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On The Specification of Repair Time Requirements

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2 Author(s)
Sherrie E. Emoto ; Bldg. 606, M/S K210; Hughes Aircraft Co.; Box 3310; Fullerton, CA 92634 USA. ; Ray E. Schafer

When specifying maintainability requirements, it is widely accepted practice (virtually universal in US military and DoD specifications) to specify the mean-time-to-repair and a `maximum' quantile of the repair time distribution. This practice is unsatisfactory for the lognormal distribution of repair times because: 1) As is well-known, it may be that for a given pair (mean, quantile) there is no lognormal distribution. 2) As is not so well-known, for a given pair (mean, quantile) there will be two lognormal distributions, if there are any. In short, the specification of a mean and a quantile does not uniquely determine a single lognormal distribution.

Published in:

IEEE Transactions on Reliability  (Volume:R-29 ,  Issue: 1 )