The reliability calculations given in the previous chapter are based upon the assumption that the failure rates of the components do not vary with time. Although this assumption leads to the simplest prediction techniques it is permissible only if it represents fairly accurately the measured behaviour of components in a working system. In general terms the assumption may not hold for mechanical components, but is a good approximation for electronic components, particularly since the introduction of transistors in place of valves.
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- Component Failure Data
J. C. Cluley
- Macmillan Education UK