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Additional resources for SAE ARP 4761: Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment

Example text

F. Demonstrate that the aircraft performs as expected with the given failure conditions. 1 Validation of Failure Condition Classification: Traceability should be demonstrated between requirements established in the FHA/PSSA and the documents in which these requirements are specified. These documents include the following items. a. b. c. d. e. ) Maintenance manual Common Cause Analyses documents On method of accomplishing this task would be to create a matrix showing the requirements and the substantiation of their corresponding validations.

4. Gather the most complete system data available at the time and analyze it to determine the possible fault and failure events and event combinations which lead to the top event. 8 contains more information on this step. 5. Construct the fault tree associated with the undesired event from Step 3. 9 contains information on fault tree construction. 6. Analyze and summarize the FTA results. 13 contain more information on analyzing fault trees and summarizing their results. 6 FTA ANALYSIS DEFINITION: The fault tree can be used to accomplish the main goals listed below.

Verify compliance with established PSSA FTA objectives. The analyst can work either goal at any indenture level within the system. An indenture level is defined as any one level within a multi-level FTA. The analyst will need to determine the boundary for the FTA. The boundary will be subjectively based on what the analyst wants or needs to accomplish by performing the FTA. Table D1 lists several possible indenture levels and their potential boundaries. , the lowest level of design detail that the analyst will consider when performing the "top-down” FTA).

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