Glossary Content

OPERATING STATUS

FULLY OPERATIONAL

inherent availability
Availability of a system with respect only to operating time and corrective maintenance.AI ignores standby and delay times associated with preventive maintenance as well as Mean Logistics Delay Time (MLDT) and may be calculated as the ratio of Mean Time Between Failure (MTBF) divided by the sum of MTBF and Mean Time To Repair (MTTR), that is: AI = MTBF ÷ (MTBF + MTTR)
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inherent availability