All actions necessary for retaining an asset as near as practicable to its original condition, but excluding rehabilitation or renewal. Fixed interval maintenance is used to express the maximum interval between maintenance tasks. On-condition maintenance is where the maintenance action depends upon the item reaching some predetermined condition.

IIMM

Maintenance is any activity performed on an asset with a view to ensuring that it is able to deliver an expected level of service until it is scheduled to be renewed, replaced or disposed of.

LGAM

The combination of all technical and associated administrative actions intended to retain an item in, or restore it to, a state in which it can perform its required function.

DERM

A defect of an asset which adversely affects its ability to safely provide a service.

Maintenance required within a short time period to return the asset to the standard in which it can properly and reliably function. In order to return the item to its original condition and significance.

Corrective maintenance, excluding emergency corrective and programmed corrective maintenance.

IIMM

Corrective work required in the short-term to restore an asset to working condition so it can continue to deliver the required service or to maintain its level of security and integrity.

IIMM

Breakdown Maintenance is maintenance that is performed on an asset after it has failed. "Unplanned Maintenance" is maintenance carried out to no predetermined plan.

LGAM