TM 5-4310-372-24P
(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 indicate
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 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 code.) This position
will contain one of the following 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
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.
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