TM 5-3610-285-24P
Code
Explanation
XA - - Do not requisition an "XA"-coded item. Order its next higher assembly. (Also, refer to the NOTE below.)
XB - - If an "XB" item is not available from salvage, order it using the CAGE Code and part number given.
XC - -Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's part
number.
XD - - Item is not stocked. Order an "XD"-coded item through normal supply channels using the CAGE Code and part
number given, if no NSN is available.
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 source coded "XA" or those aircraft support items restricted
by requirements of AR 700-42.
(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). This position will contain one of the following maintenance codes.
NOTE
Some limited repair may be done on an item at a lower level of maintenance, if authorized by the
Maintenance Allocation Chart (MAC) and SMR codes.
Code
Application/Explanation
O - Unit VAVUM is the lowest level that can do complete repair of the item.
F - Direct support VAVIM is the lowest level that can do complete repair of the item.
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