《Civil Avionics Systems》第二版
《Civil Avionics Systems》第二版民用航空电子系统
作者：
Ian Moir
Allan Seabridge
Malcolm Jukes
Aerospace Consultant, UK
出版社：Wiley
出版时间：2013年
目录
About the Authors xix
Series Preface xxi
Preface to Second Edition xxii
Preface to First Edition xxiii
Acknowledgements xxv
List of Abbreviations xxvi
1 Introduction 1
1.1 Advances since 2003 1
1.2 Comparison of Boeing and Airbus Solutions 2
1.3 Outline of Book Content 2
1.3.1 Enabling Technologies and Techniques 3
1.3.2 Functional Avionics Systems 4
1.3.3 The Flight Deck 4
1.4 The Appendices 4
2 Avionics Technology 7
2.1 Introduction 7
2.2 Avionics Technology Evolution 8
2.2.1 Introduction 8
2.2.2 Technology Evolution 8
2.3 Avionics Computing 11
2.3.1 The Nature of an Avionics Computer 11
2.3.2 Resolution (Digitisation) 13
2.3.3 The Sampling Frequency (Refresh Rate) 14
2.4 Digital Systems Input and Output 19
2.4.1 Introduction 19
2.4.2 Analogue to Digital Process 20
2.4.3 Sampling Rate 22
2.4.4 Digital to Analogue Process 23
2.4.5 Analogue Signal Conditioning 25
2.4.6 Input Signal Protection and Filtering 27
2.4.7 Analogue Signal Types 29
Contents vii
2.5 Binary Arithmetic 29
2.5.1 Binary Notations 29
2.5.2 Binary Addition, Subtraction, Multiplication
and Division 32
2.5.3 The Arithmetic Logic Unit 32
2.6 The Central Processing Unit (CPU) 34
2.6.1 CPU Instruction Format 35
2.6.2 Instruction Execution Sequence 35
2.6.3 Extended Operand Addressing Modes 42
2.7 Software 43
2.7.1 Software Introduction 43
2.7.2 Assemblers and Compilers 43
2.7.3 Software Engineering 44
2.7.4 Software Design Process Assurance 45
2.7.5 Languages 47
2.7.6 Object-Oriented Design 49
2.7.7 Auto-code Generation 50
2.7.8 Real-Time Operating System (RTOS) 51
2.8 Microprocessors 53
2.8.1 Moore’s Law 53
2.8.2 Significant Microprocessors used in
Aerospace Applications 54
2.8.3 CPU Cache 57
2.8.4 Microcontrollers 58
2.8.5 Rock’s Law 59
2.9 Memory Technologies 59
2.9.1 Desired Avionics Memory Attributes 60
2.9.2 Available Memory Technology Attributes 60
2.9.3 Memory Device Summary 64
2.9.4 Memory Hierarchy 64
2.10 Application-Specific Integrated Circuits (ASICs) 64
2.10.1 Main Types of ASICs 64
2.10.2 Field Programmable Gate Array (FPGA) 66
2.10.3 Semi-custom Standard Cell Design ASIC 68
2.10.4 Design Tools 68
2.10.5 RTCA-DO-254/ED 80 69
2.11 Integrated Circuits 70
2.11.1 Logic Functions 70
2.11.2 The MOS Field Effect Transistor (MOSFET) 70
2.11.3 IC Fabrication 70
2.12 Integrated Circuit Packaging 73
2.12.1 Wafer Probe and Test 74
2.12.2 Wafer Separation and Die Attachment 74
2.12.3 Wire Bonding 75
2.12.4 Packaging 75
References 77
viii Contents
3 Data Bus Networks 79
3.1 Introduction 79
3.2 Digital Data Bus Basics 80
3.2.1 Data Bus Overview 80
3.2.2 Bit Encoding 82
3.2.3 Attributes 83
3.2.4 Transmission Classes 83
3.2.5 Topologies 83
3.2.6 Transmission Rates 84
3.3 Transmission Protocols 84
3.3.1 Transmission Protocols Overview 84
3.3.2 Time-Slot Allocation Protocol 86
3.3.3 Command/Response Protocol 87
3.3.4 Token Passing Protocol 88
3.3.5 Contention Protocol 88
3.4 ARINC 429 88
3.4.1 ARINC 429 Overview 88
3.4.2 ARINC 429 Architecture Realisation 90
3.5 MIL-STD-1553B 91
3.5.1 MIL-STD-1553B Overview 91
3.5.2 MIL-STD-1553B Word Formats 92
3.5.3 Bus Controller to Remote Terminal (BC-RT) Protocol 94
