TM 5-3815-228-12&PSECTION I(1) Source Code. The source code tells you how to get an item needed for maintenance, repair or overhaul of anend item/equipment. Explanations of source codes followsCodeApplication/ExplanationPAStocked items; use the applicable NSN toPBrequest/requisition items with thesePC**source codes. They are authorized to thePDcategory indicated by the code entered inPE3d position of the SMR code.PFPG**Items coded PC are subject to deteriorationKDItems with these codes are not to beKFrequested/requisitioned individually..KBis part of a kit, which is authorized to the maintenance category indicated in the 3d position of the SMR code.The complete kit with the above source codes, except for those source must be requisitioned and applied.MO-(Made at UMItems with these codes are notAVUM Level)to be requested/ requisitionedMF-(Made at DS/ individually. They must be made from bulk material which is identified by the part number in theAVUM Level)DESCRIPTION AND USABLEON CODE OC) column and listed in the Bulk Material group of the repairparts list in thisML-(Made atSpecialized RepairRPSTL. If the item is authorized-Act (SRA))to you by the 3d position code of the SMR code, but if theMD-(Made atsource code indicates it is madeDepot)at a higher level, order the item from the higher level of maintenance.AO-(Assembled byItems with these codes are notUM/AVUM Level)to be requested/requisitioned individually. The parts thatAF-(Assembled bymake up the assembled itemDS/A VIM Level) must be requisitioned or fabricated and assembled at the levelAH-(Assembled byof maintenance indicated byGS Category)the source code. If the 3d position code of the SMR code byAL-(Assembled byauthorizes you to replace theSRA)item, but the source code indi-AD-(Assembled cates the item is assembled at aby Depot)bled at a higher level, order the item from the higher level of maintenance.XA -Do not requisition an XA-coded Item. Order its next higher assembly. (Also, refer to the NOTEbelow)XB-If an "XB" item is not available from salvage order it using the CAGE and part number givenXC-Installation drawing, diagram, instruction sheet field service drawing, that is identified by themanufacturer's part number.XD-item is not stocked Order an "XD coded item through normal supply channels using the CAGE and partnumber given, if no NSN is available.NOTE: Cannibalization or controlled exchange, when authorized may be used as source of supply for items 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 REPAIRsupport 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 toremove, replace and use an item. The maintenance code entered in the third position will indicate authorization to one ofthe following levels of main-CodeApplication/ExplanationC-Crew or operator maintenance done within unit or aviation unit maintenance0-Unit maintenance or aviation unit category can remove, replace and use the itemF-Direct support or aviation intermediate level can remove, replace and use the itemH-General support level can remove, replace and use the itemL-Specialized repair activity can remove, replace and use the item.A-2
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