37 fir tree blades inserted into a disc)

    - The second stage nozzle guide vane (26 vanes)

    - The second stage turbine wheel (31 fir tree blades inserted into a disc).

    The turbine wheels are coupled together by curvic-couplings and secured by a tie-bolt.

    A turbine containment shield is located around the turbine wheel.

    The turbine rear shaft is supported by a roller bearing and is located in the rear bearing housing.

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    HSPS CT/NOV. 2006 Page 2.42 HAMILTON SUNDSTRAND PROPRIETARY

    FIRST STAGE SECOND STAGE NOZZLE GUIDE TURBINE WHEEL

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - TURBINE - GENERAL

    FIRST STAGE NOZZLE GUIDE VANE

    VANE

    CONTAINMENT SHIELD

    SECOND STAGE TURBINE WHEEL

    CURVIC COUPLINGS

    ROLLER TIE BEARING BOLT

    A320-474a

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    HSPS CT/NOV. 2006 Page 2.43 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - TURBINE - DESCRIPTION

    Identification of Turbine Components

    - The first stage nozzle guide vane has 22 vanes installed in front of the first stage turbine wheel

    - The first stage turbine wheel has 37 fir tree blades inserted into a disc and secured by blade locks.

    The turbine wheel is connected to the rear of the power section impeller and to the second stage turbine wheel by curvic-couplings

    - The second stage nozzle guide vane has 26 vanes installed in front of the second stage turbine wheel

    - The second stage turbine wheel has 31 fir tree blades inserted into a disc and secured by blade locks. Vibration dampers are fitted between the blades.

    The turbine wheel is connected to the first stage turbine wheel by a curvic coupling.

    The rear of the second stage turbine wheel is supported by a roller bearing

    - The containment shield is located around the turbine wheels.

    - The turbine housing is located between the containment shield and the turbine.

    The turbine housing is connected to the exhaust housing.

  • HSPS CT/NOV..2006 Page 2.44 HAMILTON SUNDSTRAND PROPRIETARY

    FIR TREE BLADES

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - TURBINE - DESCRIPTION

    BLADE LOCKS

    VIBRATION DAMPER

    FIRST STAGE NOZZLE GUIDE VANE

    NOZZLE GUIDE VANE SUPPORT

    FIRST STAGE TURBINE WHEEL

    CONTAINMENT SHIELD

    TURBINE HOUSING

    SECOND STAGE NOZZLE GUIDE VANE

    SECOND STAGE TURBINE WHEEL

    A320-475a

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    HSPS CT/NOV. 2006 Page 2.45 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - EXHAUST - GENERAL

    Function

    The exhaust directs the exhaust gases to the aircraft exhaust pipe.

    Location

    The exhaust diffuser is located inside the APU exhaust housing.

    Type

    One piece, annular exhaust pipe.

    Main Components

    The exhaust housing is constructed of stainless steel and provides a passage for the exhaust gases. The housing also contains the rear bearing and struts that house oil pipes to the rear bearing.

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    HSPS CT/NOV. 2006 Page 2.46 HAMILTON SUNDSTRAND PROPRIETARY

    FLOATING CARBON SQUEEZE SEAL FILM

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - EXHAUST - GENERAL

    STRUT

    DISCHARGE AIR

    REAR BEARING

    AIR BYPASS PLENUM

    LABYRINTH SEAL

    ROLLER BEARING FLEXIBLE

    CAGE

    EXHAUST HOUSING

    A320-451a

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    HSPS CT/NOV. 2006 Page 2.47 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - EXHAUST - DESCRIPTION

    Identification of Exhaust Components

    - The exhaust housing consists of an outer housing and diffuser cone supported by struts.

    The inner cone houses the rear bearing assembly and the rear bearing oil pipes.

    - The rear bearing housing:

    The rear bearing

    The rear end of the tie-bolt

    The securing nut.

    The rear bearing housing has threaded bosses for the mounting of the rear bearing oil pipes.

    - The rear bearing oil pipes:

    The rear bearing oil supply

    The rear bearing oil scavenge

    The rear bearing oil venting.

    - The rear bearing is a roller bearing, it is located inside the rear bearing cage.

