MTTR

MTTR is an abbreviation that has several different expansions with greatly differing meanings. It is wise to spell out exactly what is meant when using it, rather than assuming the reader will know which is being used.

The M can stand for any of minimum, mean or maximum, and the R can stand for any of recovery, repair, respond, or restore. The most common, mean, is also subject to interpretation, as there are several ways to calculate a mean.

In an engineering context with no explicit definition, the engineering figure of merit, mean time to repair would be the most probable intent by virtue of seniority of usage. It is also similar in meaning to the others above (more in the case of recovery, less in the case of respond, the latter being more properly styled mean "response time").

In Lean Manufacturing MTTR [ Mean time to repair ] or Average time to repair, is a simple metric used to gauge how fast a machine is repaired with respect to failures. A quick calculation can be made which is MTTR = [ total time of repair / Total # of failures ], For example ( 1 day + 2 days ) / 2 Failures = 1.5 Days : The metric includes the history of the failed asset. To calculate the metric you can go back in history of the machine as little as days, weeks, months or yearly. As a good practice the metric would be more meaningful if you would include at least 2 months of data. The metric can be used to gauge how effective Maintenance is in terms of problem solving, part availability, root cause analysis, etc.

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