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TM 10-4320-347-13&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
indicate authorization to the following levels of maintenance.
Code
Application/Explanation
C - Crew or operator maintenance done within unit/AVUM maintenance.
O - Unit level VAVUM maintenance can remove, replace, and use the item.
F - Direct support/AVIM maintenance can remove, replace, and use the item.
H - General support maintenance can remove, replace, and use the item.
L - Specialized repair activity can remove, replace, and use the item.
D - Depot 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 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.
C-4
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