    - The rear bearing labyrinth seal is installed on the rear shaft of the second stage turbine wheel.

    The labyrinth seal is pressurized by compressed air from the power section compressor.

    - The air bypass plenum is installed on the exhaust housing and is provided with a drain connected to the drain system.

  • HSPS CT/NOV..2006 Page 2.48 HAMILTON SUNDSTRAND PROPRIETARY

    AIR BYPASS PLENUM

    REAR BEARING HOUSING

    REAR BEARING VENT PIPE

    SECURING NUT EXHAUST

    HOUSING LABYRINTH

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - EXHAUST - DESCRIPTION

    SEAL

    REAR BEARING OIL SUPPLY PIPE

    REAR BEARING SCAVENGE PIPE

    REAR BEARING

    TIE BOLT

    CAGE A320-476a

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    HSPS CT/NOV. 2006 Page 2.49 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - OPERATION (1)

    The power section produces the shaft power through the thermodynamic cycle: compression, combustion, expansion and exhaust.

    Compression

    Ambient air is directed into the blades of the rotating impeller. The air then flows through the divergent passages of the diffuser. (The air velocity is transformed into pressure.)

    Combustion

    The compressed air is divided into two flows:

    - A primary flow mixed with the fuel for combustion

    - A secondary flow (dilution air) to cool the combustor and internal parts.

    As a result of the continuous burning process, the pressure decreases slightly whereas the velocity and the temperature increase.

    Expansion

    Expansion of the gases takes place across the two stages of the turbines, this transforms the gas energy into shaft power.

    The gases flow through the nozzle guide vanes which increase the velocity, then across the turbine blades. The aerodynamic forces cause the turbine wheels to rotate.

    During expansion, the velocity of the gases increases and the pressure and temperature decrease.

    Exhaust

    The gases are then expelled overboard through the exhaust system.

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    HSPS CT/NOV. 2006 Page 2.50 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - OPERATION (1)

    AMBIENT AIR COMPRESSED AIR COMBUSTION EXHAUST FUEL

    a320-477a

    PRESSURE AND TEMPERATURE VALUES ARE GIVEN AT ZERO DESIGN POINT FOR INFORMATION

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    HSPS CT/NOV. 2006 Page 2.51 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - OPERATION (2)

    The power section provides air flow to pressurize the APU labyrinth seals, to cool internal heated parts and balance rotor forces.

    Pressurization

    - Pressurization of Labyrinth Seals

    Labyrinth seals are supplied with air pressure. A pressure difference across the seals provide a non contact seal.

    - Pressurization of Load Compressor Front Bearing

    The pressurized air, bled from the outlet of the power section impeller, flows through an external pipe to the labyrinth seal of the load compressor front bearing and the cooling fan labyrinth seal.

    - Pressurization of Power Section Rear Bearing

    The pressurized air, bled at the outlet of the power section impeller, flows through the power section rotor assembly to the rear bearing labyrinth seal.

    Cooling

    To prevent excessive heating of the parts subjected to the combustion gases, a circulation of cooling air (bled at the outlet of the power section impeller) is provided through the power section rotor assembly, and is directed by internal passages to the turbine wheel faces.

    Balance of Forces

    The shaft, the turbine wheels, and the compressor impellers are subjected to axial forces resulting from the operation of the rotor assembly.

    To reduce the forces on the bearings, air pressure is used on the backside of the power section impeller.

  • HSPS CT/NOV..2006 Page 2.52 HAMILTON SUNDSTRAND PROPRIETARY

    AXIAL THRUST

    EXTERNAL PIPE TO LOAD LCOMPRESSOR FRONT BEARING AND COOLING FAN LABYRINTH SEALS

    AMIENT AIR COMPRESSED AIR EXPELLED SEAL AND COOLING AIR

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    POWER SECTION - OPERATION (2) a320-478a

    FRONT BEARING LABYRINTH SEAL AIR

    REAR BEARING LABYRINTH SEAL AIR

  • .

    HSPS CT/NOV. 2006 Page 2.53 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIART POWER UNIT

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV. 2006 Page 3.0 HAMILTON SUNDSTRAND PROPRIETARY

    APS 3200 AUXILIARY POWER UNIT

    SECTION 3

    OIL SYSTEM

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV. 2006 Page 3.1 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SYSTEM - GENERAL

    Function

    The system is used to lubricate and cool the APU and the AC generator.

