| the ability of an item to be in a state to perform a required function under given conditions at a given instant of time or over a given time interval, assuming that the required external resources are provided
NOTE 1 – This ability depends on the combined aspects of the reliability performance, the maintainability performance and the maintenance support performance.
NOTE 2 – Required external resources, other than maintenance resources do not affect the availability performance of the item.
NOTE 3 – In French the term “disponibilité” is also used in the sense of “instantaneous availability”.
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