Key takeaways
The 5 levels of maintenance are a complexity scale defined by the French standard AFNOR NF X 60-010. They rank tasks from Level 1 (simple operator actions like lubrication) through Level 5 (manufacturer-grade overhauls), based on who performs the work, the tooling required, and how much diagnosis and disassembly each task demands.
The 5 levels of maintenance are a framework that classifies maintenance tasks by their complexity, from the simplest operator checks to full manufacturer rebuilds. The model originates from the French standards body AFNOR in standard NF X 60-010, whose 1994 edition defines maintenance activities and levels within the broader NF X 60-000 maintenance function framework.
Each level is defined by three things: who performs the work (operator, technician, specialist, or OEM), the tooling and spare parts required, and how much diagnosis and disassembly the task involves. As you climb the levels, the required expertise, the cost, and the typical downtime all rise.
The point of the model is decision-making. By tagging a task with a level, you can answer a practical question: can my team handle this in-house, or does it need a specialist or the original manufacturer? According to AFNOR standard NF X 60-010 (1994), Concepts and definitions of maintenance activities, the classification of maintenance levels is part of the standardized definitions for the maintenance function.
Level 1 maintenance covers simple, routine interventions performed by the equipment operator on easily accessible components, with no dismantling and minimal tooling. These are the everyday actions built into normal production, not specialist jobs.
Typical Level 1 tasks include lubrication, cleaning, visual inspections, fluid and sight-glass checks, meter readings, and swapping consumables such as a light bulb. The person doing the work follows a basic checklist or visual guide and needs little or no formal maintenance training.
Level 1 is the foundation of autonomous maintenance under TPM, where operators take ownership of basic equipment care. Done consistently, these small actions catch problems early and prevent the minor faults that snowball into unplanned downtime.
Level 2 maintenance involves straightforward repairs and preventive actions carried out by a trained technician following documented procedures, using standard tools and common spare parts. The work is not very complex, but it requires more than operator-level knowledge.
Examples include replacing belts, fuses, hoses, and air filters, tightening loose fasteners, making simple adjustments, and swapping standard wear parts. The technician needs equipment-specific training and basic safety qualification, but the task does not require deep diagnosis.
Most scheduled preventive maintenance program tasks live at Level 2. They are predictable, procedure-driven, and ideal candidates for time-based or usage-based triggers in a maintenance system.
Level 3 maintenance covers complex interventions that require diagnosis before repair and often partial disassembly, performed by a specialized technician with the right instruments and machine documentation. This is where troubleshooting becomes a real skill rather than a checklist step.
Examples include diagnosing a vibration problem and replacing worn motor bearings, tracing a hydraulic leak, or swapping a PLC card or pump after identifying the root cause. The technician uses measuring instruments, schematics, and the equipment manual, and works either on the line or in a workshop.
Because Level 3 hinges on correctly identifying the cause, this is exactly where reliability data matters. Metrics like MTBF and MTTR and techniques such as vibration analysis help technicians confirm a diagnosis before they open the machine.
Levels 4 and 5 cover the most demanding work: major overhauls by specialist teams (Level 4) and manufacturer-grade rebuilds by the OEM (Level 5). Both involve significant expense, specialized facilities, and extended downtime, so they are planned events rather than routine tasks.
Level 4 is large-scale, high-importance work requiring specific qualification and dedicated workshop equipment, often supervised by a specialized manager. Examples include compressor valve overhauls, dynamic balancing of industrial fans, oil analysis programs, and infrared thermography. The work goes beyond standard repair and demands controlled conditions.
Level 5 is reserved for actions that use means similar to original manufacturing, typically carried out by the equipment manufacturer (OEM) or an approved rebuilder. Think of a complete turbine teardown and reconstruction, or a regulatory-compliance retrofit. These tasks usually trigger the build-versus-buy and repair-versus-replace conversation.
Deciding which assets justify Level 4 and Level 5 investment is a question of asset criticality : you reserve your heaviest interventions for the equipment whose failure hurts most.
