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starship-design: Mean Time Between Failure

Kelly wrote:

>The mean unrepaired service life of a systems is less then the mtbf of
>any of its parts.  The higher percentage of parts with MTBF less then
>the desired service life, the higher liklyhood failure before then.

So after the shortest MTBF, other MTBFs will accumulate. The result will be
that the chance for a failure to happen increases much faster than for a
single part that has a short MTBF.