Mean Time To Repair (MTTR)

Mean time to repair is the average time taken to restore a failed asset to working order, from the moment of failure to the resumption of normal operation. Reducing MTTR improves availability without preventing failures.

MTTR captures everything in the repair cycle: diagnosis, securing parts, the physical repair and testing before restart. It complements MTBF, since availability depends on both how often equipment fails and how quickly it is fixed. Shortening MTTR through better diagnostics, accessible design, ready spares and trained crews is often a faster route to higher uptime than chasing rare failures, particularly for assets where some failure is unavoidable.

Related terms

Mean Time Between Failures (MTBF) · Wrench Time · Spare Parts Optimisation