TM 5-5430-219-23P (a) The maintenance code entered in the third position tells you the lowest maintenance level authorized to remove, replace, and use the item The maintenance code entered in the third position will indicate authorization to the following levels of maintenance. Maintenance Application/Explanation Code C - Crew or operator maintenance done within unit/AVUM maintenance. O - Unit level/AVUM maintenance can remove, replace, and use the item. F - Direct support/AVIM maintenance can remove, replace, and use the item. H - General support maintenance can remove, replace, and use the item. L - Specialized repair activity can remove, replace, and use the item. D - Depot can remove, replace, and use the item (b) The  maintenance  code  entered  in  the  fourth  position  tells  whether  or  not  the  item  is  to  be  repaired and  identifies  the  lowest  maintenance  level  with  the  capability  to  do  complete  repair  (i.e,  perform  all  authorized  repair functions.) NOTE Some  limited  repair  may  be  done  on  the  item  at  a  lower  level  of  maintenance,  if authorized by the Maintenance Allocation Chart and SMR code. Maintenance Application/Explanation Code O - Unit/AVUM is the lowest level that can do complete repair of the item. F - Direct support/AVIM is the lowest level that can do complete repair of the item. 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 shown in the fifth position of the SMR Code as follows: Recoverability Application/Explanation Codes Z - Nonreparable item.  When unserviceable, condemn and dispose of the item at the level of maintenance shown in 3rd position of SMR Code. O - Reparable  item.    When  uneconomically  reparable,  condemn  and  dispose  of  the  item  at  unit  or  AVUM level. F - Reparable item When uneconomically reparable, condemn and dispose of the item at the direct support or AVIM 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 the item not authorized below depot level. 3