employment, and responsibility to account for and provide information about the aircraft or SE. CONUS—Continental United States (contiguous 48 states). CONVERSION IN LIEU OF PROCUREMENT— Any conversion, service life extension, update, expansion/change of mission capability, improve- ment of combat capability, or combination of the foregoing. It is performed on existing aircraft for the primary purpose of providing a reasonably acceptable, modernized aircraft, as an alternative to procuring new aircraft to meet or maintain force levels. CORRECTIVE ACTION—Action necessary to remove or control the cause of deficiencies in products, systems, or processes. A documented design, process, procedure, or materials change implemented and validated to correct the cause of failure or design deficiency. CORRECTIVE MAINTENANCE—The actions performed to restore an item to a specified condition. CPO—Civilian Personnel Officer. CPT—Copilot Time. CPU—Central Processing Unit (computer). CRIPL—Consolidated Remain-In-Place List-A list- ing of all authorized remain-in-place items, is published by NAVICP and approved by the TYCOMs and COMNAVAIRSYSCOM. CRITICAL ITEM—An essential item that is in short supply or expected to be in short supply for an extended period. CRITICAL SUPPLIES AND MATERIALS— Those supplies vital to the support of operations which, for various causes, are in short supply or are expected to be in short supply. CROSS SERVICING—That function performed by one military service in support of another military service for which reimbursement is required from the service receiving the support. CSE—Common Support Equipment-Comprised of only those general purpose items supplying or measuring broad parameters of physical properties that are known to be established in the using service’s inventory; for example, ground electrical, pneumatic, and hydraulic power units; towing, hoisting, and fueling devices; signal generation devices; and voltage, amperage, and phase measuring devices. The application of SE items to other end items, systems, or components does not in itself justify or classify the items as CSE. CSE is divided as AVIONICS SE (common and peculiar) and NONAVIONICS SE (common and peculiar). CTPL—Central Technical Publication Library. CUSTODY—Cognizance and limited responsibilities for aircraft equipage, equipment, material, and SE. Categories of custody are CONTROLLING CUS- TODY, PHYSICAL CUSTODY, and REPORT- ING CUSTODY. CUSTODY CODES—Custody codes are single position, alpha characters which provide supplemental accountability detail about an SE transaction and the effect of the transaction on supply and financial records. These codes identify a specific category of SE items placed in the primary custody of an IMA. These items are issued to other activities (usually an organizational maintenance activity) on a subcustody basis. CUSTOMER SERVICE—D-level services, includ- ing emergency check, test, minor repair, manufacture of parts, heat-treating, plating, and machine shop service to relieve NMCS, PMCS, and work stoppage conditions. CY—Calendar Year. D-LEVEL (DEPOT-LEVEL) MAINTENANCE— Maintenance done on material requiring major rework or a complete rebuild of parts, assemblies, subassemblies, and end items, including the manufacture, modification, testing, and reclamation of parts as required. D-level maintenance serves to support lower levels of maintenance by providing technical assistance and performing maintenance beyond the responsibility of O-level and I-level maintenance. D-level maintenance provides stocks of serviceable equipment by using more extensive facilities for repair than are available in lower level maintenance activities. DAAS—Defense Automatic Addressing System. DAILY INSPECTION—An inspection conducted to inspect for defects to a greater depth than the turnaround inspection. DAR—Daily Audit Report. DATA—The method of communicating concepts, plans, descriptions, requirements, and instructions AI-6