    Location

    The system components are all located on the gearbox except the oil cooler. The cooler is located on the left side of the APU.

    Main Features

    Self contained, full flow system.

    - Max oil temperature: 135C (275F)

    - Normal oil pressure: 345 - 414 kPa (50 - 60 PSIG)

    - Low oil pressure: 241 kPa (35 PSIG)

    - Oil quantity: 5.4 liters (5.72 Qts) at FULL mark

    Lubrication and Cooling Requirements

    - The APU rear bearing

    - The APU front bearing

    - The gearbox gears and bearings

    - The AC generator

    - Cooling Fan

  • HSPS CT/NOV.. 2006 Page 3.2 HAMILTON SUNSTRAND PROPRIETARY

    FRONT

    BEARING

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SYSTEM - GENERAL

    REAR BEARING

    GEARBOX GEARS AND BEARINGS

    LUBRICATION AND

    COOLING OF AC GENERATOR

    OIL SYSTEM MAIN FEATURES

    MAX OIL TEMPERATURE

    135 C (275 F) NORMAL OIL PRESSURE

    345 414 Kpa (50-60 PSIG) LOW OIL PRESSURE

    241 KPa (35 PSIG) OIL QUANTITY

    5.4 liters (5.72 Qts)

    OIL SYSTEM COMPONENTS ON GEARBOX

    (EXCPT OIL COOLER)

    OIL SYSTEM - GENERAL

  • HSPS CT/NOV.. 2006 Page 3.3 HAMILTON SUNSTRAND PROPRIETARY

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    OIL SYSTEM - DESCRIPTION

    Oil Sump

    The oil sump is formed by the lower part of the gearbox.

    The gearbox has a fill tube for gravity filling, an overflow drain, a pressure fill connector and a sight glass.

    The gearbox intermediate gear also functions as the air/oil separator and provides air venting of the gearbox.

    Oil Pumps

    One lubrication pump and two scavenge pumps are driven by the gearbox.

    The pressure system is provided with a pressure relief valve located on the front of the gearbox.

    Oil Filters

    There is one filter in the lubrication line and one in the AC generator scavenge line.

    Both filters are the same and each have a filter element impending blockage switch indicator. They are mounted on the lower front face of the gearbox. The oil filter by pass valve for each filter is located in the gearbox and is non adjustable.

    Oil Cooler

    The oil cooler cools the oil and has a by-pass valve.

    De-oiling Valve

    The de-oiling valve is a solenoid valve located at the inlet of the pressure pump. When energized open, the valve prevents oil flow thus reducing the APU starting loads on the starter.

    Monitoring Devices

    - Low oil pressure switch

    - High oil temperature sensor

    - AC generator high oil temperature sensor

    - Oil level sensor

    - Oil level sight glass

    - Oil filter impending blockage switch indicator on each oil filter assembly

    - Magnetic drain plug.

  • HSPS CT/NOV.. 2006 Page 3.4 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SYSTEM - DESCRIPTION

    OIL SUMP OIL PRESSURE OIL RETURN AIR-OIL MIST

    SCAVENGE PUMPS

    OIL FILTER BYPASS VALVES

    OIL FILTERS OIL LEVEL SIGHT GLASS

    AC GENERATOR HIGH OIL TEMPERATURE SENSOR

    LOW OIL PRESSURE SWITCH

    PRESSURE RELIEF VALVE

    CHECK VALVE

    CHECK VALVE

    OIL COOLER

    AIR OIL SEPERATOR

    LUBRICATION PUMP

    DE-OILING VALVE

    OIL LEVEL SENSOR

    OIL FILLER TUBE

    MAGNETIC DRAIN PLUG

    HIGH OIL TEMPERATURE SENSOR

    a 320-481a

  • HSPS CT/NOV.. 2006 Page 3.5 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SYSTEM OPERATION

