Reliability - Downtime from MTBF/MTTR
System availability A = MTBF / (MTBF + MTTR) and annual downtime hours - the baseline uptime metric for critical marine equipment.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Mean time between failures | h | |
| Mean time to repair | h |
Source: IEEE 493 / MIL-HDBK-217
In short
System availability A = MTBF / (MTBF + MTTR) and annual downtime hours - the baseline uptime metric for critical marine equipment.