3.5.4 Remote Terminal to Bus Controller (RT-BC) Protocol 94
3.5.5 Remote Terminal to Remote Terminal (RT-RT) Protocol 95
3.5.6 Broadcast Protocol 95
3.5.7 Error Management 95
3.6 ARINC 629 97
3.6.1 ARINC 629 Overview 97
3.6.2 ARINC 629 Protocol 97
3.6.3 ARINC 629 Bus Coupler 99
3.6.4 ARINC 629 Architecture Realisation 99
3.7 ARINC 664 Part 7 100
3.7.1 ARINC 664 Overview 100
3.7.2 Ethernet Frame Format 101
3.7.3 Network Topology 101
3.7.4 Contention Avoidance 103
3.7.5 Virtual Links 105
3.7.6 Protocol 107
3.7.7 Summary 109
3.7.8 Cables 109
3.8 CANbus 110
3.8.1 CANbus Overview 110
3.8.2 CANbus Message Formats 110
3.8.3 CANbus Variants 112
3.9 Time Triggered Protocol 113
3.10 Fibre-optic Data Communications 113
Contents ix
3.10.1 Attributes of Fibre-optic Data Transmission 113
3.10.2 Physical Implementation 114
3.11 Data Bus Summary 115
3.11.1 Data Bus Overview 115
3.11.2 Contrasting Traffic Management Techniques 117
References 118
4 System Safety 119
4.1 Introduction 119
4.2 Flight Safety 120
4.2.1 Introduction 120
4.2.2 Flight Safety Overview 120
4.2.3 Accident Causes 124
4.3 System Safety Assessment 124
4.3.1 Introduction 124
4.3.2 Key Agencies, Documents and Guidelines 125
4.3.3 Failure Classification 126
4.3.4 In-Service Experience 127
4.3.5 Safety Assessment Processes 127
4.4 Reliability 128
4.4.1 Introduction 128
4.4.2 Failure Mechanisms 128
4.4.3 The Relationship between Probability and Mean
Time between Failures 130
4.4.4 Assessment of Failure Probability 132
4.4.5 Reliability Management 133
4.5 Availability 134
4.5.1 Introduction 134
4.5.2 Classic Probability Theory 135
4.5.3 Simplex Architecture 135
4.5.4 Triplex Architecture 136
4.5.5 Triplex Architecture plus Backup 136
4.6 Integrity 138
4.6.1 Built-in-Test 139
4.6.2 Cross-Monitoring 140
4.7 Redundancy 141
4.7.1 Simplex Architecture 142
4.7.2 Duplex Architecture 142
4.7.3 Dual Command: Monitor Architecture 143
4.7.4 Triplex Architecture 145
4.7.5 Quadruplex Architecture 146
4.7.6 Summary 147
4.8 Analysis Methods 148
4.8.1 Top-Down Methods 148
4.8.2 Bottom-Up Methods 149
4.8.3 Lighting System Example 149
x Contents
4.9 Other Considerations 151
4.9.1 Exposure Time (Time at Risk) 151
4.9.2 Cascade and Common Mode Faults 152
4.9.3 Dissimilarity 153
4.9.4 Segregation and Partitioning 155
4.9.5 Dispatch Availability 156
References 157
5 Avionics Architectures 159
5.1 Introduction 159
5.2 Avionics Architecture Evolution 159
5.2.1 Overview of Architecture Evolution 159
5.2.2 Distributed Analogue Architecture 161
5.2.3 Distributed Digital Architecture 162
5.2.4 Federated Digital Architecture 164
5.2.5 Integrated Modular Avionics 166
5.2.6 Open System Standards 169
5.3 Avionic Systems Domains 169
5.3.1 The Aircraft as a System of Systems 169
5.3.2 ATA Classification 171
5.4 Avionics Architecture Examples 172
5.4.1 The Manifestations of IMA 172
5.4.2 The Airbus A320 Avionics Architecture 173
5.4.3 The Boeing 777 Avionics Architecture 174
5.4.4 Honeywell EPIC Architecture 179
5.4.5 The Airbus A380 and A350 180
5.4.6 The Boeing 787 184
5.5 IMA Design Principles 188
5.6 The Virtual System 189
5.6.1 Introduction to Virtual Mapping 189
5.6.2 Implementation Example: Airbus A380 191
5.6.3 Implementation Example: Boeing 787 193
5.7 Partitioning 194
