4. Availability

Availability is defined as the ability of a device, in terms of its reliability, maintainability, and maintenance logistics, to perform or be capable of performing a function at a given moment or within a given time interval.

This definition calls for three essential remarks.

4.1 Components of availability

"... in terms of its reliability, maintainability, and maintenance logistics..." : availability is the result of these three components (see figure 3 ).

It is easy to understand that the higher the reliability and maintainability (respectively, fewer failures and shorter repair...

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Availability