Planned Maintenance is the deliberate design of maintenance activities to control equipment failure risk and support reliable operation. Within TPM, it complements Autonomous Maintenance by focusing technical maintenance resources on the work that requires specialist knowledge, planning and deeper equipment analysis.
The goal is not to maximize the number of preventive maintenance tasks.
The goal is to choose maintenance strategies that match equipment criticality and failure behavior.
Start with equipment criticality
Not every asset deserves the same level of maintenance effort.
Criticality considers the consequence of failure.
Safety, environmental impact, quality, throughput, customer service, repair time and cost can all influence the decision.
A highly critical asset may justify stronger monitoring, spare-parts planning and preventive controls than a low-consequence component.
Understand failure modes
Maintenance strategy should be connected to how the equipment can fail.
Some failure modes are age-related and may be suitable for scheduled replacement.
Others develop gradually and can be detected through condition monitoring.
Some failures are random and may not benefit from frequent replacement.
Understanding the failure mechanism helps avoid routine tasks that add cost without reducing risk.
Preventive, condition-based and predictive approaches
Time-based preventive maintenance performs work at a defined interval.
Condition-based maintenance acts when inspection or monitoring shows evidence of deterioration.
Predictive methods use data and analysis to estimate developing failure and support intervention before functional loss.
The best program may use all three depending on the equipment.
Run-to-failure can be a valid decision
Not every component requires preventive maintenance.
For a low-cost, non-critical item that is easy to replace and has no safety or quality consequence, planned run-to-failure may be appropriate.
The important point is that the decision should be intentional rather than the result of neglect.
Plan the work properly
Maintenance effectiveness depends on more than task frequency.
Technicians need the right parts, tools, information, permits, access and equipment condition before the job begins.
Good planning reduces waiting and improves the quality of the intervention.
Scheduling should also coordinate with operations so that maintenance can be completed without avoidable disruption.
Learn from failure history
Breakdowns provide information about the maintenance strategy.
Repeated failures may indicate weak task content, poor intervals, incorrect operation, design problems or a failure mode that the current strategy does not address.
Maintenance plans should evolve as evidence improves.
Common mistakes
One mistake is assuming more preventive maintenance always means greater reliability.
Excessive intervention can introduce defects, consume capacity and create unnecessary downtime.
Another mistake is measuring the program only by schedule compliance.
Compliance matters, but the stronger question is whether the maintenance strategy is reducing relevant equipment losses.
Planned Maintenance is effective when technical effort is concentrated where it changes equipment risk and supports stable production.