TM 5-3656-221-23PExplanationitems with these codes are not to be requested/requisitioned individually.The parts that make up the assembled item must be requisitioned orfabricated and assembled at the level of maintenance indicated by thesource code. If the 3d position code of the SMR code authorizes you toreplace the item, but the source code indicates the items are assembled at ahigher level, order the item from the higher level of maintenance.CodeExplanationXA - - Do not requisition "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'spart number.XD - - Item is not stocked. Order an "XD" -coded item through normal supply channels using the FSCM andpart number given, if no NSN is available.NOTECannibalization or controlled exchange, when authorized, may be used as a sourceof supply for items with the above source codes, except for those source coded"XA" or those aircraft support items restricted by requirements of AR 7501.(2) Maintenance Code.Maintenance codes tells you the level(s) of maintenance authorized to USEand REPAIR 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 levelauthorized to remove, replace, and use an item. The maintenance code entered in the thirdposition will indicate authorization 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.3
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