5.8 IMA Fault Tolerance 195
5.8.1 Fault Tolerance Principles 195
5.8.2 Data Integrity 196
5.8.3 Platform Health Management 197
5.9 Network Definition 197
5.10 Certification 198
5.10.1 IMA Certification Philosophy 198
5.10.2 Platform Acceptance 199
5.10.3 Hosted Function Acceptance 200
5.10.4 Cost of Change 200
5.10.5 Configuration Management 201
5.11 IMA Standards 201
References 203
Contents xi
6 Systems Development 205
6.1 Introduction 205
6.1.1 Systems Design 205
6.1.2 Development Processes 206
6.2 System Design Guidelines 206
6.2.1 Key Agencies and Documentation 206
6.2.2 Design Guidelines and Certification Techniques 207
6.2.3 Guidelines for Development of Civil Aircraft and
Systems – SAE ARP 4754A 208
6.2.4 Guidelines and Methods for Conducting the
Safety Assessment – SAE ARP 4761 208
6.2.5 Software Considerations – RTCA DO-178B 209
6.2.6 Hardware Development – RTCA DO-254 209
6.2.7 Integrated Modular Avionics – RTCA DO-297 209
6.2.8 Equivalence of US and European Specifications 210
6.3 Interrelationship of Design Processes 210
6.3.1 Functional Hazard Assessment (FHA) 210
6.3.2 Preliminary System Safety Assessment (PSSA) 212
6.3.3 System Safety Assessment (SSA) 213
6.3.4 Common Cause Analysis (CCA) 213
6.4 Requirements Capture and Analysis 213
6.4.1 Top-Down Approach 214
6.4.2 Bottom-Up Approach 214
6.4.3 Requirements Capture Example 215
6.5 Development Processes 217
6.5.1 The Product Life-Cycle 217
6.5.2 Concept Phase 218
6.5.3 Definition Phase 219
6.5.4 Design Phase 220
6.5.5 Build Phase 221
6.5.6 Test Phase 222
6.5.7 Operate Phase 223
6.5.8 Disposal or Refurbish Phase 223
6.6 Development Programme 224
6.6.1 Typical Development Programme 224
6.6.2 ‘V’ Diagram 226
6.7 Extended Operations Requirements 226
6.7.1 ETOPS Requirements 226
6.7.2 Equipment Requirements 228
6.8 ARINC Specifications and Design Rigour 229
6.8.1 ARINC 400 Series 229
6.8.2 ARINC 500 Series 229
6.8.3 ARINC 600 Series 229
6.8.4 ARINC 700 Series 230
6.8.5 ARINC 800 Series 230
6.8.6 ARINC 900 Series 230
xii Contents
6.9 Interface Control 231
6.9.1 Introduction 231
6.9.2 Interface Control Document 231
6.9.3 Aircraft-Level Data-Bus Data 231
6.9.4 System Internal Data-Bus Data 233
6.9.5 Internal System Input/Output Data 233
6.9.6 Fuel Component Interfaces 233
References 233
7 Electrical Systems 235
7.1 Electrical Systems Overview 235
7.1.1 Introduction 235
7.1.2 Wider Development Trends 236
7.1.3 Typical Civil Electrical System 238
7.2 Electrical Power Generation 239
7.2.1 Generator Control Function 239
7.2.2 DC System Generation Control 240
7.2.3 AC Power Generation Control 242
7.3 Power Distribution and Protection 248
7.3.1 Electrical Power System Layers 248
7.3.2 Electrical System Configuration 248
7.3.3 Electrical Load Protection 250
7.3.4 Power Conversion 253
7.4 Emergency Power 254
7.4.1 Ram Air Turbine 255
7.4.2 Permanent Magnet Generators 256
7.4.3 Backup Systems 257
7.4.4 Batteries 258
7.5 Power System Architectures 259
7.5.1 Airbus A320 Electrical System 259
7.5.2 Boeing 777 Electrical System 261
7.5.3 Airbus A380 Electrical System 264
7.5.4 Boeing 787 Electrical System 265
7.6 Aircraft Wiring 268
7.6.1 Aircraft Breaks 269
7.6.2 Wiring Bundle Definition 270
7.6.3 Wiring Routing 271
7.6.4 Wiring Sizing 272
7.6.5 Aircraft Electrical Signal Types 272
