SYSTEM SAFETY ASSESSMENT (SSA)

The System Safety Assessment is a safety assessment technique defined in SAE ARP4761.

The System Safety Assessment is a systematic, comprehensive evaluation of the implemented system to show that qualitative (system development assurance levels, item development assurance levels, hardware design assurance levels and software levels) and quantitative (safety-related reliability targets) safety requirements, defined in the Functional Hazard Assessment (FHA) and Preliminary System Safety Assessment (PSSA) have been met.

The System Safety Assessment integrates the results of the various analyses to verify the overall safety of the system and to cover all the specific safety considerations identified in the PSSA.  The SSA process documentation includes results of the relevant analyses and their substantiations as needed.  Depending on the content of the SSA it has either represented the Safety Case for the system or been used as input/major contributor to the Safety Case.

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