Determining Checkout Intervals for Systems Subject to Random Failures

by Milton Kamins

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A method for determining appropriate time intervals between periodic checkouts for strategic, defense, and possibly tactical systems that have an exponential failure distribution. Algebraic equa- tions are presented that express the relationship of time between checkouts to in-commission rates and costs. These equations are used to find the checkout interval that results in the maximum value of the readiness-to-cost ratio. The analysis is then extended to cover smaller groupings, such as subsystems or even components. Finally, monitored or continuous checkout is examined and compared with checkout at the preferred periodic intervals determined previously. A large number of examples are evaluated and summarized in graphic form, so that use of the method does not usually require extensive computations. 90 pp

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