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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.