Work Unit Code (WUC) Manuals Work Unit Code manuals provide a listing of assigned alphanumeric codes for identification of systems or equipment. WUCs are used to report and record maintenance information for use in a database. Planned Maintenance System (PMS) Publications PMS publications provide a basis for planning, scheduling, and complying with scheduled maintenance requirements. These maintenance requirements are scheduled at intervals based on daily or weekly intervals, flight time, operating hours, or number of cycles or events. The following are PMS publications: Periodic maintenance information cards (PMICs) Daily/special/preservation/conditional/aircraft service period adjustment (ASPA) manuals Turnaround checklists In instances where conflicts exist between PMS publications and other directives, the PMS publication takes precedence. PERIODIC MAINTENANCE INFORMA- TION CARD (PMIC).—Periodic maintenance in- formation cards (PMICs) contain scheduled or forced removal items and their replacement intervals, record of applicable technical directives, maintenance requirements system index by system, and a conditional inspection listing. DAILY, SPECIAL, PRESERVATION, CON- DITIONAL, AND AIRCRAFT SERVICE PERIOD ADJUSTMENT (ASPA) MANUALS.—These manuals cover the minimum daily inspections requirements and servicing and the performance of special inspection and conditional inspections. TURNAROUND CHECKLISTS.—These pub- lications are prepared to support inspection of exterior and interior aircraft surfaces in an abbreviated walk-around order. Checklists cover those items that are necessary to determine obvious defects that may have occurred during each flight. Structural Repair Manuals Structural repair manuals contain specialized repair information required by maintenance personnel to determine the extent of structural damage and instructions for performing a permanent or onetime flight repair. Illustrated Parts Breakdown (IPB) Listings The IPB provides system, subsystem, and individual parts identification, applicability, and source, maintenance, and recoverability (SM&R) codes. Coverage is normally contained in separate manuals or in a special section of the maintenance manual. An IPB assists maintenance and supply personnel. They can use the IPB to identify, requisition, issue, and store parts that are required for maintenance support of aircraft, weapons systems, equipments, components, and support equipment. Weight and Balance Manuals These manuals provide a standard system for a continuous record of basic weight, balance, and loading data for certain aircraft. OPERATIONAL MANUALS Operational manuals contain a description of weapon systems along with instruction for their effective use. Operational manuals include Naval Air Training and Operating Procedures Standardization (NATOPS), weapons loading manuals, and tactical manuals. They contain descriptions of weapons systems and systems integration. Operational manuals also contain operating instructions, operational applications, safety procedures, and emergency procedures for weapons systems. NATOPS Manuals NATOPS manuals define methods and procedures for conducting operational tasks or exercises. NATOPS manuals are specifically prepared in support of aircrew personnel. NATOPS manuals provide standardized ground and flight operational procedures, training requirements, and other operational information of a technical nature. The data is tailored to particular models of aircraft in accordance with Chief of Naval Operations (CNO) directives and with the assistance of aircraft model managers. Airborne Weapons Loading Lists, Stores Loading Lists, and Stores Reliability Cards These manuals are specifically prepared for use by squadron ordnance personnel. Airborne weapons and 3-2