TB 9-6115-643-13
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EXPLANATION OF COLUMNS (Section II) Con't
XC
Installation drawing, diagram, instruction sheet, field service drawing that is identified
by manufacture's part number
PA
Stocked items; use the applicable NSN to request/requisition items with these codes.
They are authorized to the category indicated by the code in the 3rd position of the
SMR code.
MO - (Made at
Items with these codes are not to be requested/requisitioned individually. They must be
Unit Level)
made from bulk material, which is identified by the NSN or part number in the Bulk
Material group of the repair parts list in this manual. If the item is authorized to you by
MF - (Made at DS
the 3rd position code of the SMR code, but the source code indicates it is made at a
Level)
higher level, order the item from the higher level of maintenance.
AO - (Assembled
Items with these codes are not to be requested/requisitioned individually. The parts that
at Unit Level)
make up the assembled item must be requisitioned or fabricated and assembled at the
AF - Assembled
level of maintenance indicated by the source code. If the 3rd position code of the SMR
at Direct Support)
code authorizes you to replace the item, but the source code indicates the item is
assembled at a higher level, order the item from the higher level of maintenance.
NOTE
Cannibalization when authorized may be used as a source of supply for items with
the above source codes.
(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:
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
-Unit maintenance can remove, replace, and use the item.
F
-Direct support or aviation intermediate level can remove, replace, and use the item.
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 (i.e., perform all authorized
repair functions).
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