Article | REF: MT9200 V1

Operational reliability - Concepts and issues

Author: Jean FAUCHER

Publication date: October 10, 2008

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4. Availability

Availability is defined as the ability of a device, under the combined aspects of its reliability, maintainability and maintenance logistics, to perform or be in a condition to perform a function at a given time or within a given time interval.

This definition calls for three essential comments.

4.1 Availability components

"... under the combined aspects of its reliability, maintainability and maintenance logistics...". Availability is the result of these three components (see figure 3 ).

It's easy to see that the higher the reliability and maintainability (fewer failures and shorter...

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