Schedule Maintenace / Planned Maintenance

Planned Preventative Maintenance ('PPM') or more usual just simple Planned Maintenance (PM) or Scheduled Maintenance is any variety of scheduled maintenance to an object or item of equipment. Specifically, Planned Maintenance is a scheduled service visit carried out by a competent and suitable agent, to ensure that an item of equipment is operating correctly and to therefore avoid any unscheduled breakdown and downtime.

Together with Condition Based Maintenance, Planned maintenance comprises preventive maintenance, in which the maintenance event is preplanned, and all future maintenance is preprogrammed. Planned maintenance is created for every item separately according manufacturers recommendation or legislation. Plan can be based on equipment running hours, date based, or for vehicles distance travelled. Good example of PM program is car maintenance. After so many kilometers or miles oil should be changed, parts renewed,...

Planned maintenance has some advantages over Condition Based Maintenance such as:

* easier planning of maintenance and ordering spares,
* costs are distributed more evenly,
* no initial costs for instruments for supervision of equipment.

Disadvantages are:

* less reliable than equipment with CBM
* more expensive due to more frequent parts change.

Parts that have scheduled maintenance at fixed intervals, usually due to wearout or a fixed shelf life, are sometimes known as time-change interval, or TCI items.

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