that provides users with an accurate means to process, store, and retrieve information on Aviation Life Support System (ALSS) items, such as parachutes. SECNAV—Secretary of the Navy. SER—Serial Number—A number that identifies a specific end item or component. The number is usually assigned by the manufacturer and is used to differentiate between a particular end item or component and others of the same T/M/S, design, and so forth. ment Information System. SERMIS—Support Equipment Resources Manage- SERVICE LIFE—The time period during which the item can be maintained in service without replacement. Each program aircraft, from acceptance to strike, follows a life cycle consisting of alternate periods of operating and rework time as prescribed for each model by OPNAVINST 3110.11. Aircraft become eligible for strike upon completion of the life cycle specified for the model. SERVICE PERIOD—A prescribed segment of the service life of aircraft subject to the SDLM process, such as a stated number of calendar months or accumulated flight hours that an aircraft is in the physical custody of an operating activity for use prior to SDLM or retirement. The number and length of standard service periods, together with associated planning factors and policies, are set forth in OPNAVINST 3110.11. SERVICEABLE —The condition of an end item in which all requirements for repair, bench check, overhaul, or modification (as applicable) have been accomplished, making it capable of performing the function or requirements for which originally designed. The fact that signs of previous use are apparent does not necessarily mean it is unserviceable. When appearance is not a primary consideration, and the condition of the item meets all safety and performance requirements, it will be processed as serviceable. SERVICING—The replenishment of consumables needed to keep an item in operating condition, but not including any other preventive mainte- nance. SESS—Support Equipment Standardization System— A microcomputer-based asset control system for SE. SET—A unit or units and the necessary assemblies, subassemblies, and parts connected or associated together to perform an operational function. SLEP—Service Life Extension Program—As one element of Conversion in Lieu of Procurement, is the restoration/replacement of a primary aircraft structure which has reached its life limit. SM&R CODE—Source, Maintenance, and Recoverability Code—A collective code assigned to items during the provisioning, source coding, or the selection process to convey specific infor- mation to maintenance and supply personnel. The SM&R Code consists of three parts: a source code, a maintenance code, and a recoverability code. SMQ—Special Maintenance Qualification. SOFTWARE—A set of programs, documents, procedures, and routines associated with the operation of a computer system. SORTIE—An operational flight by one aircraft. SOURCE CODE—Code assigned to support items (spares, repair parts, components, parts, kits, special tools, test equipment, and SE) to indicate the manner of acquiring items for the maintenance, repair, or overhaul of end items. SPARES—Articles identical to, or interchangeable with, the end articles on contract that are procured over and above the quantity needed for initial installation for support of an aeronautical system. SPARES AND REPAIR PARTS—Spares are components of assemblies used for maintenance replacement purposes in major end items of equipment. Repair parts are those piece parts, such as individual parts or nonrepairable assemblies, required for the repair of spares or major end items. SPECIAL INSPECTION—A scheduled inspection with a prescribed interval other than daily, phase, major engine, or SDLM. The intervals are specified in the applicable PMS publication and are based on elapsed calendar time, flight hours, operating hours, or number of cycles or events; for example, 7, 14, 28 days; 50, 100, 200 hours; 10, 100 arrestments; or 5000 rounds fired. SPECIAL REWORK—The work done to aircraft, aircraft equipment, and aircraft SE to improve or change their capability to perform specific missions or functions by replacement, removal, addition, alteration, or repair of parts on equipment of the aircraft. Special aircraft rework includes AI-23