    The main functions of the oil system are : oil supply, scavenge return, venting and indicating. Oil Supply The lubrication pump draws the oil from the sump and delivers it to the oil system. During starting, the de-oiling valve opens and air is drawn into the pump to prevent oil flow. After de-oiling the oil flows to the oil cooler, then to the filter. In the event oil flow through the filter becomes restricted, the switch indicator is activated. If the filter becomes blocked, the oil filter bypass valve will open and allow flow to the oil system. The oil pressure relief valve opens to regulate the oil system pressure. When the valve is open, some of the oil flow is bypassed back to the inlet side of the lubrication pump. Scavenge Return After lubrication, the oil returns to the gearbox sump by two scavenge pumps: - One for the power section rear bearing that returns the oil directly

    to the sump - One for the AC generator that returns the oil to the sump through a

    filter. Note: The front bearing and the gearbox are scavenged by gravity.

    Scavenge Return After lubrication, the oil returns to the gearbox sump by two scavenge pumps: -One for the power section rear bearing that returns the oil directly to

    the sump One for the AC generator that returns the oil to the sump through a

    filter. Note: The front bearing and the gearbox are scavenged by gravity. Venting Oil mist in the gearbox is separated by a centrifugal air-oil separator. The gearbox is vented to the exhaust through an external pipe. Monitoring - Low oil pressure switch -High oil temperature sensor - AC generator high oil temperature sensor - Oil filter impending blockage switch indicators - Oil level sensor - Oil level sight glass - Magnetic drain plug

  • V

    HSPS CT/NOV.. 2006 Page 3.6 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SYSTEM - OPERATION

    OIL SUPPLY OIL PRESSURE SCAVENGE RETURN VENTING

    a 320-481 a OIL SYSTEM - OPERATION

  • HSPS CT/NOV.. 2006 Page 3.7 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    ENGINE LUBRICATION (1)

    Lubrication is required for the AC generator, the gearbox and the APU bearings.

    AC Generator Lubrication and Cooling

    Oil Supply

    From the lubrication pump and filter, the oil is supplied to the AC generator:

    - One flow for cooling

    - A second flow to lubricate the generator drive shaft splines.

    Scavenge and Return

    The oil from the AC generator is scavenged by a pump and returned to the gearbox sump through a filter.

    Gearbox Lubrication

    Oil Supply

    The oil flowing from the lubrication pump passes through the filter and then by means of internal lines and jets is sprayed onto the gears and bearings.

    From the gearbox the oil is also supplied to the cooling fan bearings and to the rotor assembly front bearing.

    Scavenge and Return

    After lubrication the oil returns to the gearbox sump by gravity.

  • HSPS CT/NOV.. 2006 Page 3.8 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    ENGINE LUBRICATION (1) AC GENERATOR LUBRICATION

    GEARBOX LUBRICATION

    AC GENERATOR LUBRICATION AND COOLING

    AC GENERATOR OIL SCAVENGE

    FROM LUBRICATION PUMP

    FROM LUBRICATION PUMP

    DE-OILED AIR TO EXHAUST

    DE-OILED AIR TO EXHAUST

    AC GENERATOR DRIVE SHAFT SPLINE LUBRICATION

    SPRAY JETS

    TO LUBRICATION PUMP

    TO LUBRICATION PUMP

    OIL RETURN TO SUMP

    OIL SUPPLY OIL PRESSURE SCAVENGE RETURN VENTING

    AC GENERATOR LUBRICATION

    a 320-482 a

  • HSPS CT/NOV.. 2006 Page 3.9 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    ENGINE LUBRICATION (2)

    Front Bearing Lubrication

    Oil Supply

    The lubrication for the rotor front bearing is provided by pressurized oil from the gearbox oil system.

    A jet located in the gearbox housing sprays oil between the front end of the load compressor shaft and the front bearing nut. (Phonic Wheel)

    The oil runs along the shaft, lubricates the quill shaft splines and enters the gap through the split inner races to lubricate the bearing.

    Oil flow to the bearing is also provided by oil passages between the gearbox and bearing outer race to provide a squeeze film to dampen bearing vibration.

    Scavenge and Return

    After lubrication the oil is returned to the sump by gravity.

    Sealing

    Oil sealing of this assembly is by a floating carbon seal and a labyrinth seal using air from the power section impeller.

