MTTR (Mean Time to Repair)
The average time from failure to restored operation — the standard measure of maintainability and response.
MTTR is total repair time divided by the number of repairs. It measures how quickly the organization restores a failed asset, and it decomposes into stages worth measuring separately: time to detect the failure, time to respond, time to diagnose, time waiting for parts, and hands-on repair time. Teams that only track the total often discover, when they decompose it, that waiting — for parts, for access, for approvals — dwarfs actual wrench time.
MTTR improvements are usually organizational rather than technical: critical spares stocked on site, documented procedures and photos attached to asset records, mobile access to history so diagnosis starts before the toolbox opens, and clear escalation paths. Sensor-based detection attacks the front of the clock, cutting the hours a failure runs undetected on unattended equipment.
Together with MTBF, MTTR determines availability: assets fail rarely (high MTBF) and recover fast (low MTTR), or the operation suffers. The two metrics point at different owners — reliability engineering owns MTBF, maintenance operations largely owns MTTR — which is why reporting them separately beats blending them.
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