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(Failure modes Effects and Criticality Analysis FMECA);

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S = (MTBF,MTTR,RST,MTBA,MTBR,ROA,RML),

MTBF (Mean Time between Failures) ; MTTR (Mean Time to Repair) ; RST (Required Standby Time) ( ) ; MTBMA (Mean Time between Maintenance Actions) ; MTBR (Mean Time between Removals) ; ROA (Required Operational Availability) ; RML (Required Maintenance Level) .

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