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What is an MTTR indicator?

Measuring the overall effectiveness of the production processes as well as of the entire TPM system (TPM: Total Productive Maintenance) is possible only when based on effectiveness markers, or the KPIs (Key Performance Indicators). The KPIs allow the companies to verify the progress and the trend estimate within the machine park. One of the basic KPIs of significant meaning for the maintenance service is precisely the MTTR indicator (MTTR: Mean Time To Repair).

What do you need the MTTR indicator for?

The MTTR indicator describes the time on average- the mean time, from the moment a failure occurs to the moment the equipment starts working again. Which is why its use has such a significant impact on the trend estimate when it comes to effectiveness and speed of failure removal.

The MTTR indicator is usually utilized in the context of the TPM management
program, although it can also be employed regardless of the management program in use.

The mean time from the moment the failure took place to the moment of its removal is a significant marker, especially for the maintenance service team at manufacturing facilities. It allows to monitor the effectiveness of the undertaken repair actions, which in turn impacts the availability of the machines.

How is the MTTR indicator measured?

The MTTR indicator is determined by dividing the total maintenance time by the total number of failures that occurred.
The final result is represented in minutes or in hours. In practice, it is described as mean time to repair.

For example: in a certain time period during the machine use, two failures occurred. The first one lasted 4 hours and the second one- 2 hours.
Based on that data, we can calculate that the MTTR indicator- so the mean time
of the failure was 3 hours.
That is because: (4+2) h/2= 3h

You can find out more about effectiveness indicators in our articles where each
one of them has been described thoroughly.

Find out more:

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