ARMY TM 9-2815-255-24P AIR FORCE TO 38G1-95-4 MARINE CORPS TM 2815-24P/2 3. Explanation  of  Columns  (Sections  II  and  III).  -  (Continued) Code Application/Explanation D -Depot  level  can  remove,  replace,  and  use  the item. (b)    The    maintenance    code    entered    in    the    4th 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  (MAC)  and  SMR  Codes.) This  position  will  contain  one  of  the following   maintenance   codes. Code Application/Explanation O -Organizational   or   (aviation   unit)   is   the lowest  level  that  can  do  complete  repair  of the  item. F H L D Z B -Direct  support  or  aviation  intermediate  is  the lowest  level  that  can  do  complete  repair  of the  item. -General  support  is  the  lowest  level  that  can do  complete  repair  of  the  item. -Specialized   repair   activity   (designate   the specialized   repair   activity)   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,  etc., at  the  user  level. 5