System Design and Development in .NET

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System Design and Development
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11.1.1 Systems Design
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There are references to some of the better known speci cations and requirements, but this chapter also attempts to act as a tutorial in terms of giving examples of how the various design techniques and methods are applied. As the complexity and increasing interrelationship and reliance between aircraft systems has progressed it has become necessary to provide a framework of documents for the designer of complex aircraft systems.
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11.1.2 Development Processes
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An overview of a typical life cycle for an aircraft or equipment is given and the various activities described. Further, some of the some of the programme management disciplines are brie y visited.
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11.2 System Design
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Key documentation is applied under the auspices of a number of agencies. A list of the major documents which apply are included in the reference section of this chapter and it is not intended to dwell on chapter and verse of those documents in this brief overview. There are several agencies who provide material in the form of regulations, advisory information and design guidelines whereby aircraft and system designers may satisfy mandatory requirements.
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11.2.1 Key Agencies and Documentation
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These agencies include: Society of Automobile Engineers (SAE): ARP 4754 [1] ARP 4761 [2] Federal Aviation Authority (FAA): AC 25.1309-1A [3] Joint Airworthiness Authority (JAA): AMJ 25.1309 [4] Air Transport Association (ATA): ATA-100 [5] Radio Technical Committee Association (RTCA): DO-178b [6] DO-254 [7] This list should not be regarded as exhaustive but merely indicative of the range of documentation which exists.
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11.2.2 Design Guidelines and Certi cation Techniques
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References 1 and 2 offer a useful starting point in understanding the interrelationships of the design and development process: Def Stan 00-970 for military aircraft Figure 11.1 shows the interplay between the major techniques and processes associated with the design and development process.
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Safety Assessment Process Guidelines & Methods (ARP 4761)
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Intended Aircraft Function Function, Failure & Safety Information System Design
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System Development Processes
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(ARP 4754)
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Aircraft System Development Process Hardware Life-Cycle Process Functions & Requirements
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Implementation
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Hardware Development Life-Cycle (DO-254)
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Software Life-Cycle Process
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Software Development LifeCycle (DO-178B)
ARP 4754 system development process
This gure which is presented as part of the SAE ARP 4761 document gives an overview of the interplay between some of the major references/working documents which apply to the deign and development process. In summary: ARP 4761 represents a set of tools and techniques ARP 4754 is a set of design processes DO-254 offers guidance for hardware design and development DO-178B offers advice for the design and certi cation of software
The key elements of these documents may be summarised by listing the main subject headings.
System Design and Development
11.2.3 Key Elements of the Development Process
System Development Processes ARP 4754 System development Certi cation process and coordination Requirements determination and assignment of development assurance level Safety assessment process Validation of requirements Implementation veri cation Con guration management Process assurance Modi ed aircraft
Methodologies and Techniques ARP 4761 Functional Hazard Assessment (FHA) Preliminary System Safety Analysis (PSSA) System Safety Analysis (SSA) Fault Tree Analysis (FTA) Dependency Diagrams Markov Analysis (MA) Failure Modes and Effects Analysis (FMEA) Failures Modes and Effects Summary (FMES) Zonal Safety Analysis (ZSA) Particular Risks Analysis (PRA) Common Mode Analysis (CMA) Contiguous safety assessment process example
DO-178B Overview Design Assurance for Airborne Software [1 December 1992] Introduction System Aspects relating to Software Development Software Life Cycle Software Planning Process Software Development Process Software Veri cation Process Software Con guration Management Process Software Quality Assurance Process Certi cation Liaison Process Overview of Aircraft and Engine Certi cation Software Life Cycle Data Additional Considerations
Major Safety Processes
DO-254 Overview Design Assurance Guidance for Airborne Electronic Hardware [April 2000] Introduction System Aspects of Hardware Design Assurance Hardware Design Life Cycle Planning Process Validation and Veri cation Process Con guration Management Process Process (Quality) Assurance Certi cation Liaison Hardware Design Life Cycle Data Additional Considerations
The correspondence of these documents to EUROCAE ED documents is given in Table 11.1. Table 11.1 Correspondence of US RTCA and EUROCAE documents
Speci cation Topic Systems Development Processes Safety Assessment Process Guidelines & Methods Software Design Hardware Design Environmental Test US RTCA (1) Speci cation SAE 4754 SAE 4761 DO-178B DO-254 DO-160 ED-12 ED-80 ED-14 European EUROCAE (2) Speci cation ED-79