TM 55-4920-431-23P
Code
Definition
XA
- Item is not procured or stocked because
the requirements for the item will result
in the replacement of the next higher
assembly.
XB
- Item is not procured or stocked. If not
available through salvage requisition.
XC
- Installation drawing, diagram, instruction
sheet, field service drawing, that is
identified by manufacturer's part number.
XD
- A support item that is not stocked. When
required item will be procured through
normal supply channels.
NOTE: Cannibalization or salvage may be used as a source of supply for any items coded above, except those
coded XA and aircraft support items as restricted by AR 700-42.
(2) Maintenance Code. Maintenance codes are assigned to indicate the levels of maintenance
authorized to USE and REPAIR support items. The maintenance codes are entered in the third or fourth positions of the
Uniform SMR Code format as follows:
(a) The maintenance code entered in the third position will indicate the lowest maintenance level
authorized to remove, replace, and use the support item. The maintenance code entered in the third position will indicate
one of the following levels of maintenance.
Code
Application/Explanation
O
- Support item is removed, replaced, used
at the unit level.
F
- Support item is removed, replaced, used
at the intermediate level.
D
- Support items that are removed, replaced,
used at depot, mobile depot, or special-
ized repair activity only.
(b) The maintenance code entered in the fourth position indicates whether the item is to be
repaired and identifies the lowest maintenance level with the capability to perform complete repair (i.e., all authorized
maintenance functions). This position will contain one of the following maintenance codes.
Code
Application/Explanation
O
- The lowest maintenance level capable of
complete repair of the support item is the
unit level.
F
- The lowest maintenance level capable of
complete repair of the support item is the
intermediate level.
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