Mean Time To Repair (MTTR)

MTTR measures the average time it takes to repair a failed asset or system. It indicates how quickly issues are resolved. A lower MTTR implies faster and more efficient repairs, while a higher MTTR suggests slower repair times (and longer downtime).

Several factors can influence MTTR, including the complexity of the repair, the availability of spare parts, technicians’ skill level, and the efficiency of maintenance processes.

In most cases, the goal is to keep MTTR as low as possible. A lower MTTR generally indicates efficient maintenance practices, reduced downtime, and improved equipment availability.

MTTR varies depending on the specific asset, industry, and maintenance goals. In some cases, a higher MTTR may be acceptable or even expected due to the complexity of equipment or safety considerations.

• Calculate MTTR regularly to track changes in repair performance over time. Frequent assessments can help identify trends and areas for improvement.
• MTTR should only consider unplanned downtime and repairs. Exclude any scheduled maintenance activities or planned downtime from your calculations.
• MTTR can be calculated for a single asset or a group of assets. Determine the scope of what you want to measure. Are you calculating it for specific equipment, an asset group, a facility or plant, or the organization as a whole? Define the scope in advance.
• If you notice a consistent increase in MTTR, conduct root cause analysis to identify the reasons behind prolonged repair times. Addressing these root causes can lead to shorter repair times.
• Maintain a historical record of MTTR calculations in your CMMS to monitor trends and performance over time. Historical data helps with trend analysis and decision-making.
• Compare your calculated MTTR values with industry benchmarks and organization's historical data if available.