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8 Objectifs de la maintenabilité

The maintainability of a machine or asset can be broken down into two parts:
  • Intrinsic maintainability;
  • Extrinsic maintainability;

The asset’s intrinsic maintainability incorporates the design provisions that facilitate maintenance (size, weight, layout, modularity, etc.). These provisions are little influenced by location, machine use, maintenance personnel and their organization.

Extrinsic maintainability is made up of the other conditions that must be met to maintain the good in its specified state.
It includes all the tasks involved in approaching the machine before work is carried out, then reassembling it after work has been carried out, testing it and leaving the site. Work organization therefore plays an important part in extrinsic maintainability, but technical solutions (the machine’s immediate physical environment or otherwise) and their repercussions are also very important.
For example, failure to take into account the size of the tools needed to work in confined spaces (corridors, plenums, etc.) will then force maintenance workers to modify their methods or speed of execution during an intervention.

8 objectives for maintainability

Objectives of equipment maintainability :

1. Anticipate and foresee the occurrence of failure or degradation;

2. Facilitate the execution of adjustment and upgrading actions by replacing consumable elements (dismantlability, etc.);

3. Provide a simple and as unambiguous as possible means of signaling or warning of failure or operating drift (testability…);

4. Make it easier for monitoring systems and users to locate the faulty or malfunctioning component. In particular, to aid unambiguous diagnosis (testability, visibility…);

5. Ensure the safety of personnel and assets as soon as a fault is reported or a fault alert is triggered (lockout/tagout, ergonomics, etc.);

6. Provide a means of delaying the time when repair becomes essential once the faulty element has been located (redundancy, degraded mode, etc.);

7. Provide a means of carrying out preventive or corrective maintenance while the asset is in operation (dynamic architecture, etc.);

8. Enable the exchange or repair of the faulty component in the shortest possible downtime, at the minimum skill level of those involved, and with the lowest level of spare parts stock (accessibility, handling, training, arduousness, etc.);

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