Preventive maintenance

Preventive maintenance (PM) has the following meanings:


 * 1) The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or before they develop into major defects.
 * 2) Maintenance, including tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring.