Time-Specific Measures
The following table lists time-specific RBD measures and references topics providing the equations for calculating these results where necessary.
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The term hazard rate is used for conditional failure intensity. For non-repairable systems, the hazard rate is equivalent to the failure rate. For repairable systems, the hazard rate is equivalent to the rate of failure of the system at a specified time given that the system is operational at that time.
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Result
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Equation Reference
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Reliability (also Unreliability)
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Availability (also Unavailability)
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Mean availability
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Failure rate
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Hazard rate
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Failure frequency
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Total downtime
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Expected number of failures
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Mean capacity
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Labor cost
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Spares cost for storage and usage
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Miscellaneous cost
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Downtime cost (for the system)
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Total cost
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Total time waiting for spares (only for blocks)
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Total time waiting for labor (only for blocks)
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Labor cost
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Spares cost for storage and usage
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