Availability (quantitative)

From International Dictionary of Marine Aids to Navigation
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5-1-030

The probability that a system will be available for operation at an arbitrarily chosen instant in the future. It may be expressed as the ratio MTBF/(MTBF + MTTR).




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

Mean Time Between Failures

Mean Time to Repair

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM