Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 39 studies the combination of various methods of designing for reliability, availability, maintainability and safety, as well as the latest techniques in probability and possibility modelling, mathematical algorithmic modelling, evolutionary algorithmic modelling, symbolic logic modelling, artificial intelligence modelling, and object-oriented computer modelling, in a logically structured approach to determining the integrity of engineering design. . | Theoretical Overview of Availability and Maintainability in Engineering Design 363 Defect maintenance is the corrective action in maintenance through fixing or repairing equipment after it has failed. Routine maintenance is the preventive action in maintenance that cares for the operational condition of equipment through inspection adjustment recording monitoring servicing and lubrication to ensure that the equipment s operational functions conform to the required limits of performance. These routine maintenance activities canbe grouped into the following categories that canbe scheduled on a fixed-time interval Running checks This includes inspections and minor adjustments. Monitoring checks This includes data log records and condition monitoring readings. Service checks This includes replacement of lubricants and consumable parts. The concept of routine maintenance is based upon the type of preventive actions that can be routinely carried out or by definition performed according to a regular course of procedure on a fixed-time interval basis. Evidently this type of preventive action can only be directed towards the operational condition of equipment. Preventive maintenance is the preventive action in maintenance that strives to reduce the likelihood of failure through the detection of identifiable potential failures in the equipment s physical condition and thus attempts to avoid functional failure occurrences. This is done through scheduled checks and inspections of physical condition fault diagnostics measurement scheduled shutdowns for opening and cleaning equipment scheduled shutdowns for replacing worn components and scheduled shutdowns for overhauling plant and equipment. These preventive maintenance activities can be grouped into the following categories that are scheduled on run-time intervals Physical checks This includes scheduled checks of physical conditions and fault diagnostics. Measurement checks This includes measurement of physical conditions