7.6.6 Electrical Segregation 274
7.6.7 The Nature of Aircraft Wiring and Connectors 274
7.6.8 Used of Twisted Pairs and Quads 275
7.7 Electrical Installation 276
7.7.1 Temperature and Power Dissipation 278
7.7.2 Electromagnetic Interference 278
7.7.3 Lightning Strikes 280
Contents xiii
7.8 Bonding and Earthing 280
7.9 Signal Conditioning 282
7.9.1 Signal Types 282
7.9.2 Signal Conditioning 283
7.10 Central Maintenance Systems 284
7.10.1 Airbus A330/340 Central Maintenance System 285
7.10.2 Boeing 777 Central Maintenance
Computing System 288
References 290
Further Reading 290
8 Sensors 291
8.1 Introduction 291
8.2 Air Data Sensors 292
8.2.1 Air Data Parameters 292
8.2.2 Pressure Sensing 292
8.2.3 Temperature Sensing 292
8.2.4 Use of Pressure Data 294
8.2.5 Pressure Datum Settings 295
8.2.6 Air Data Computers (ADCs) 297
8.2.7 Airstream Direction Detectors 299
8.2.8 Total Aircraft Pitot-Static System 300
8.3 Magnetic Sensors 301
8.3.1 Introduction 301
8.3.2 Magnetic Field Components 302
8.3.3 Magnetic Variation 303
8.3.4 Magnetic Heading Reference System 305
8.4 Inertial Sensors 306
8.4.1 Introduction 306
8.4.2 Position Gyroscopes 306
8.4.3 Rate Gyroscopes 306
8.4.4 Accelerometers 308
8.4.5 Inertial Reference Set 309
8.4.6 Platform Alignment 312
8.4.7 Gimballed Platform 315
8.4.8 Strap-Down System 317
8.5 Combined Air Data and Inertial 317
8.5.1 Introduction 317
8.5.2 Evolution of Combined Systems 317
8.5.3 Boeing 777 Example 319
8.5.4 ADIRS Data-Set 320
8.5.5 Further System Integration 320
8.6 Radar Sensors 323
8.6.1 Radar Altimeter 323
8.6.2 Weather Radar 324
References 327
xiv Contents
9 Communications and Navigation Aids 329
9.1 Introduction 329
9.1.1 Introduction and RF Spectrum 329
9.1.2 Equipment 331
9.1.3 Antennae 332
9.2 Communications 332
9.2.1 Simple Modulation Techniques 332
9.2.2 HF Communications 335
9.2.3 VHF Communications 337
9.2.4 SATCOM 339
9.2.5 Air Traffic Control (ATC) Transponder 342
9.2.6 Traffic Collision Avoidance System (TCAS) 345
9.3 Ground-Based Navigation Aids 347
9.3.1 Introduction 347
9.3.2 Non-Directional Beacon 348
9.3.3 VHF Omni-Range 348
9.3.4 Distance Measuring Equipment 348
9.3.5 TACAN 350
9.3.6 VOR/TAC 350
9.4 Instrument Landing Systems 350
9.4.1 Overview 350
9.4.2 Instrument Landing System 351
9.4.3 Microwave Landing System 354
9.4.4 GNSS Based Systems 354
9.5 Space-Based Navigation Systems 354
9.5.1 Introduction 354
9.5.2 Global Positioning System 355
9.5.3 GLONASS 358
9.5.4 Galileo 359
9.5.5 COMPASS 359
9.5.6 Differential GPS 360
9.5.7 Wide Area Augmentation System (WAAS/SBAS) 360
9.5.8 Local Area Augmentation System (LAAS/LBAS) 360
9.6 Communications Control Systems 362
References 363
10 Flight Control Systems 365
10.1 Principles of Flight Control 365
10.1.1 Frame of Reference 365
10.1.2 Typical Flight Control Surfaces 366
10.2 Flight Control Elements 368
10.2.1 Interrelationship of Flight Control Functions 368
10.2.2 Flight Crew Interface 370
10.3 Flight Control Actuation 371
10.3.1 Conventional Linear Actuation 372
10.3.2 Linear Actuation with Manual and Autopilot Inputs 372
Contents xv
10.3.3 Screwjack Actuation 373
10.3.4 Integrated Actuation Package 374
10.3.5 FBW and Direct Electrical Link 376
10.3.6 Electrohydrostatic Actuation (EHA) 377
