Mean Time to Repair (MTTR)
Mean Time to Repair (MTTR) measures the average time required to diagnose and fix a failed asset and return it to operational status. It includes diagnosis, sourcing parts, performing the repair, and testing. MTTR is typically calculated by dividing the total repair time across all failures by the number of failure events in a given period.
Why it matters
A high MTTR indicates inefficiencies in the repair process, such as difficulty diagnosing faults, slow parts procurement, or inadequate technician skills. Reducing MTTR directly increases asset availability and reduces the operational impact of each failure. When combined with MTBF, MTTR provides a comprehensive picture of maintenance effectiveness and asset reliability.
How MapTrack helps
MapTrack captures repair start and completion times on every work order, providing accurate MTTR data that helps teams identify bottlenecks and improve repair turnaround times.
Frequently asked questions
What factors increase MTTR?
Common factors that inflate MTTR include lack of diagnostic information, unavailable spare parts, insufficient technician training, poor access to service history, and administrative delays in work order approval. Geographic remoteness on mining or civil sites can also significantly increase repair times due to parts and specialist travel logistics.
How can teams reduce MTTR?
Effective strategies include maintaining accurate service histories so technicians can diagnose faults faster, stocking critical spare parts on-site, providing mobile access to manuals and procedures, and ensuring work orders contain all necessary information before a technician is dispatched. Standardising repair procedures for common failure modes also helps.
Related terms
Mean Time Between Failures (MTBF)
Mean Time Between Failures (MTBF) is a reliability metric that measures the average elapsed time between inherent failures of a repairable system during normal operation. It is calculated by dividing the total operational time by the number of failures over a given period. MTBF is typically expressed in hours and is used to compare the reliability of assets, components, or equipment models.
Downtime
Downtime is any period during which an asset is unavailable for its intended function. It can be planned (scheduled maintenance, shutdowns, inspections) or unplanned (breakdowns, failures, waiting for parts). Downtime is typically measured in hours and expressed as a percentage of total available time, providing a key indicator of asset availability.
Corrective Maintenance
Corrective maintenance refers to repair or restoration work carried out after a fault, defect, or failure has been identified in an asset. It may be triggered by an operator report, a failed inspection, or an unexpected breakdown. Corrective tasks range from minor adjustments to major overhauls, depending on the severity of the issue.
Work Order
A work order is a formal document or digital record that authorises and tracks a specific maintenance task. It typically includes the asset identification, description of work required, priority, assigned technician, parts needed, safety requirements, and completion details. Work orders provide a structured workflow from request through approval, execution, and closeout.
Spare Parts Management
Spare parts management is the process of planning, procuring, storing, and issuing replacement components and consumables needed to maintain and repair assets. It involves determining which parts to stock, setting minimum and reorder quantities, managing supplier relationships, and ensuring parts are available when needed without carrying excessive inventory. Effective spare parts management balances availability against holding costs.
See how MapTrack handles mean time to repair (mttr)