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The role of safety architectures in aviation safety cases

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  • Denney, Ewen
  • Pai, Ganesh
  • Whiteside, Iain

Abstract

We develop a notion of safety architecture (SA), based on an extension to Bow Tie Diagrams (BTDs), to characterize the overall scope of the mitigation measures undertaken to provide safety assurance at both design time and during operations. We motivate the need for SAs, whilst also illustrating their application and utility in the context of aviation systems, through an example based upon a safety case for an unmanned aircraft system mission that successfully underwent regulatory scrutiny. We elaborate how SAs fit into our overall safety assurance methodology, also discussing the key role they play in conjunction with structured assurance arguments to provide a more comprehensive basis for the associated safety case. We give a formal semantics as a basis for implementing both BTDs and SAs in our assurance case tool, AdvoCATE, describing the functionality afforded to support both the related safety analysis and subsequent development activities, e.g., enforcement of well-formedness properties, computation of residual risk, and model-based views and transformations.

Suggested Citation

  • Denney, Ewen & Pai, Ganesh & Whiteside, Iain, 2019. "The role of safety architectures in aviation safety cases," Reliability Engineering and System Safety, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:reensy:v:191:y:2019:i:c:s0951832018304782
    DOI: 10.1016/j.ress.2019.106502
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    References listed on IDEAS

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    1. Duijm, Nijs Jan, 2009. "Safety-barrier diagrams as a safety management tool," Reliability Engineering and System Safety, Elsevier, vol. 94(2), pages 332-341.
    2. Rae, Andrew & Alexander, Rob & McDermid, John, 2014. "Fixing the cracks in the crystal ball: A maturity model for quantitative risk assessment," Reliability Engineering and System Safety, Elsevier, vol. 125(C), pages 67-81.
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    Cited by:

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    2. Chelouati, Mohammed & Boussif, Abderraouf & Beugin, Julie & El Koursi, El-Miloudi, 2023. "Graphical safety assurance case using Goal Structuring Notation (GSN) — challenges, opportunities and a framework for autonomous trains," Reliability Engineering and System Safety, Elsevier, vol. 230(C).
    3. Dai, Wei & Quek, Zhi Hao & Low, Kin Huat, 2024. "Probabilistic modeling and reasoning of conflict detection effectiveness by tracking systems towards safe urban air mobility operations," Reliability Engineering and System Safety, Elsevier, vol. 244(C).

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