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Recent content by tb2944

  1. tb2944

    Using DAL to show compliance to 2x.1309 probability requirement

    Many thanks. I will use the fault trees to support my qualitative argument that equipment DALs are appropriate to the function. I see that it would be inappropriate to use DALs to support calculation of the overall reliability of the function.
  2. tb2944

    Using DAL to show compliance to 2x.1309 probability requirement

    I am creating a Fault Tree Analysis for a Part 29 rotorcraft glass cockpit modification. The purpose is to verify compliance to 29.1309 – the design is frozen so unfortunately there is no scope to use the FTA for reliability/DAL allocation. I know ARP 4754/4761, have a basic knowledge of FTA...
  3. tb2944

    Requirements change management - your approach/software

    I'd be interested in how your companies approach requirements change management. That is, proper control of iterative changes during development, eg, in response to test failures. I'm interested in: • Option appraisal • Governance of decision (particularly between different teams) • Control of...
  4. tb2944

    Proving hazardous relative motion <1E-9

    Thanks for the suggestions. I will take survivable crash load factors from the FAR. The difficult bit is to argue a probability of failure based on (maybe) crash load distribution and material allowables. Clearly the published ultimate crash load factors already contain a safety factor (1.5?)...
  5. tb2944

    Proving hazardous relative motion <1E-9

    Hi All, This concerns relative motion between an aircraft system and the local structure, during a crash, which could cause a hazard. This requires an explicit demonstration by a combination of test, analysis and experience that the probability of the hazard occurring is < 1E-9. I will...
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