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    My ?: I can see how one can allocate downward reliability however having trouble grasping how anything with maintainability can also be allocated downward. I can see allocating reliability to the lower levels and then adding in respective downtime at that level to calculate Ao but again - allocating Ao? Do? Tough one for me. Can you comment please?


    Answer

    Operational Availability can be allocated from the Top Down.
     
    See https://acc.dau.mil/CommunityBrowser.aspx?id=637655 for a model developed to do just that.  Note that a link is provided identifying contact information of the owner of the model.  They should be able to speak more in-depth as to the algorithms used to perform the calculations.

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