The old maintenance approach was traditionally based on replacing the equipment’s components at the right time, just before they fail. This viewpoint was derived from the belief that all the components would progressively wear down until they finally fail. Nowadays, the modern maintenance approach is based on the fact that only a small percentage of equipment actually follow this behaviour. However, since the classic belief is somewhat intuitive, there are still many maintenance departments who base their maintenance strategy on it.
Let’s have a look at the different ways a component can fail during its operating life.

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