A high percentage of preventive maintenance routines in many companies are non-value adding and often counter-productive.
They are also largely time-based routines rather than condition-based. The approach uses RCM logic in reverse starting with the tasks.
If so, it is further checked to see if the task frequency is appropriate. Tasks that do not meet RCM decision logic criteria are amended or deleted.
The characteristics of the plant and the quality of the preventive maintenance routines determine how the approach will be used. At one extreme it may be used as a 'quick fix' to get a more balanced PM regime before applying Fast-track RCM. By contrast, in a nuclear power environment it would be used as rigorously and with as full documentation as Classical RCM.
List the current tasks.
Identify the failure mode with its root cause that each task is aiming to prevent
Assess the failure pattern of each failure mode.
Assess whether the task meets RCM task selection criteria for both technical applicability and worth doing.
Accept, amend the task frequency, or delete the task.
Check for apparent omissions on safety systems, cleaning and lubrication, etc.