Mttr
Mean Time to Repair (MTTR) is the average time required to restore a failed asset to fully operational capability, measuring maintainability and repair process efficiency. Calculated as total repair time divided by total failures, it includes detection, diagnosis, and fixing time, but excludes parts lead time and administrative/logistic downtime.
In shop floor maintenance, MTTR is tracked via CMMS repair logs to benchmark technician performance and schedule preventive maintenance. It is used to calculate asset availability (Availability = MTBF / (MTBF + MTTR)), helping prioritize repairs for critical equipment. By analyzing MTTR by failure type and asset criticality, maintenance teams can identify inefficiencies, reduce downtime, and improve overall equipment effectiveness (OEE).
How does MTTR differ from Mean Time to Recovery?
In industrial contexts, MTTR equals repair time; in IT/SRE, MTTR often means recovery time including validation, but both use the same formula.
What is the target MTTR for a critical pump?
Target depends on criticality; for high-availability assets, MTTR should be less than 2 hours, but this requires segmenting data by failure category like bearing vs. seal.
Can MTTR be reduced by increasing preventive maintenance?
Yes—reducing failure frequency (MTBF) doesn't lower MTTR, but improving fault diagnosis speed and crew readiness directly cuts repair time.