PMIC—Periodic Maintenance Information Card—The PMIC is the PMS publication that contains the component/assembly removal/ replacement schedule, airframe structural life limits, and a maintenance requirements systems index. It also contains a conditional inspection listing and a phase change implementation card (included as required). PMS—Planned Maintenance System. POSIT—Position Sensitive Indicator—The two-digit PSI of a component that has been identified in the applicable WUC manual by a double asterisk (**). Position sensitive indicators are used to evaluate performance and/or logistics characteristics between identical components. PPC—Power Plant Change. PR—Aircrew Survival Equipmentman. PREOPERATIONAL INSPECTION—A static or functional inspection, performed by the activity having physical custody, to verify that a unit of SE is properly serviced and ready for use. These inspections are performed prior to each use as specified on the MRCs. PROCUREMENT —The process of obtaining per- sonnel, services, supplies, and equipment. PRODUCTION AIRCRAFT—New aircraft accepted from the contractor by the Navy. They include all Navy aircraft procured for operational or training purposes, that is, all aircraft except those procured solely for experimental purposes. Every Navy aircraft is either experimental or production. PRODUCTION CONTROL—The functional organization within the IMA responsible for workload control. PRODUCTION DIVISION—Any division in the IMA responsible for a specific production workload; for example, avionics, power plants. PRODUCTION EQUIVALENT—An  approved configuration change to the product baseline incorporated by the manufacturer during production. The configuration change must have been approved for retrofit on in-service equipment via a TD. PSSN —Propulsion System Serial Number—The same as engine serial number. Modular engines will be assigned a PSSN which identifies the complete engine as an assembly. PUC—Permanent Unit Code—The six-character number permanently assigned to each reporting custodian of aircraft. The master code list is maintained by the CNO. PUCs may be obtained by the cognizant ACC for assignment to newly formed units by correspondence, message, or DSN telephone call. QA—Quality Assurance—A planned and systematic pattern of all the actions necessary to provide adequate confidence that the item or product conforms to established technical requirements. QAR—Quality Assurance Representative. QEC—Quick Engine Change such as in the following: QECA - Assembly QECK - Kit QECS - Stand QDR—Quality Deficiency Report. RADIOGRAPHIC—A method that uses X rays or similar radiation for the purpose of penetrating or being scattered by substances to reveal flaws or defects in the part or structure being examined. RCM—Reliability Centered Maintenance—A dis- ciplined logic or methodology used to identify preventive maintenance tasks to realize the inherent reliability of equipment at least expenditure of resources. RECTYP—Record Type. RECURRING REPORT—A periodic or situation report. A periodic report is one that is to be prepared regularly at prescribed time intervals such as monthly or quarterly. A situation report is one that is to be prepared whenever an event or situation of a previously specified type occurs. REFERENCE NUMBER—A number used to identify an item of production or a range of items of production by the manufacturer controlling the design, characteristics, and production of the item by means of its engineering drawings, specifications, and inspection requirements. REF—Reference (correspondence, message). REFERENCE SYMBOL—An alphanumeric code used to identify piece parts as distinct from other items of the same part number in a single subassembly or circuit, such as four of the same diodes within a circuit; each has the same part number but a different reference symbol. AI-21