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-Definition of maintenance 

According to the AFNOR NF-X 60 000 standard, maintenance is "all activities aimed at maintaining or restoring an asset in a specified operating state to establish a required function.

Maintenance therefore brings together all technical, but also administrative and management actions, allowing a company to maintain the proper functioning of equipment and ensure production.

The objectives set by management make it possible to implement a maintenance strategy.

From this strategy then arise the types of maintenance to be deployed.

The NF-X 60 000 standard differentiates between two main families: corrective maintenance and preventive maintenance. 

-Corrective maintenance


AFNOR definition of corrective maintenance: "Maintenance performed after detection of a breakdown and intended to restore an asset to a state in which it can perform a required function".

Corrective maintenance corresponds to an operation undertaken following a breakdown, a disaster or a hazard. Its objective is to put machines back into operation by troubleshooting, repairing or replacing defective parts.

There are two types of corrective maintenance:

-Palliative maintenance

Palliative maintenance is troubleshooting. It consists of temporarily restoring a machine or tool to working order, while waiting for its repair. Palliative maintenance makes it possible to avoid a total production shutdown, in which case it is called resuming production in "degraded" mode.

Troubleshooting: physical actions performed to allow an asset to perform its required function for a limited period of time until the repair is carried out.

Example: When a garden hose is punctured, palliative maintenance consists of temporarily repairing the leak with adhesive tape.

-Maintenance  Corrective

Take the water out of the water. Contrary to what you offer works in the long run, remove the water from the water. Then you move to take natural production measures.

Repair the security forces that are made due to the function of the malfunctioning asset.

Example: The corrective maintenance procedure will occur is to change the punctured Christmas with a new hose.

Preventive maintenance

AFNOR definition of preventive maintenance: "Maintenance performed at predetermined intervals or according to prescribed criteria and intended to reduce the probability of failure or deterioration of the operation of an asset".


Preventive maintenance is therefore, as its name suggests, prevention through regular maintenance of a machine or asset. It consists of carrying out checks according to established standards and/or in accordance with the manufacturer's instructions, but also according to human experience and the history of interventions carried out on the asset.

-Preventive maintenance aims to:

- guarantee the availability of the asset.

- increase its lifespan,

- reduce the probability of breakdowns and therefore corrective maintenance actions,

- control energy or spare parts consumption by contributing to stock control.

- There are several types of preventive maintenance: 

-Maintenance systématique

Systematic preventive maintenance is carried out according to a schedule, based on time or the number of units of use, but without prior inspection of the asset.

The frequency of interventions is established from the start of operation of the asset or following a partial or complete overhaul of it.

Example: The oil change on a machine can be defined after a certain number of weeks of use without prior specific inspection.

-Conditional maintenance

Conditional preventive maintenance is based on monitoring the asset based on a predefined type of event (self-diagnosis, sensor information, etc.). It involves information collected in real time, using techniques such as tribology or infrared thermography, with the aim of intervening when the asset has crossed the previously set wear or degradation threshold. This involves carrying out the right operation at the right time, for better cost control.

Example: Regular analysis of a machine's oils makes it possible to detect pollution, equipment wear and the quality of the lubricant, and to change the lubricant when it no longer meets the criteria for proper operation.

-Preventive Maintenance

Predictive maintenance (sometimes called predictive), according to the definition of AFNOR, is "conditional maintenance carried out following stable expectations from the analysis and evaluation of important parameters of the deterioration of the asset".

It consists in anticipating maintenance needs by preventing breakdowns or malfunctions. This is maintenance 4.0, with continuous monitoring of changes in certain parameters, thresholds and various data (CMMS software, etc.), allowing precise management to initiate the correct intervention based on all the parameters.

The Maintenance Management Software (CMMS) is a good IT solution to help you effectively monitor interventions, retrieve reliable data and develop your maintenance plan! More predictions and fewer repairs!

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