TM 9-6150-228-13&P
(2) Maintenance Code. Maintenance codes tell you the level(s) of maintenance authorized to USE and
REPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMR code as
follows:.
(a) The maintenance code entered in the third position tells you the lowest maintenance level authorized to remove,
replace, and use an item. The maintenance code entered in the third position will indicated authorization to one of the
following levels of maintenance
CODE
Application/Explanation
C
-Crew or operator maintenance done within unit or aviation unit maintenance.
O
-Unit or aviation unit category can remove, replace, and use the item.
F
-Direct support or aviation intermediate level can remove, replace, and use the item.
H-General support level can remove, replace, and use the item.
L
-Specialized repair activity can remove, replace, and use the item.
D
-Depot level 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 (MAC) and SMR codes.) This position will contain one of the maintenance codes
CODE
Application/Explanation
O
-Unit or aviation unit is the lowest level that can do complete repair of the item.
F
-Direct support or aviation intermediate 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 (designate the 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
-Nonrepairable. 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.
F-3
