6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. one identification number. This is shown at both the top and the bottom of the page. Each AEL has the word  END printed in the center of the page  immediately  following  the  last  line  of  data for that AEL. his ensures that a complete AEL is available. Characteristics:  A  general  description,  charac- teristics, and/or other identifying information concerning the equipage/system named in item 1.  This  may  include  additional  information  as stated in the text. Reference number/description data: Contains significant  information,  manufacturer’s  part numbers, reference numbers, special comments and references to other AELs, and so forth. Item name: Arranged in alphabetical sequence, the name of each item; and when appropriate or applicable, additional    nomenclature, dimensions, and so forth, to describe the item named. Stock number: The FSN assigned to the items. When  an  FSN  is  not  assigned,  this  position shows a manufacturer’s part or catalog number or  other  identifying  number. Security  classification:  Reserved  for  future COSAL  use Source  code:  Shows  the  availability  of  the  items and the method of procuremcnt. These codes are defincd  in  the  introduction. Maintenance code: Reserved for future COSAL use. Recoverability code: Shows the recoverability characteristics of the item as follows: R–Repairable S–Salvageable C–Consumable Blank: Column reserved for future COSAL USC. Allowance  notes  codes:  Provides  neccessary  and important  information  about  individual  items on the AEL. The introduction lists and defines these  codes. Custody codes:    Reserved for future COSAL use. Unit of issue: Thc smallest quantity of a stock item that can be issued. 18. 19. 20. 21. 22. 23. 24. Quantity:  Normally  blank  See  the  text  for additional  information. On  board  allowance  table:  Consist  of  eight numbered columns in which quantities may be shown. In certain cases, the total shipboard allowance quantity is determined by the sum total  of  quantities  appearing  in  designated columns of several AELs. The COSAL index will show all applicable AEL numbers and the appropriate  columns  for  each.  The  abbreviation AR  (as  required)  may  appear  instead  of  a quantity. Information as to quantity allowed will then be contained elsewhere in the AEL. Ship type and hull number: The specific ship for which the AEL is published. Page: Consecutive page numbering from first page to last page of all AEL pages published in the COSAL. Idcntification number: Same as item 3. Date: Same as item 4. Page: Same as item 5. The  Characteristics  column  (No.  6)  may  also contain  information  to  help  you  determine  allowance quantity,  equipage  type,  and  substitutions  necessary because of differences in the installed equipment and the characteristics  of  the  ship. The Quantity column (No. 18) is normally blank, but when it is used, as in figure 5-5, it shows the quantity of the individual items included in the equipage item. his helps you replace items that have been used. STOCK NUMBER SEQUENCE LIST (SNSL).– Thc SNSL is composed of two parts: storeroom items (SNSL-SRI) and operating space items (SNSL-OSI). Supply  officers  use  the  SNSL-SRI  to  determine  what repair parts to stock in the storerooms. They use the SNSL-OSI to determine the items required or generally used to maintain engineering spaces and equipment. We said earlier that the controlled equipage allowance shown  on  the  SNSL-OSI  is  mandatory,  but  the consumable items are listed only as a guide. ALTERNATE  NUMBER  CROSS  REFER- ENCE TO STOCK NUMBER.–  The   cross-reference section   contains   all   of   the   reference   numbers (specification, plan, catalog, part, or type number) in the APLs.  It  cross-references  them  to  the  current  NSN,  if one  is  assigned. COSAL MAINTENANCE.–  We said earlier that the COSAL is one of the primary publications to use 5-12