10.3.7 Electromechanical Actuation (EMA) 378
10.3.8 Actuator Applications 379
10.4 Principles of Fly-By-Wire 379
10.4.1 Fly-By-Wire Overview 379
10.4.2 Typical Operating Modes 380
10.4.3 Boeing and Airbus Philosophies 382
10.5 Boeing 777 Flight Control System 383
10.5.1 Top Level Primary Flight Control System 383
10.5.2 Actuator Control Unit Interface 384
10.5.3 Pitch and Yaw Channel Overview 386
10.5.4 Channel Control Logic 387
10.5.5 Overall System Integration 389
10.6 Airbus Flight Control Systems 389
10.6.1 Airbus FBW Evolution 389
10.6.2 A320 FBW System 391
10.6.3 A330/340 FBW System 393
10.6.4 A380 FBW System 394
10.7 Autopilot Flight Director System 396
10.7.1 Autopilot Principles 396
10.7.2 Interrelationship with the Flight Deck 398
10.7.3 Automatic Landing 400
10.8 Flight Data Recorders 401
10.8.1 Principles of Flight Data Recording 401
10.8.2 Data Recording Environments 403
10.8.3 Future Requirements 403
References 404
11 Navigation Systems 405
11.1 Principles of Navigation 405
11.1.1 Basic Navigation 405
11.1.2 Navigation using Ground-Based Navigation Aids 407
11.1.3 Navigation using Air Data and Inertial Navigation 408
11.1.4 Navigation using Global Navigation Satellite Systems 410
11.1.5 Flight Technical Error – Lateral Navigation 411
11.1.6 Flight Technical Error – Vertical Navigation 412
11.2 Flight Management System 413
11.2.1 Principles of Flight Management Systems (FMS) 413
11.2.2 FMS Crew Interface – Navigation Display 414
11.2.3 FMS Crew Interface – Control and Display Unit 417
11.2.4 FMS Functions 420
11.2.5 FMS Procedures 421
11.2.6 Standard Instrument Departure 423
xvi Contents
11.2.7 En-Route Procedures 423
11.2.8 Standard Terminal Arrival Routes 424
11.2.9 ILS Procedures 427
11.2.10 Typical FMS Architecture 427
11.3 Electronic Flight Bag 427
11.3.1 EFB Functions 427
11.3.2 EFB Implementation 429
11.4 Air Traffic Management 430
11.4.1 Aims of Air Traffic Management 430
11.4.2 Communications, Navigation, Surveillance 430
11.4.3 NextGen 431
11.4.4 Single European Sky ATM Research (SESAR) 432
11.5 Performance-Based Navigation 433
11.5.1 Performance-Based Navigation Definition 433
11.5.2 Area Navigation (RNAV) 434
11.5.3 Required Navigation Performance (RNP) 438
11.5.4 Precision Approaches 440
11.6 Automatic Dependent Surveillance – Broadcast 442
11.7 Boeing and Airbus Implementations 442
11.7.1 Boeing Implementation 442
11.7.2 Airbus Implementation 444
11.8 Terrain Avoidance Warning System (TAWS) 444
References 447
Historical References (in Chronological Order) 447
12 Flight Deck Displays 449
12.1 Introduction 449
12.2 First Generation Flight Deck: the Electromagnetic Era 450
12.2.1 Embryonic Primary Flight Instruments 450
12.2.2 The Early Pioneers 451
12.2.3 The ‘Classic’ Electromechanical Flight Deck 453
12.3 Second Generation Flight Deck: the Electro-Optic Era 455
12.3.1 The Advanced Civil Flight Deck 455
12.3.2 The Boeing 757 and 767 456
12.3.3 The Airbus A320, A330 and A340 457
12.3.4 The Boeing 747-400 and 777 458
12.3.5 The Airbus A380 460
12.3.6 The Boeing 787 461
12.3.7 The Airbus A350 462
12.4 Third Generation: the Next Generation Flight Deck 463
12.4.1 Loss of Situational Awareness in Adverse Operational Conditions 463
12.4.2 Research Areas 463
12.4.3 Concepts 464
