structured and documented set of tasks that include the activities, procedures, resources and the time
scale required to carry out maintenance
Note 1 to entry: The maintenance plan should be thoroughly analysed and modelled to produce relevant
Note 2 to entry: The forecasted probabilistic results established at the design stage are no longer valid if the
maintenance plan which has been considered is not thoroughly applied in operation.
Note 3 to entry: The maintenance plan should cover policies for both preventive maintenance (e.g. testing) and
corrective maintenance (e.g. minimize downtime, restore lost redundancy).
Note 4 to entry: The maintenance plan is part of an overall Operations and Maintenance plan. It is sometimes
called “maintenance policy”.
[SOURCE: EN 13306]
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards