Mean Downtime (MDT) is the average Total Downtime required to restore an asset to its full operational capabilities. MDT includes the time from reporting of an asset being down to the asset being given back to operations / production to operate. MDT includes administrative time of reporting, logistics and materials procurement and lock-out/tag-out of equipment, etc., for repair or preventive maintenance.

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U.S. Navy Petty Officer 3rd Class Josue Ortiz, center, uses hand signals to guide supplies aboard the guided-missile cruiser USS Cape St. George from the Military Sealift Command dry cargo and ammunition ship USNS Charles Drew during a replenishment in the Arabian Sea, May 24, 2012. Ortiz is a boatswain’s mate. U.S. Navy photo by Petty Officer 3rd Class Christopher S. Johnson


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