Definition
MTTR describes how quickly an organization responds to repairable failures and restores operation. It is commonly calculated as total repair time divided by the number of completed repairs.
Key facts
- A clear definition of start, finish, and included waiting time is essential.
- A low value can indicate effective diagnosis, parts availability, and workflows.
- The average should also be analyzed by asset and failure type.
- MTTR measures repair speed, not failure frequency.
How is MTTR (Mean Time to Repair) calculated?
Add the repair time defined by the organization and divide it by the number of corresponding repairs. Teams must decide whether diagnosis, material waits, approvals, and restart are included.
What influences MTTR (Mean Time to Repair)?
Information access, diagnostic skill, spare parts, tools, escalation paths, and the quality of previous documentation directly affect repair duration.
How should teams interpret MTTR (Mean Time to Repair)?
A single average can hide long individual events. Distributions, outliers, and comparisons within similar asset classes usually reveal more than one site-wide number.