TM   55-4920-403-20&P (b)  The  maintenance    code    entered in   the   fourth   position   indicates   whether   the   item is   to   be   repaired   and   identifies   the   lowest   main- tenance   level   with   the   capability   to   perform complete   repair   (i.e.,   all   authorized   maintenance functions).   This   position   will   contain   the   follow- ing   maintenance   code: Code Application/Explanation Z —— N o n r e p a r a b l e .     NO   r e p a i r     i s authorized. (3)  Recoverability  Code.   Recoverability codes   are   assigned   to   support   items   to   indicate the   disposition   action   on   unserviceable   items. The   recoverability   code   is   entered   in   the   fifth position   of   the   Uniform   SMR   Code   format   as follows: Code Definition Z ——— Nonreparable    item.    When    un- serviceable,   condemn   and   dispose at   the   level   indicated   in   position   3. c.   National   Stock   Number.   Indicates    the National  stock  number  assigned  to  the  item  and which   will   be   used   for   requisitioning   purposes. d.   Part   Number.   Indicates    the    primary number   used   by   the   manufacturer   (individual, company,   firm   corporation,   or   Government   ac- tivity),   which   controls   the   design   and   character- istics   of   the   item   by   means   of   its   engineering drawings,   specifications   standards   and   in- spection   requirements,   to   identify   an   item   or range   of   items. N O TE When   a   stock   numbered   item   is   requi- sitioned,   the   item   received   may   have   a different   part   number   than   the   part being   replaced. e.   Federal   Supply   Code   for   Manufacturer (FSCM).   The   FSCM   is   a   5-digit   numeric   code listed   in   SB   708-42   which   is   used   to   identify   the manufacturer,   distributor,   or   Government   agen- cy, etc. g. Unit   of   Measure   (U/M).  Indicates   the standard   of   the   basic   quantity   of   the   listed   item as   used   in   performing   the   actual   maintenance function.   This   measure   is   expressed   by   a   two- character   alphabetical   abbreviation   (e.g.,   ea,   in., pr,   etc.).   When   the   unit   of   measure   differs   from the   unit   of   issue,   the   lowest   unit   of   issue   that will   satisfy   the   required   units   of   measure   will   be requisitioned. h.   Quantity   Incorporated   in   Unit.   Indicates the   quantity   of   the   item   used   in   the   breakout shown   on   the   illustration   figure,   which   is   pre- pared    for    a    functional    group,    subfunctional group,   or   an   assembly.   A   “V”   appearing   in   this column   in   lieu   of   a   quantity   indicates   that   no specific   quantity   is   applicable   (e.g.,   shims,   spac- ers, etc.). C-4. C-5. a. Special   Information.   Not   Applicable. How   to   Locate   Repair   Parts. When   National   Stock   Number   or   Part Number   is   Unknown: (1)  First.  Find   the   illustration   covering the   XXXX   to   which   the   item   belongs. (2)  Second.   Identify   the   item   on   the   il- lustration   and   note   the   illustration   figure   and item   number   of   the   item. (3)  Third.   Using   the   Repair   Parts   List- ing,   find   the   figure   and   item   number   noted   on the   illustration. b.   When   National   Stock   Number   or   Part Number  is  known. (1)   First.   Using   the   Index   of   National Stock   Numbers   and   Part   Numbers,   find   the   per- tinent   National   stock   number   or   part   number. This   index   is   in   ascending   NIIN   sequence   fol- lowed   by   a   list   of   part   numbers   in   alphameric sequence,   cross-referenced   to   the   illustration   fig- ure   number   and   item   number. (2)  Second.   After   finding   the   figure   and item   number,   locate   the   figure   and   item   number in   the   repair   parts   list. C-6.   Abbreviations.   Not   Applicable. f.   Description.   Indicates   the   Federal   item name   and,   if   required,   a   minimum   description   to identify   the   item. C-2