This chapter discusses safety concepts in relation to the architecting of avionics systems. Rather than provide a detailed discussion of all the aspects of flight safety the chapter sets these principles in the context of architecting avionics systems to meet the flight safety objectives of the air vehicle. The architecture descriptions offered broadly outline the main candidate architectures and implementations, though in practice there may be considerable subtleties in specific implementations.
The chapter explores the differences between reliability, available, integrity and dispatch availability and outlines the safety assessment process, hazard analysis (the safety case) and the inverse relationship between the probability of failure and the consequent severity of the effects on the air‐vehicle and its occupants. This allows the system designer to develop a means to architect fault tolerant systems and meet the systems safety objectives. It develops the mathematical basis for and provides examples of statistical analysis methods for analysing the consequences of random failures namely, dependency diagrams, fault tree analysis and Markov analysis. It reviews the means to assess and demonstrate component reliability.
During the engineering design phase the system architect devises system concepts employing various levels of redundancy that provide the necessary levels of system performance, availability and safety. These architectures are carefully crafted and reviewed using an Industry‐wide series of methodologies, tools and techniques that allow the provisional system design to be evaluated and to give a high degree of confidence that the eventual final design will meet its safety objectives. These tools enable a range of possible architectures to be evaluated that may be invoked to meet the system design requirements.
System Safety
Civil Avionics Systems ; 119-157
2013-08-27
39 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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