What is MTTR?
Mean time to repair (MTTR) is a maintenance metric that measures the average time required to troubleshoot and repair failed equipment. It reflects how quickly an organization can respond to unplanned breakdowns and repair them.
MTTR calculates the period between the start of the incident and the moment the system returns to production.
Mean time to repair (MTTR): As described above, MTTR is the average time it takes for a failed system to be fixed and restored to full functionality. It is a relative measure, and therefore, depending on the system, could be measured in anything from minutes to days.
This takes into account the time to:
1.Notify technicians
2.Diagnose the issue
3.Fix the issue
4.Allow the equipment to cool down
5.Reassemble, align, and calibrate the asset
6.Set up, test, and start up the asset for production
Calculate MTTR by adding up the total time spent on repairs during any given period and then dividing that time by the number of repairs.
Mean Time To Repair = (Total downtime) / (number of failures)
MTTR Example :
Over a period of time the following information is available:
Total Production Time (PT): 1,240 minutes
Total Downtime (DT): 1.5 hours (watch the unit of measures)
Number of Failures (F): 25
Determine the MTTR:
MTTR = Total Downtime / Number of Failures = 90 minutes / 25 failures
MTTR = 3.6 minutes per failure