    A drain cavity between the seals is vented overboard, into the APU drainmast.

  • HSPS CT/NOV.. 2006 Page 3.10 HAMILTON SUNSTRAND PROPRIETARY

    FLOATING AIR FROM CARBON SEAL

    POWER SECTION IMPELLER

    SQUEEZE FILM

    BALL BEARING

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    ENGINE LUBRICATION (2) - FRONT BEARING LUBRICATION

    INTERNAL OIL SUPPLY

    FRONT BEARING NUT

    DRAIN CAVITY

    LOAD COMPRESSOR IMPELLER

    LABYRINTH SEALS

    a 320-452 a

    OIL PRESSURE SPRAY COMPRESSED AIR SEA L AIR VENT

  • HSPS CT/NOV.. 2006 Page 3.11 HAMILTON SUNSTRAND PROPRIETARY

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    ENGINE LUBRICATION (3)

    Rear Bearing Lubrication

    Oil Supply

    The lubrication of the rotor rear bearing is provided by pressurized oil from the gearbox oil system.

    The oil is supplied to the rear bearing through an external pipe.

    In the bearing area, the oil is directed to the outer race to provide a squeeze film and an internal line that sprays oil into the rear tie-bolt area.

    Drilled passages in the tie-bolt allow oil circulation for lubrication and cooling of the roller bearing.

    Scavenge and Return

    After lubrication, the oil is scavenged back to the sump through an external pipe by a scavenge pump.

    Sealing

    Oil sealing in the bearing area is accomplished by a floating carbon seal and a rotating labyrinth seal. The seals are pressurized with air flow from the power section impeller.

  • HSPS CT/NOV. 2006 Page 3.12 HAMILTON SUNDSTRAND PROPRIETARY

    OIL SUPPLY

    TIE BOLT

    SQUEEZE FILM

    SECOND STAGE TURBINE WHEEL

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    ENGINE LUBRICATION (3) - REAR BEARING LUBRICATION

    a 320-453 a

    ROTATING LABYRINTH SEAL

    ROLLER BEARING

    AIR FROM POWER SECTION IMPELLER

    FLOATING CARBON SEAL

    OIL PRESSURE OIL RETURN COMPRESSOR AIR

  • HSPS CT/NOV. 2006 Page 3.13 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SUMP Function

    The sump provides a reservoir for the APU lubrication system.

    Location

    The sump is located in the bottom of the gearbox.

    Main Features

    - Capacity at the "FULL" mark: 5.4 litters (5.72 Qts)

    - Capacity at the "ADD" mark: 3.95 litters (4.16 Qts)

    Main Components

    The main components of the oil sump are:

    - Oil filler tube

    - Oil overflow boss

    - Oil pressure fill port

    - Air-oil separator

    - Magnetic drain plug

    - Pressure relief valve

    - Oil level sensor

    - Oil level sight glass.

  • HSPS CT/NOV.. 2006 Page 3.14 HAMILTON SUNSTRAND PROPRIETARY

    GEARBOX

    OIL FILLER TUBE

    OIL OVERFLOW BOSS

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL SUMP

    OIL LEVEL SENSOR

    MAGNETIC DRAIN PLUG PRESSURE

    RELIEF VALVE

    OIL PRESSURE FILL PORT

    OIL LEVEL SIGHT GLASS

    GEARBOX LEFT SIDE VIEW GEARBOX FRONT VIEW

    a 320-483 a

  • HSPS CT/NOV. 2006 Page 3.15 HAMILTON SUNDSTRAND PROPRIETARY

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    AIR-OIL SEPARATOR

    Function

    The air-oil separator separates the oil from the air.

    Location

    The air-oil separator is located in the upper part of the gearbox.

    Description

    The air-oil separator is part of the gearbox intermediate gear.

    The gear has a hollow shaft with radial drillings. The rear of the hollow shaft vents into a passage in the gearbox housing.

    Operation

    An air-oil mist is created in the gearbox when the APU is operating. The oil is separated from the air by the rotating action of the gearbox intermediate gear. The oil returns to the gearbox sump by gravity and the air is vented through a pipe to the APU exhaust.

