issued  by  or  under  the  direction  of  NAVAIR. NAVAIR  publications  that  are  important  to  the supply  technical  library  are  briefly  described  in the  following  paragraphs. Naval Aeronautical Publications Index The  Naval  Aeronautical  Publications  Index (NAPI)  is  issued  in  the  following  parts: 1. Equipment Applicability List, NA 00-500A 2.   Avionics   Change   Cross-Reference,   NA 00-500AV 3.  Aircraft  Application  List,  NA  00-500B 4.  Directives  Application  List,  NA  00-500C 5.  Microfilm  Cartridge  Cross-Reference,  NA 00-500M 6.   Publications   Distribution   Index,   NA 00-500P 7.  Support  Equipment  Cross-Reference,  NA 00-500SE 8.   Airborne   Weapons/Stores,   Conventional/ Nuclear,  Check  Lists/Stores  Reliability Cards/Manual,  NA  01-700 9.  Navy  Stock  List  of  Publications  and Forms,   NAVSUP   P-2002 Allowance   requirements   registers   (ARRs), allowance   lists   (ALs),   and   tables   of   basic allowances (TBAs) are approved by NAVAIR and published  by  ASO.  Refer  to  table  1-1  for  a  list of  common  ARRs,  ALs,  and  TBAs. Allowance Requirements Registers The allowance requirements registers (ARRs) list   material   and   equipment   for   the   purpose indicated  in  the  register.  Material  listed  in  the ARR is normally retained in supply department stocks until required for use. The various ARRs are  used  as  guides  in  establishing  an  Aviation Consolidated Allowance List (AVCAL) for ships, air  stations,  and  MAGs.  The  AVCAL  is  a  list  of all items authorized to be carried in stock by these activities  for  support  of  aircraft  and  missiles. Allowance  Lists The  allowance  lists  (ALs)  contain  material  and equipment  for  the  purposes  indicated  in  each  list. The  ALs  are  used  as  guides  in  establishing  the Individual  Material  Readiness  Lists  (IMRLs).  The contents  of  ALs  include  the  equipment  and material  (both  consumable  and  repairable) necessary  to  outfit  and  maintain  units  of  the aeronautical organization. The ALs also identify items  used  with  sufficient  frequency  to  justify their  issuance  to  all  activities  maintaining  aircraft or  equipment  for  which  the  lists  are  designed,  and information   concerning   NSN,   nomenclature, interchangeability,  and  superseded  NSNs.  The ALs provide detailed instructions for the applica- tion and use of each publication, as well as a table of logistic data showing the total weight and cube of  all  material  contained  in  the  list. Tables  of  Basic  Allowances The  tables  of  basic  allowances  (TBAs)  are listings  of  equipment  and  material  required  for performance  of  specific  missions,  They  contain both  shop  equipment  and  common  supporting spare  parts  and  include  allowances  of  tools  and material required for the use of such activities as fleet  marine  force  (FMF)  squadrons,  guided missile  activities,  and  drone-type  activities, TECHNICAL    MANUALS Technical manuals normally contain a listing of parts and drawings of the parts for identifica- tion  purposes.  The  parts  lists  normally  identify the  manufacturer,  manufacturer’s  part  number, and  NSN  (if  one  is  assigned). Illustrated Parts Breakdown An  illustrated  parts  breakdown  (IPB),  also known as an illustrated maintenance parts list or illustrated  parts  catalog,  is  prepared  by  the manufacturer   for   each   model   aircraft,   engine accessory,  electronic  equipment,  or  support  equip- ment (SE). It is printed and issued by the authority of NAVAIR. The IPB is designed to allow supply and   maintenance   personnel   to   identify   and requisition  replacement  parts  for  aircraft  or  equip- ment.  All  procurable  assemblies  with  detailed parts are illustrated and listed in such a manner as   to   make   possible   quick   identification   of assemblies and their component parts. The items are  arranged  continuously  in  assembly  breakdown order  with  the  illustrations  placed  as  near  as possible  to  their  appropriate  listing. Technical  Directives Supply  personnel  will  often  be  required  to prepare  or  process  requisitions  for  component parts  required  for  incorporation  of  technical directives  (TDs).  Therefore,  it  is  necessary  to 1-18