Encl. (1) to COMDTINST 4100.7
Engineering Logistics CONOP
Downtime is the time the system is not operationally ready. It consists of the maintenance time to
repair a failed item and any logistics delay time in getting replacement parts if the repair includes a
remove and replace action. In engineering terms, maintenance time for an item is given by its
mean time to repair (MTTR) MTTR consists of the cumulative time to discover the failure, isolate
the fault and accomplish the repair which could involve a simple maintenance action or a remove
and replace action. Mean logistics delay time (MLDT) is accounted for as the sum of any
maintenance delay time (MDT) and mean supply response time (MSRT).
Platform. An aircraft, cutter, boat or separately identified organizational entity provided with
resources for the performance of a prescribed mission.
Surge Logistics. A sudden, unplanned increase in logistics requirements.
A-2-2
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