PRODUCT DRAWINGS accordance with the data will be essentially identical to the original item or component. PRODUCT DRAWINGS Engineering drawings that provide the necessary design engineering, manufacturing, and quality support information necessary to permit a competent manufacturer to pro- duce an interchangeable item that duplicates the physical and per- formance characteristics of the original design without additional design engineering or recourse to the original design activity. PRODUCTION AND DEPLOYMENT PHASE (1) The period from production approval until the last system is delivered and accepted. (2) The fourth phase in the materiel life cycle. During this phase, all hardware, software, and trained personnel required to deploy an operational system are acquired. PRODUCTION LOT (1) A group of items manufactured under essentially the same conditions and processes. (2) A production lot of parts refers to a group of parts of a single part type; defined by a single design and part number; produced in a single production run