SAE ARP 4761: Guidelines and Methods for Conducting the

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Electrical System Loss c. 2 Failure Condition Determination Considering Single and Multiple Failures: The creation of the single failure list involves examining the original list created in the previous steps and, in addition, applying an analysis of the concept design created in the initial design process. The creation of the multiple failure list is more difficult as it requires an understanding of the integration of the system components and the interaction of the system being analyzed with other systems on the aircraft.

If, in the above figure, the first and second elements of the system must fail prior to the Nth element in order for the EVENT to occur, then the AND-gate may include another Undeveloped Event input which represents the probability that the “n” elements will fail in that order. Another way to represent failure order events dependent events is to use a PRIORITY AND-gate along with a Conditional Event. 4. For example, assume the above system has three elements. The fault tree’s first tier would be drawn as in Figure D5.

B. The safety requirements (qualitative and quantitative) allocated to items (both hardware and software). c. ). d. The hardware and software Development Assurance Levels. e. The safety maintenance tasks and associated “Not to Exceed” times. Failure modes and associated probability budgets identified in PSSA Fault Tree Analysis should be used as requirements to drive the lower level detailed studies. 1 Documentation: The results of the PSSA process should be documented so that there is traceability of the steps taken in developing the PSSA reports.

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