TM 5-3805-257-24P C - Crew  or  operator  maintenance  done  within  unit maintenance or aviation unit maintenance. H General  support  is  the  lowest  level  that  can  do complete repair of the item. L Specialized repair activity Is the lowest level that can do complete repair of the Item. D Depot  is  the  lowest  level  that  can  do  complete repair of the item. Z - Nonreparable.  No repair is authorized. B - No  repair  is  authorized.    (No  parts  or  special tools  are  authorized  for  the  maintenance  of  a "B"-coded   item.)   However,   the   item   may   be reconditioned  by  adjusting,  lubricating,   etc.,   at the user level. (3) Recoverability Code.  Recoverability codes are  assigned  to  items  to  indicate  the  disposition  action on   unserviceable   items.      The   recoverability   code   is entered in the fifth position of the SMR code as follows: Code     Application/Explanation B - No  repair  is  authorized.    (No  parts  or  special tools  are  authorized  for  the  maintenance  of  a "B"-coded   item.)   However,   the   item   may   be reconditioned  by  adjusting,  lubricating,   etc.,   at the user level. Z - Nonreparable item. When unserviceable, condemn and dispose of the item at the level of maintenance   shown   in   the   3d   position   of   the SMR code. O Reparable item. When uneconomically reparable,  condemn  and  dispose  of  the  item  at unit maintenance or aviation unit level. F Reparable item. When uneconomically reparable,  condemn  and  dispose  of  the  item  at the direct support or aviation intermediate level. H Reparable item. When uneconomically reparable,  condemn  and  dispose  of  the  item  at the general support level. D Reparable item.  When beyond lower level repair capability,  return  to  depot.    Condemnation  and disposal   of   item   not   authorized   below   depot level. L Reparable item.  Condemnation and disposal of item   not   authorized   below   specialized   repair activity (SRA). A Item  requires  special  handling  or  condemnation procedures  because  of  specific   reasons   (e.g., precious metal content, high dollar value, critical material,    or    hazardous    material).        Refer    to appropriate manuals/directives for specific instructions. c. CAGEC   (Column   (3)).      The   Commercial   and Government    Entity    (CAGE)    Code    (C)    is    a    5-digit alphanumeric    code    which    is    used    to    identify    the manufacturer,  distributor,  or  Government  agency,  etc., that supplies the item. d. PART   NUMBER   (Column   (4)).      Indicates   the primary  number  used  by  the  manufacturer  (individual, company,   firm,   corporation,   or   Government   activity), which controls the design and characteristics of the item by   means   of   its   engineering   drawings,   specifications standards,   and   inspection   requirements   to   identify   an item or range of items. NOTE:  When you use an NSN to requisition an item, the item you receive may have a different part number from the part ordered. e. DESCRIPTION AND USABLE ON CODE (UOC) (Column    (5)).        This    column    includes    the    following information: (1) The Federal item name and, when required, a minimum description to identify the item. (2) Physical security classification. Not Applicable. (3) Items that are included in kits and sets are listed below the name of the kit or set on Figure KIT (4) Spare/repair     parts     that     make     up     an assembled   item   are   listed   immediately   following   the assembled item line entry. (5) Part     numbers     for     bulk     materials     are referenced  in  this  column  in  the  line  item  entry  for  the item to be manufactured/fabricated. (6) When  the  item  is  not  used  with  all  serial numbers of the same model, the effective serial numbers are  shown  on  the  last  line(s)  of  the  description  (before UOC). (7) The usable on code, when applicable (see paragraph 5, Special Information). (8) In the Special Tools List section, the basis of issue (BOI) appears as the last line(s) in the entry for each   special   tool,   special   TMDE,   and   other   special support    equipment.        When    density    of    equipments supported exceeds density spread indicated in the basis of issue, the total authorization is increased proportionately. (9) The statement "END OF FIGURE" appears just below the last item description in Column 5 for a given figure in both Section 1i and Section 111. f. QTY (Column (6)).  The QTY (quantity per figure column)  Indicates  the  quantity  of  the  item  used  in  the breakout    shown    on    the    illustration/figure,    which    is prepared  for  a  functional  group,  subfunctional  group,  or an assembly.  A "V" appearing in this column in lieu of a quantity  indicates  that  the  quantity  is  variable  and  the quantity may vary from application to application. 4.  Explanation of Columns (Section lIV). a. NATIONAL STOCK NUMBER (NSN) INDEX. (1) STOCK  NUMBER  column.    This  column lists   the   NSN   by   National   Item   Identification   Number (NIIN) 3