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  1. s170609

    MTBUR/MTBF for variable populations

    Thanks IRstuff, that's a good piece of info :)
  2. s170609

    multipliation rule for independent variables

    I'm a little confused as well. Do you mean "tolerance" or "probability"? Are you are refering to system reliability (X) with four different failure modes (a,b,c,d) and their probability values? You may be in the wrong forum if your are asking about mass/weight and tolerances rather than...
  3. s170609

    MTBUR/MTBF for variable populations

    Thanks for your Help. Although FranAle you may have missed the point. My population is already homogenous - I'm not talking about all components from all aircraft systems (ata chapters); I'm talking about calculations where that population varies within the time period. Current formulas used...
  4. s170609

    MTBUR/MTBF for variable populations

    Gents, I am trying to establish the best method for working out MTBUR when the component population varies within the time period. An example is when an aircraft comes into, or leaves service mid-year. When caculating the MTBUR for a group of components, their number changes as well as the...

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