What stands for MTTR ? How to calculate ?

MTTR is Mean Time To Repair

Average time (e.g. in hours) between the occurrence of an incident and its resolution.

MTTR stands for Mean Time To Repair

MTTR is the average time that it takes to repair something after a failure

MTTR = (Total down time) / (number of breakdowns)

Mean Time To Repair = (Total down time) / (number of breakdowns)

Mean time to repair (MTTR) is the average time required to troubleshoot and repair failed equipment and return it to normal operating conditions. It is a basic technical measure of the maintainability of equipment and repairable parts. Maintenance time is defined as the time between the start of the incident and the moment the system is returned to production i.e. how long the equipment is out of production. This includes notification time, diagnostic time, fix time, wait time (cool down), reassembly, alignment, calibration, test time, back to prod etc. It generally does not take into account lead-time for parts. MTTR reflects how well an organization can respond to a problem and repair it.

Expressed mathematically, it is the total maintenance time divided by the total number of maintenance actions over a specific period.

Over the lifetime of an asset, each failure will vary depending on the severity of the issue. Some issues will require a simple parts swap while others could take days to diagnose and repair. The frequency V repair time plot follows the lognormal distribution. We will have a large number of repairs that are quick to repair, and a small number that take much longer.

MTTR, Mean Time To Restore. 

MTTR, Mean Time To Repair. 

MTTR, Mean Time To Recovery. 

MTTR, Mean Time to Respond.

MTTR is often part of a maintenance contract, where a system whose MTTR is24 hours is generally more valuable than for one of7 days if mean time between failures is equal, because its Operational Availability is higher.

The formula used is MT BF = total no of machines(total available hours-total B/D Hours)/total number of B/D 's.

Expressed mathematically, it is the total maintenance time divided by the total number of maintenance actions over a specific time period

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Agree with  Alex Al Yazouri 

Mean Time To Repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device. Expressed mathematically, it is the total corrective maintenance time divided by the total number of corrective maintenance actions during a given period of time. It generally does not include lead time for parts not readily available or other Administrative or Logistic Downtime (ALDT).

MTTR means Mean Time To Repair.It can be calculated by the formula:MTTR= total maintenance time/number of repairs