TM 5-2420-231-24P
0001
EXPLANATION OF COLUMNS IN THE REPAIR PARTS LIST AND SPECIAL TOOLS LIST WORK PACKAGES
CONTINUED
NOTE
Cannibalization or controlled exchange, when authorized, may be used as a source of
supply for items with the above source codes except for those items source coded "XA" or
those aircraft support items restricted by requirements of AR 750-1.
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:
1. Third Position. 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:
Maintenance
Code
Application/Explanation
O* . . . . . . . . . . . . . . Unit level/AVUM maintenance can remove, replace, and use the item.
F . . . . . . . . . . . . . . . Field Maintenance can remove, replace, and use the item.
H . . . . . . . . . . . . . . . Below Depot Sustainment Maintenance can remove, replace, and use
the item.
L . . . . . . . . . . . . . . . Specialized Repair Activity (SRA) can remove, replace, and use the item.
G . . . . . . . . . . . . . . . Afloat and Ashore Intermediate Maintenance can remove, replace, and
use the item (Navy Only).
K . . . . . . . . . . . . . . . Contractor facility can remove, replace, and use the item.
Z . . . . . . . . . . . . . . . Item is not authorized to be removed, replaced, or used at any mainte-
nance level.
D . . . . . . . . . . . . . . . Depot can remove, replace, and use the item.
NOTE: Army may use C in the third position. However, for joint service publications, Army
will use O.
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
O . . . . . . . . . . . . . . . Unit/AVUM is the lowest level that can do complete repair of the item.
F . . . . . . . . . . . . . . . Field is the lowest level that can do complete repair of the item.
H . . . . . . . . . . . . . . . Below Depot Sustainment is the lowest level that can do complete repair
of the item.
L . . . . . . . . . . . . . . . Specialized Repair Activity (SRA) (enter specialized repair activity or
TASMG designator) is the lowest level that can do complete repair of the
item.
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