This standard describes the Reliability-Centered Maintenance (RCM) (see 3.16.9) methodology used for the determination of maintenance requirements. It applies to all levels of system or equipment grouping, and to all scheduled maintenance, whether equipment is in use, ready for use, or in standby or lay-up condition. RCM addresses the total scheduled maintenance program for an enterprise; that is, organizational, intermediate, and depot level maintenance, regardless of the maintenance echelon possessing the capability to perform the maintenance. RCM methodology provides the foundation for a Condition Based Maintenance (CBM) program. The relationship between RCM and CBM+ technologies is included in Appendix F. This standard provides the procedure to develop corrective, inactive, and preventive equipment maintenance within a planned maintenance management system. Specific maintenance procedures may be developed, after the application of the RCM procedure outlined in this standard, for inclusion in class maintenance plans, and depot, intermediate, and organizational maintenance systems. Maintenance (corrective, inactive, and preventive) (see 3.15.3, 3.16.5, and 3.16.8, respectively) is the action of performing tasks (condition-directed, failure-finding, lubrication, servicing, and time-directed) (see 3.28.2, 3.28.4, 3.28.5, 3.28.6, and 3.28.7, respectively) at periodicities (periodic, situational, and unscheduled) to ensure the item’s functions (active, evident, hidden, and passive) (see 3.13.1, 3.13.2, 3.13.3, and 3.13.4) are available when required. For the purpose of this standard, the term “ship” refers to submarines, surface ships, aircraft carriers, and craft.