TM  5-2815-240-34&P Maintenance   Code Application/Explanation O Unit is the lowest level that can do complete repair of the item. F Direct support 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. D Depot is the lowest level that can do complete repair of the item. L Reparable item.  Repair restricted to designated Specialized Repair Activity. Z Nonreparable.  No repair is authorized. B No repair is authorized.  No parts or special tools are authorized for maintenance of “B” coded item.  However, the item may be reconditioned by adjusting, lubricating, etc., at the user level. B-4        Change 3 (2) FOURTH POSITION.  The maintenance code entered in the fourth position tells you whether or not the item is to be repaired and identifies the lowest maintenance level with the capability to do complete repair (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. Maintenance     Code Application/Explanation C Crew or operator maintenance done within unit maintenance. O Unit level maintenance can remove, replace, and use the item. F Direct support maintenance can remove, replace, and use the item. H General support maintenance can remove, replace, and use the item. D Depot level can remove, replace, and use the item. B-3.  EXPLANATION OF COLUMNS IN THE REPAIR PARTS LIST AND SPECIAL TOOLS LIST WORK PACKAGE (Continued).