12.5 Electronic Centralised Aircraft Monitor (ECAM) System 465
12.5.1 ECAM Scheduling 465
12.5.2 ECAM Moding 465
Contents xvii
12.5.3 ECAM Pages 466
12.5.4 Qantas Flight QF32 466
12.5.5 The Boeing Engine Indicating and Crew Alerting System (EICAS) 468
12.6 Standby Instruments 468
12.7 Head-Up Display Visual Guidance System (HVGS) 469
12.7.1 Introduction to Visual Guidance Systems 469
12.7.2 HVGS on Civil Transport Aircraft 470
12.7.3 HVGS Installation 470
12.7.4 HVGS Symbology 471
12.8 Enhanced and Synthetic Vision Systems 473
12.8.1 Overview 473
12.8.2 EVS, EFVS and SVS Architecture Diagrams 474
12.8.3 Minimum Aviation System Performance Standard (MASPS) 474
12.8.4 Enhanced Vision Systems (EVS) 474
12.8.5 Enhanced Flight Vision Systems (EFVS) 478
12.8.6 Synthetic Vision Systems (SVS) 481
12.8.7 Combined Vision Systems 484
12.9 Display System Architectures 486
12.9.1 Airworthiness Regulations 486
12.9.2 Display Availability and Integrity 486
12.9.3 Display System Functional Elements 487
12.9.4 Dumb Display Architecture 488
12.9.5 Semi-Smart Display Architecture 490
12.9.6 Fully Smart (Integrated) Display Architecture 490
12.10 Display Usability 491
12.10.1 Regulatory Requirements 491
12.10.2 Display Format and Symbology Guidelines 492
12.10.3 Flight Deck Geometry 492
12.10.4 Legibility: Resolution, Symbol Line Width and Sizing 494
12.10.5 Colour 494
12.10.6 Ambient Lighting Conditions 496
12.11 Display Technologies 498
12.11.1 Active Matrix Liquid Crystal Displays (AMLCD) 499
12.11.2 Plasma Panels 501
12.11.3 Organic Light-Emitting Diodes (O-LED) 501
12.11.4 Electronic Paper (e-paper) 502
12.11.5 Micro-Projection Display Technologies 503
12.11.6 Head-Up Display Technologies 504
12.11.7 Inceptors 505
12.12 Flight Control Inceptors 506
12.12.1 Handling Qualities 507
12.12.2 Response Types 507
12.12.3 Envelope Protection 508
12.12.4 Inceptors 508
References 509
xviii Contents
13 Military Aircraft Adaptations 511
13.1 Introduction 511
13.2 Avionic and Mission System Interface 512
13.2.1 Navigation and Flight Management 515
13.2.2 Navigation Aids 516
13.2.3 Flight Deck Displays 517
13.2.4 Communications 518
13.2.5 Aircraft Systems 518
13.3 Applications 519
13.3.1 Green Aircraft Conversion 519
13.3.2 Personnel, Material and Vehicle Transport 521
13.3.3 Air-to-Air Refuelling 521
13.3.4 Maritime Patrol 522
13.3.5 Airborne Early Warning 528
13.3.6 Ground Surveillance 528
13.3.7 Electronic Warfare 530
13.3.8 Flying Classroom 530
13.3.9 Range Target/Safety 530
Reference 531
Further Reading 531
Appendices 533
Introduction to Appendices 533
Appendix A: Safety Analysis – Flight Control System 534
A.1 Flight Control System Architecture 534
A.2 Dependency Diagram 535
A.3 Fault Tree Analysis 537
Appendix B: Safety Analysis – Electronic Flight Instrument System 539
B.1 Electronic Flight Instrument System Architecture 539
B.2 Fault Tree Analysis 540
Appendix C: Safety Analysis – Electrical System 543
C.1 Electrical System Architecture 543
C.2 Fault Tree Analysis 543
Appendix D: Safety Analysis – Engine Control System 546
D.1 Factors Resulting in an In-Flight Shut Down 546
D.2 Engine Control System Architecture 546
D.3 Markov Analysis 548
Simplified Example (all failure rates per flight hour) 549
Index 551
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