TM 10-1670-251-12&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 one of the
following levels of maintenance.
Code
Application/Explanation
C -
Crew or operator maintenance done within
organizational or aviation unit maintenance.
O -
Organizational 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.
C-8