TM 5-4320-234-34PExplanationItems with these codes are not to be requested/requisitionedindividually. The parts that make up the assembled item must berequisitioned or fabricated and assembled at the level ofmaintenance indicated by the source code. If the 3d position codeof the SMR code authorizes you to replace the item, but the sourcecode indicates the items are assembled at a higher level, order theitem 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 and part 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 750-1.(2) Maintenance Code. Maintenance codes tells you the level(s) of maintenanceauthorized to USE and REPAIR support items. The maintenance codes areentered 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 maintenancelevel authorized to remove, replace, and use an item. The maintenance code enteredin the third position will indicate authorization to one of the following levels ofmaintenance.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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