TM   55-4920-414-13&P Code Application/Explanation D --- The lowest maintenance level capable of Z --- complete repair of the support item is the depot  level,  performed  by  depot,  mobile depot  or  specialized  repair  activity. Nonreparable. No repair is 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 Z --- Definition Nonreparable  item.  When  unserviceable, condemn and dispose at the level indicated in position 3. D --- Reparable item. When beyond lower level repair capability, send to depot. --- Condemnation and disposal not authorized below depot level, c.  National  Stock  Number.  Indicates  the  National Stock Number assigned to the item and will be used for  requisitioning  purposes.  Note  NSNs  have  not  as yet been assigned to all those items that require them, i.e.,  all  “P“  source  coded  items.  Until  such  time  as NSNs are assigned, these parts may be requisitioned by part number and Federal Supply Code for Manu- facturers,  or  Management  Control  Number  (MCN). d. Part Number. Indicates the primary number used by the manufacturer (individual, company, firm, cor- poration, 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 a stock numbered item is requisi- tioned,  the  repair  part  received  may  have a  different  part  number  than  the  part being  related. e.  Federal  Support  Code  for  Manufacturer  (FSCM). The FSCM is a 5-digit numeric code listed in SB 708- 42 which is used to identify the manufacturer, distrib- utor, or Government agency, etc. C-2 f. Description.  Indicates the Federal item name and any  additional  decription  required  to  identify  the  item. Basis of Issue (BOI) for Special Tools, Ground Sup- port,  and  Flyaway  Equipment. g. Unit of Measure (U/M). Indicates the standard of the  basic  quantity  of  the  listed  item  as  used  in  per- forming  the  actual  maintenance  function.  This  measure is expressed by a two-character alphabetical abbrevia- tion  (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 quan- tity of the item required for one assembly only, includ- ing instances when similar assemblies are broken down together. A “V‘’ appearing in this column in lieu of a quantity  indicates  that  no  specific  quantity  is  applicable, (e.g., shims, spacers, etc.). C-4.  How  to  Locate  Repair  Parts. a.  When  National  Stock  Number,  or  Management Control  Number,  or  Part  Number  is  Unknown: (1)  First.  Find  the  illustration  covering  the  as- sembly group to which the repair part belongs. (2) Second. Identify the repair part on the illus- tration and note the illustration figure and item num- ber of the repair part. (3) Third. Using the Repair Parts Listing, find the figure and item number noted on the illustration. b.  When  National  Stock  Number  or  Management Control Number, or Part Number is Known: (1)   First.   Using   the   Index   of   National   Stock Numbers or Management Control Numbers and Part Numbers, find the pertinent National Stock Number, Management  Control  Number  or  part  number.  This index  is  in  descending  National  Item  Identification Number  (NIIN)  sequence  followed  by  a  list  of  part numbers  in  descending  alphanumeric  sequence,  cross- -referenced to the illustration’s figure 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-5.   Abbreviations.  (Not  Applicable)