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