Mean Time to Repair MTTR

MTTR – Mean Time To Repair calculation = total downtime ÷ number of stops

It is part of the maintenance service analysis ratios.

It measures the average time required to repair a failed component or device.

→ Maintenance dashboard

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Maintenance KPIs

Here are the main KPIs for the Maintenance. They are part of the Maintenance Dashboard or Balanced Scorecard.

Please see the following table.

-> Recommended bibliography about maintenance KPIs

Activity Subject Calculation
Cost Maintenance cost vs last year vs budget Maintenance cost vs last year vs budget
Maintenance, repair and operating supplies (MRO) Value of the items that are used in maintenance activities (maintenance supplies, spare parts, oils, lubricants, gloves, safety equipment, cleaning products….)
Maintenance cost as % of COGS Maintenance cost ÷ COGS
Maintenance cost as % of assets replacement cost Maintenance cost ÷ replacement asset value for plants and equipments
Maintenance cost as % of manufacturing cost Maintenance cost ÷ manufacturing cost
Average maintenance cost per unit manufactured Maintenance cost ÷ total unit manufactured
Preventive maintenance cost as % of total maintenance cost Preventive maintenance cost ÷ total maintenance cost
Corrective maintenance cost as % of total maintenance cost Corrective maintenance cost ÷ total maintenance cost
Maintenance Planned maintenances as % of global maintenance Number of planned maintenances orders ÷ total number of maintenances orders
Unplanned maintenances as % of global maintenance Number of unplanned maintenances orders ÷ total number of maintenances orders
Critical Equipment availability Number of critical equipments available ÷ total critical equipments
Equipment availability Actual operating productive time
Overall Equipment Effectiveness OEE Availability ratio x Performance ratio x Quality ratio
Availability ratio OEE Actual production time ÷ Theoretical production time
Performance ratio OEE Cycle time x Actual Production÷ Actual Production time
Quality ratio or Yield OEE (Actual Production – Rejected Production)÷ Actual Production
Quality Maintenance rework as % of total maintenance actions Number of maintenance action that is a repeat of a previous ÷ total number of maintenance actions
Downtime Time with equipment unavailable ÷ total operating time
Total of unscheduled maintenance downtime
Total of scheduled maintenance downtime
Mean-time Between Failure MTBF (running time – downtime) ÷ number of failures
Service Time to answer maintenance calls Average time taken to answer the calls
Time from call to resolution Average time from call to resolution
Mean Time to Repair MTTR Average time between the occurrence of an incident and its resolution
Maintenance backlogs as % of total maintenance orders Number of maintenance orders in backlog ÷ total number of maintenance orders
HR Maintenance hours as % of total production operating time Number of hours spent on maintenance ÷ total production operating time
Preventive maintenance Number of hours used for preventive maintenance ÷ total maintenance hours
% of men hours used for preventive maintenance
Scheduling Number of actual maintenance hours ÷ total maintenance hours planned
Scheduled man hours ÷ total man hours
Work orders delayed for lack of manpower Number of work orders delayed because of lack of manpower ÷ total number of work orders

Recommended bibliography

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