Similarly, system design will determine how much corrective maintenance is required (determined by the inherent Reliability of the system) and how long it will take. In other words, the design of the system will determine how much preventive maintenance is required and how long it will take.
WHAT TIME IS MDT PLUS
In this case, it is most often expressed as Mean Preventive Maintenance Time (Mpt or Mpt) plus Mean Corrective Maintenance Time (Mct or Mct ) plus Mean Logistics Delay Time (MLDT).Įxamining these components of Mean Downtime, it should be noted that both Mpt and Mct are essentially characteristics of system design. If Reliability constitutes the "Uptime" part of the formula, Mean Downtime constitutes the "Downtime." While not a formal KPP or KSA, its importance in determining Operational Availability is paramount.Īs with most other high-level sustainment metrics, Mean Downtime is generally broken down into lower order metrics.
WHAT TIME IS MDT MANUAL
The JCIDS Manual further identifies "Reliability" as a mandatory Key System Attribute (KSA). In addition to the projected supply chain approach with its resultant logistics footprint, the impact of surge/deployment acceleration requirements should be determined for this and the Materiel Availability metric. It includes all time where the system is not at the disposal of the Force Provider to initiate missions. The Defense Acquisition Guidebook, Chapter 5.1.1.2 defines mean downtime as the average time an end item is unavailable to perform its assigned mission after it experiences unscheduled or scheduled maintenance actions. Operational Availability is defined as Uptime divided by Uptime plus Downtime. Operational Availability is one of the two components of the Availability Key Performance Parameter (KPP) defined in Appendix E, Enclosure B of the Joint Capabilities Integration and Development System (JCIDS) Manual.
The principal importance of Mean Downtime (MDT) as a life cycle sustainment metric lies in its relationship to the Operational Availability (AO) formula.
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