Planned - On a regular basis, Preventive - To maintain working order or extend life, Corrective - Repairs, Front-line - Repairs and decorating an occupied building, Proactive - Undertaken to avoid failures or identify defects that could lead to failure, Reliability-centred - Combining maintenance strategies to ensure a physical asset continues to function correctly, Scheduled - Which is preventive maintenance carried out in accordance with predetermined intervals, number of operations, hours run, and so on,

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