Preventative Maintenance [PM]

Mechanical repair
Field repair of aircraft engine (1915–1916)

The technical meaning of maintenance involves functional checks, servicing,[disambiguation needed] repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, governmental, and residential installations. Over time, this has come to include multiple wordings that describe various cost-effective practices to keep equipment operational; these activities take place either before or after a failure.

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