A PREVENTIVE MAINTENANCE is Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems. PREVENTIVE MAINTENANCE helps to prevent parts, material, and systems failure by ensuring that parts, materials and systems are in good working order.

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Other /More definition:
A PREVENTIVE MAINTENANCE is Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems. PREVENTIVE MAINTENANCE helps to prevent parts, material, and systems failure by ensuring that parts, materials and systems are in good working order.