TM5-4120-339-24P KB Item included in both a depot overhaul/repair kit and a maintenance kit. MO Item    to    be    manufactured    or    fabricated    at organizational level. MF Item  to  be  manufactured  or  fabricated  at  the direct support maintenance level. MB Item  to  be  manufactured  or  fabricated  at  the general support maintenance level. MD Item  to  be  manufactured  or  fabricated  at  the depot maintenance level. AO Item to be assembled at organizational level. AF Item     to     be     assembled     at     direct     support maintenance level. AH Item    to    be    assembled    at    general    support maintenance level. AD Item   to   be   assembled   at   depot   maintenance level. XA Item  is  not  procured  or  stocked  because  the requirements   for   the   item   will   result   in   the replacement of the next higher assembly. XB Item is not procured or stocked.  If not available through salvage, requisition. XD A   support   item   that   is   not   stocked.      When required,  item  will  be  procured  through  normal supply channels. NOTE Cannibalization or salvage may be used as a source of supply for any Items source coded above except those coded XA or XD. (2) Maintenance   Code.      Maintenance codes     are     assigned     to     Indicate     the     levels     of maintenance authorized to use and repair support items. The  maintenance  codes  are  entered  in  the  third  and fourth  positions  of  the  Uniform  SMR  Code  format  as follows: (a) The maintenance code entered in the third position   will   indicate   the   lowest   maintenance   level authorized to remove, replace and use the support item. The maintenance code entered in the third position will indicate one of the following levels of maintenance. Code Application/Explanation C Crew or operator maintenance performed within organizational maintenance. O Support item is removed, replaced, used at the organizational level. I Support item is removed, replaced, used by the direct    support    element    of    integrated    direct support   element   of   integrated   direct   support maintenance. F Support item is removed, replaced, used at the direct support level. H Support item is removed, replaced, used at the general support level. D Support items that are removed, replaced, used at    depot,    mobile    depot,    specialized    repair activity only. NOTE Codes   "I"   and   "F'   will   be   considered   the same by direct support units. (b) The    maintenance    code    entered    in    the fourth   position   indicates   whether   the   item   is   to   be repaired  and  identifies  the  .lowest  maintenance  level with the capability to perform complete repair  (i.e.,  all authorized    maintenance  functions).    This  position  will contain one of the following maintenance codes. Code Application/Explanation O The    lowest    maintenance    level    capable    of complete   repair   of   the   support   item   is   the organizational level. F The    lowest    maintenance    level    capable    of complete repair of the support Item is the direct support level. 2