tasks such as modernization, modification, or repair equipment. SRA—Shop Replaceable Assembly—A generic term which includes all the packages within a WRA including chassis and wiring as a unit. (Sub-level mechanization or modular subdivisions within an SRA may occur.) Conversely, a WRA is composed entirely of SRAs. SRC—Scheduled Removal Component. SRS—Supply Response Section—The section of the aviation supply that receives requests for material and causes the issue and delivery of the requested material to be made. SSCC—Standard Subject Classification Code. SSIC—Standard Subject Identification Code. SSK—Seat Survival Kit. STATISTICAL ANALYSIS—The science of draw- ing conclusions from observed data by using statistical techniques and methods proven to be mathematically valid. STATISTICAL DATA—An accumulation of data which may be graphically presented or tabulated for use in determining the quality level being produced by any specific manufacturing, repair overhaul, or inspection process. STATISTICAL QUALITY CONTROL—The control of quality through the application of statistical techniques to inspection/verification methods and process analysis. STATUS CODES (MILSTRIP)—Codes that furnish information from supply sources to requisitioners or cosigners on the status of requisitions. Supply status (except “rejection” status, code C) predicts shipment on time as specified by the priority delivery date or the required delivery date. STRIKE—The official action that removes an aircraft from the list of Navy aircraft. SUBASSEMBLY—Two or more parts that form a portion of an assembly or a unit, replaceable as a whole, but having a part or parts that are individually replaceable. SUBJ—Subject (correspondence, message). SUBSYSTEMS—A combination of two or more pieces of equipment, generally physically separated when in operation, and such other components, assemblies, subassemblies and parts necessary to perform an operational function or functions. SUF—Suffix—The suffix is an alphanumeric code added to the basic JCN to identify a subassembly or sub-subassembly (component within a component) repair action performed independently of a major repair action. TAMS—Test and Monitoring System. TARGET DRONE—A converted man-carrying aircraft used as an airborne target, capable of either manned flight, being remotely controlled, or preprogrammed for unmanned flight. TAT—Turnaround Time—TAT is: The time period that commences with the time an aircraft is removed from an operating unit to undergo a rework process and terminates when the reworked aircraft is returned to an operating unit. A change of reporting and controlling custody is not necessarily involved; however, a change in physical custody is always involved. TAT is the sum of the following: time enroute from an operating unit to the naval facility, time awaiting rework, time in rework, time awaiting flight check after rework, time in a COMNAVAIRSYSCOM ready-for-issue status, and time enroute to an operating unit. The time needed to service, inspect, and check an item prior to recommitment. The interval between the time a repairable item is removed from use and the time it is available for reissue in a serviceable condition. TD—Technical Directive—A document authorized and issued by COMNAVAIRSYSCOM to provide technical information necessary to properly and systematically inspect or alter the configuration of aircraft, engines, systems, or equipment, subsequent to establishment of each respective baseline configuration. TDs include all types of changes and bulletins and consist of information that cannot be disseminated satisfactorily by revisions to technical manuals. NATEC controls assignment of TD numbers. TD CODE—Technical Directive Code—A two-char- acter numeric code that identifies the type of TD. TD IDENTIFICATION CODE—Technical Direc- tive Identification Code—A 12- or 13-character alphanumeric code used to identify a specific TD. AI-24