When a maintenance program is developed, it includes tasks that satisfy the criteria for both applicability and effectiveness.
The applicability of a task is determined by the characteristics of the component or equipment to be maintained.
The effectiveness is stated in terms of the consequences that the task is designed to prevent. The basics types of tasks that are performed by maintenance personnel are each applicable under a unique set of conditions.
Tasks may be directed at preventing functional failures or preventing a failure event consisting of the sequential occurrence of two or more independent failures which may have consequences that would not be produced by any of the failures occurring separately.
Maintenance Program task types include:
(1) Inspections of an item to find and correct any potential failures;
(2) Rework/remanufacture/overhaul of an item at or before some specified time or age limit;