  • HSPS CT/NOV.. 2006 Page 3.16 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    AIR-OIL SEPARATOR

    INTERMEDIATE GEAR

    AIR-OIL SEPERATOR

    OIL RETURN TO SUMP

    OIL MIST DE-OILED AIR

    TO APU EXHAUST

    OIL RETURN TO SUMP

    AIR OIL SEPERATOR

  • HSPS CT/NOV. 2006 Page 3.17 HAMILTON SUNDSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL PUMPS - GENERAL

    Function One pump is used for the lubrication supply and two pumps for scavenge. Location The oil pumps are located inside the gearbox front face. Main Features - Lubrication pump

    Type: Vane type Flow: 2160 l/h (570 GPH)

    - AC generator scavenge pump Type: Vane type pump Flow: 2160 l/h (570 GPH)

    - Rear bearing scavenge pump Type: Gerotor type pump Flow: 160 l/h (42 GPH)

    OIL PUMPS - DESCRIPTION

    Gerotor Type The gerotor is a positive displacement pumping unit consisting of two elements: an inner and outer rotor. The inner rotor has one less tooth than the outer, and has its centerline positioned at a fixed eccentricity from the centerline of the outer element. The inner element is driven by the gearbox. Vane Type The vane type pump consisting of a slotted inner rotor equipped with vanes operating in an eccentric housing. Operation of the Pressure Relief Valve The oil pressure relief valve is a non adjustable, spring loaded relief valve. The valve will open when oil pressure reaches 345-414 kPag (50-60 PSIG). The oil that is bypassed, returns to the inlet of the lubrication pump.

  • HSPS CT/NOV.. 2006 Page 3.18 HAMILTON SUNSTRAND PROPRIETARY

    AC GENERATOR SCAVENGE PUMP

    FUEL CONTROL UNIT DRIVE

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL PUMPS - GENERAL - DESCRIPTION

    OIL SCAVENGE PUMPS

    OIL PRESSURE PUMP PRESSURE

    RELIEF VALVE

    OIL PUMP DRIVE GEARS

    REAR BEARING SCAVENGE PUMP

    LUBRICATION PUMP

    a 320-485 a

  • HSPS CT/NOV. 2006 Page 3.19 HAMILTON SUNDSTRAND PROPRIETARY

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    DE-OILING VALVE Function

    The de-oiling valve reduces the APU starting lead during start conditions.

    Location

    The valve is located on the left side of the gearbox.

    Main Features

    - Solenoid valve operated by the ECB

    - Nominal rating: 28 VDC; 1.0 amps

    - Solenoid valve energized open.

    Description

    The de-oiling valve is a solenoid operated valve directly controlled by the ECB.

    Operation

    During the APU start up the de-oiling valve is energized open by the ECB. When the valve is open the lubrication pump is prevented from pumping oil into the system. This reduces the starting load of the APU and allows faster acceleration.

    When the APU accelerates to 55% speed, the ECB de-energizes the de-oiling valve and allows the lubrication pump to produce oil flow.

    During shutdown, the de-oiling valve is again energized by the ECB when the APU de-accelerates to 90% speed. This allows the oil remaining in the system to return to the oil sump with the exception of one quart remaining in the oil cooler.

  • HSPS CT/NOV.. 2006 Page 3.20 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    DE-OILING SYSTEM

    DE-OILING VALVE

    AIR

    GEARBOX LEFT SIDE TO OIL

    OIL SUMPCOOLER

    OIL FROM

    ECB TO LUBRICATION

    PUMP

    AIR

    SUMPDE-OILING VALVE

    a 320-486a

    DE OILING SYSTEM

  • HSPS CT/NOV. 2006 Page 3.21 HAMILTON SUNDSTRAND PROPRIETARY

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    OIL FILTERS - GENERAL

    Function

    The function of the oil filters is to filter the oil.

    There are two filters: one for lubrication and one for the AC generator scavenge. They are the same type of filter.

    Location

    The lubrication filter is located in the pressure line after the oil cooler. The scavenge filter is located after the AC generator scavenge pump.

    Both filters are installed at the bottom front face of the gearbox.

    Main Features

    - Filter element: 20 microns

    - By-pass valve setting: 345-414 kPad (50-60 PSID)

    - Switch indicator setting: 207-241 kPad (30-35 PSID).

