Maintenance is a combination of actions carried out to retain an item/machine equipment/system/Plant ‘in order to restore it to an acceptable working condition. The purpose of maintenance is to increase the system availability. The term maintenance covers the following aspects-

(a) Inspection of the item/plant/equipment/machine/system.

(b) Repair of the defects if any.

(c) Minor modification in order to reduce maintenance efforts.

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The basic function of maintenance is to keep plant, machinery, equipment, system in a condition that will meet normal operating requirements.