TM 9-2815-250-24&P C-3. EXPLANATION OF COLUMNS (SECTIONS II AND III) (continued). Code O F H L D Z B Application/Explanation Unit maintenance or Aviation Unit is the lowest level that can do complete repair of the item. Direct Support or Aviation Intermediate is the lowest level than can do complete repair of the item. General Support is the lowest level that can do complete repair of the item. SRA is the lowest level that can do complete repair of the Item. Depot is the lowest level that can do complete repair of the item. Nonrepairable.  No repair is authorized. 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, and so on, 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 Z O F H D L A Application/Explanation Nonrepairable item.  When unserviceable, condemn and dispose of the item at the level of maintenance shown In the third position of the SMR code. Repairable  item.    When  uneconomically  repairable,  condemn  and  dispose  of  the item at Unit maintenance or Aviation Unit level. Repairable  item.    When  uneconomically  repairable,  condemn  and  dispose  of  the item at the Direct Support or Aviation Intermediate level. Repairable  item.    When  uneconomically  repairable,  condemn  and  dispose  of  the item at the General Support level. Repairable   Item.      When   beyond   lower-level   repair   capability,   return   to   Depot. Condemnation and disposal of the item is not authorized below Depot level. Repairable item.  Condemnation and disposal of the Item is not authorized below SRA. Item  requires  special  handling  or  condemnation  procedures  for  specific  reasons (e.g.,  precious  metal  content,  high  dollar  value,  critical  material,  or  hazardous material).  Refer to appropriate manuals/directives for specific instructions. c.   NSN [Column (3)].   The NSNs for the Items are listed in this column. C-4