    OIL FILTERS - DESCRIPTION

    Each filter system consists of:

    - A 20 micron disposable cartridge

    - An oil filter impending blockage switch indicator

    - A by-pass valv

  • HSPS CT/NOV.. 2006 Page 3.22 HAMILTON SUNSTRAND PROPRIETARY

    LUBRICATION FILTER

    SWITCH INDICATOR

    AC GENERATOR SCAVENGE FILTER

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL FILTERS - GENERAL - DESCRIPTION

    LUBRICATION FILTER

    a 320-487 a

  • HSPS CT/NOV. 2006 Page 3.23 HAMILTON SUNDSTRAND PROPRIETARY

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    OIL FILTER - OPERATION

    Oil Flow

    In normal operation the oil is filtered and then flows to the oil system.

    Pre-blockage of the Oil Filters

    Should the filter become contaminated, a difference in pressure across the filter will occur.

    Two switch indicators are mounted on the front of the gearbox near each oil filter. The switch indicator provides a visual indication when the oil temperature is 74C (165F) and the oil pressure across the filter reaches 241 kPad (30-35 PSID). The ECB also monitors each switch indicator and will store the fault message.

    By-pass

    When the differential pressure across the filter exceeds 345 to 414 kPad (50 to 60 PSID), the by-pass valve will open and allow unfiltered oil to flow into the system.

    The by-pass valve is located in the gearbox and is non-adjustable.

  • HSPS CT/NOV. 2006 Page 3.24 HAMILTON SUNDSTRAND PROPRIETARY

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    OIL FILTER - OPERATION

    a 320-488 a

    OIL FILTER - OPERATION

  • HSPS CT/NOV.. 2006 Page 3.25 HAMILTON SUNSTRAND PROPRIETARY

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    OIL COOLER - GENERAL

    Function

    The oil cooler transfers the heat of the lubricating oil to the air flowing through the cooler.

    Location

    The oil cooler is installed on the left side of the APU.

    In the oil system, the cooler is located between the lubrication pump and the filter.

    Main Features

    - Oil cooling ability: 2160 l/h (540 GPH)

    - Oil cooler by-pass valve setting:

    Opening threshold: 207 kPad (30 PSID)

    Fully open: 345 kPad (50 PSID).

    OIL COOLER - DESCRIPTION

    The oil cooler is a rectangular unit which includes:

    - An oil cooler housing which consists of an integrally brazed aluminum heat-exchanger with an aluminum core and a stainless steel housing.

    - A check valve and a by-pass valve to regulate the oil flow and internal pressure of the oil cooler.A drain plug to drain the oil cooler

  • HSPS CT/NOV.. 2006 Page 3.26 HAMILTON SUNSTRAND PROPRIETARY

    OIL COOLER GENERAL - DESRIPTION

    a 320-489 a

    Use or disclosure of this data is subject to the restriction on the title page of this document.

  • HSPS CT/NOV.. 2006 Page 3.27 HAMILTON SUNSTRAND PROPRIETARY

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL COOLER - OPERATION

    Normal Operation

    The oil delivered by the lubrication pump flows through the aluminum cooling tubes that are cooled by the cooling fan air flow.

    The cooled oil then flows to the various APU lubrication points.

    By-pass Operation

    When the pressure exceeds 207 kPad (30 PSID), the bypass valve opens.

    The oil flow by-passes the cooler to the lubrication system.

    Check Valve Operation

    The check valve is an oil pressure operated valve.

    When the pressure in the oil system is low (de-oiling during start and shutdown), the check valve closes and prevents draining of the oil cooler into the sump.

    The check valve traps approximately one quart of oil in the oil cooler when the APU is not running.

    Air Flow

    The oil cooler uses the airflow from the cooling fan to remove heat from the oil. The heated air is then discharged overboard through an air duct located in the left APU compartment service door.

  • HSPS CT/NOV.. 2006 Page 3.28 HAMILTON SUNSTRAND PROPRIETARY

    COOLING AIR INLET COOLING AIR INLET

    Use or disclosure of this data is subject to the restriction on the title page of this document.

    OIL COOLER - OPERA