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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