The table below summarizes each level by who performs it, the tooling involved, the complexity, and a representative example.
| Level | Who performs it | Tooling and parts | Complexity | Example |
|---|---|---|---|---|
| Level 1 | Operator / production staff | Minimal; consumables and checklists | Simple, no diagnosis | Lubrication, cleaning, bulb swap |
| Level 2 | Trained technician | Standard tools; common spares (belts, filters, fuses) | Low; documented procedures | Replace a worn belt or filter |
| Level 3 | Specialized technician | Measuring instruments, schematics, manuals | High; diagnosis and partial disassembly | Replace motor bearings after vibration diagnosis |
| Level 4 | Specialist team / certified analyst | Workshop equipment, precision diagnostics | Very high; major overhaul | Compressor valve overhaul, fan balancing |
| Level 5 | Manufacturer (OEM) / approved rebuilder | Manufacturing-grade equipment | Highest; full reconstruction | Complete turbine teardown and rebuild |
This structure matches the complexity ladder described by maintenance-software references such as Mobility Work's overview of the AFNOR levels.
The levels matter because they turn a vague question, "should we fix this ourselves?", into a structured decision. By classifying each task, you match difficulty to the right resource and avoid two costly mistakes.
The first mistake is under-skilling: handing a Level 3 diagnostic job to someone equipped only for Level 1, which leads to misdiagnosis and repeat failures. The second is over-skilling: paying for an OEM visit on a task a trained in-house technician could close. The levels make your in-house-versus-outsource line explicit.
They also clarify training and staffing. If most of your backlog sits at Levels 3 and 4, you know where to invest in skills or vendor contracts. The framework gives operations and reliability leaders a shared language for capability planning.
A CMMS operationalizes the 5-level model by tagging every work order with its maintenance level and routing it to a correctly qualified technician, with the right parts and instructions attached. The framework stays theoretical without a system to enforce it.
In practice, a modern maintenance platform does four things with the levels:
This is where Fabrico's approach differs from tools that simply store maintenance history. Fabrico connects to machine PLCs to detect the fault, uses computer vision to capture the true cause of downtime, and turns that fault into a prioritized, parts-ready digital work order on the technician's phone with a QR-enforced checklist.
The level is not just recorded, it drives who gets dispatched and what they carry. As an EU-built platform headquartered in Bulgaria, Fabrico also keeps that maintenance data within European data-residency boundaries.
When you connect the 5-level model to live machine data and reliability metrics, level assignment stops being a manual judgment call and becomes automatic. Pairing the levels with OEE monitoring means the same system that spots a performance loss can dispatch the correctly leveled fix.
If you want to see how fault-to-fix routing works on your own equipment, book a Fabrico demo and walk through a live work order.
The 5 levels of maintenance are defined by the French standards body AFNOR in standard NF X 60-010, whose 1994 edition (Concepts and definitions of maintenance activities) classifies interventions by increasing complexity from Level 1 to Level 5. It sits within the broader NF X 60-000 industrial maintenance function framework.
Level 1 is performed by equipment operators, Level 2 by trained technicians following documented procedures, Level 3 by specialized technicians who diagnose before repairing, Level 4 by specialist teams or certified analysts in a workshop, and Level 5 by the original equipment manufacturer or an approved rebuilder using manufacturing-grade means.
Level 1 maintenance is simple operator work such as lubrication, cleaning, and visual checks that needs no dismantling and minimal tooling. Level 2 maintenance involves straightforward repairs by a trained technician using standard tools and common spare parts, such as replacing belts, filters, or fuses, following documented procedures.
A CMMS uses the 5 levels by tagging each work order with its maintenance level, then routing it to a technician whose qualification matches that level, with the correct spare parts and a step-by-step checklist attached. This ensures complex tasks are not handed to under-skilled staff and simple tasks do not waste specialist time.
The 5 levels are important because they convert the in-house-versus-outsource question into a structured decision. By classifying each task by complexity, you match difficulty to the right resource, avoid misdiagnosis from under-skilling and unnecessary cost from over-skilling, and plan training and vendor contracts around where your backlog actually sits.
No. Predictive maintenance is a maintenance strategy, not a level in the AFNOR scale. The 5 levels classify tasks by execution complexity and required expertise, while predictive maintenance describes a condition-based approach to deciding when to act. Predictive techniques such as vibration and oil analysis often appear within Level 3 and Level 4 work.
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