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<p>Aviation safety remains a critical concern as accidents continue to occur due to system failures and insufficient risk mitigation strategies. Many accidents have been related to failures in key airplane functions, highlighting the need for a structured approach to ensuring functional safety. This paper presents a systematic methodology for the allocation of functional safety requirements across various system levels by integrating Failure Modes and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) to trace failure modes from system-level functions down to subsystems and components. The method involves: (1) identifying system-level failure modes using FMEA, (2) linking system causes to subsystem failure modes using FTA, (3) analyzing subsystem failure modes with additional FMEA, and (4) synthesizing and allocating safety requirements. By integrating established safety analysis techniques, the approach enhances fault detection, and reliability. The results highlight the importance of redundancy, real-time diagnostics, and preventive measures in mitigating braking system failures. Furthermore, the study illustrates the role of structured failure causes identification in improving fault tolerance at different hierarchical levels, from system-wide safety measures to component-level design optimizations. By systematically relating corrective actions to safety requirements, this approach presents a robust framework for improving dependability and reducing hazards in aviation safety–critical systems.</p>

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Integrating multilevel failure analysis with a systematic approach to functional safety requirements allocation in aviation systems

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Ammar Chakhrit,
  • Nour El Houda Benharkat,
  • Islam H. M. Guetarni

摘要

Aviation safety remains a critical concern as accidents continue to occur due to system failures and insufficient risk mitigation strategies. Many accidents have been related to failures in key airplane functions, highlighting the need for a structured approach to ensuring functional safety. This paper presents a systematic methodology for the allocation of functional safety requirements across various system levels by integrating Failure Modes and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) to trace failure modes from system-level functions down to subsystems and components. The method involves: (1) identifying system-level failure modes using FMEA, (2) linking system causes to subsystem failure modes using FTA, (3) analyzing subsystem failure modes with additional FMEA, and (4) synthesizing and allocating safety requirements. By integrating established safety analysis techniques, the approach enhances fault detection, and reliability. The results highlight the importance of redundancy, real-time diagnostics, and preventive measures in mitigating braking system failures. Furthermore, the study illustrates the role of structured failure causes identification in improving fault tolerance at different hierarchical levels, from system-wide safety measures to component-level design optimizations. By systematically relating corrective actions to safety requirements, this approach presents a robust framework for improving dependability and reducing hazards in aviation safety–critical systems.