TM 5-4320-305-24PAO--(Assembled byExplanationorg/AVUM Level)AF--(Assembled byItems with these codes are not to be requested/requisitionedDS/AVIM Level)individually. The parts that make up the assembled itemAH--(Assembled bymust be requisitioned or fabricated and assembled at theGS Category)level of maintenance indicated by the source code.AL--(Assembled byIf the 3d position code of the SMR code authorizes youSRA)to replace the item, but the source code indicates theAD--(Assembled byitems are assembled at a higher level, order the itemDepot)from the higher level of maintenance.CodeExplanationXA--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 FSCM and part number given.XC--Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's partnumber.XD--Item is not stocked. Order an "XD"-coded item through normal supply channels using the FSCM and part numbergiven, if no NSN is available.NOTECannibalization or controlled exchange, when authorized, may be used as a source of supply foritems with the above source codes, except for those source coded "XA" or those aircraft supportitems restricted by requirements of AR 750-1.(2)Maintenance Code. Maintenance codes tells you the level(s) of maintenance authorized to USE andREPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMRcode as follows:(a) The maintenance code entered in the third position tells you the lowest maintenance level authorized toremove, replace, and use an item. The maintenance code entered in the third position will indicateauthorization to one of the following levels of maintenance.CodeApplication/ExplanationC--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.3
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