TM 10-3930-656-24P 3. Explanation of Columns (Sections II and III). a. ITEM NO.  (Column (1)).  Indicates the number used to identify items called out in the illustration. b. SMR CODE (Column (2)).  The  Source,  Maintenance,  and  Recoverability  (SMR)  code  is  a  5-position  code containing  supply/requisitioning  information,  maintenance  category  authorization  criteria,  and  disposition  instructions,  as shown in the following breakout: *Compete  Repair:    Maintenance  capacity,  capability,  and  authority  to  perform  all  corrective  maintenance  tasks  of  the "Repair" function in a use/user environment in order to restore serviceability to a failed item. (1) Source Code.  The source code tells you how to get an item needed for maintenance, repair, or overhaul of end item/equipment.  Explanations of source codes follow: Code Explanation Stocked  items;  use  the  applicable  NSN  to  request/requisition  items  with  these  source  codes.    They  are authorized to the category indicated by the code entered in the 3d position of the SMR code. **NOTE Items coded PC are subject to deterioration. Items  with  these  codes  are  not  requested/requisitioned  individually.    They  are  part  of  a  kit  which  is authorized to the maintenance. category indicated in the 3d position of the SMR code.  The complete kit must be requisitioned and applied. 2