TM 10-1670-298-20&P(1)SourceCode. The source code tells you how to get an item needed for maintenance, repair, or overhaulof an end item/equipment Explanations of source codes follows:Source CodeExplanationPAStocked items, use the applicable NSN to request/requisition Items with thesePBsource codes. They are authorized to the category indicated by the codePC**entered in the 3rd position of the SMR codePDPE**NOTE Items coded PC are subject to deterioration.PFPGKDItems with these codes are not to be requested/requisitioned individually. TheyKFare part of a kit which is authorized to the maintenance category indicated in theKB3rd position of the SMR code. The complete lot must be requisitioned andapplied.MO-(Made at Unit/AVUMItems with these codes are not to be requested/requisitionedLevel)individually. They must be made from bulk material whichMF-(Made at DSIAVUMis identified by the part number in the DESCRIPTION andLevel)USABLE ON CODE (UOC) column and listed in the BulkMH-(Made at GS Level)Material group of the repair parts list in this RPSTL.. If theML-(Made at Specializeditem is authorized to you by the 3rd position code of the SMRRepair Activity (SRA))code, but the source code indicates it is made at a higherMD-(Made at Depot)level, order the item from the higher level of maintenance.AO-(Assembled by Unit/AVUMItems with these codes are not to be requested/Level)requisitioned individually. The parts that make upAF-(Assembled by DS/AVIMthe assembled item must be requisitioned orLevel)fabricated and assembled at the level ofAH-(Assembled by GSmaintenance indicated by the source code. If theCategory)3rd position code of the SMR code authorizes youAL-(Assembled by SRA)to replace the item, but the source code indicatesAD-(Assembled by Depot)the items are assembled at a higher level, order theitem from the higher level of maintenanceXA-Do not requisition "XA"-coded item. Order its next higher assembly. (Refer to the NOTE below)XB-If an "XB" item is not available from salvage, order it using the CAGEC and part number given.XC-Installation drawing, diagram, instruction sheet, field service drawing, that is identified manufacturer's partnumber.XD-Item is not stocked. Order an 'XD"-coded item through normal supply channels using the CAGEC and partnumber given, if no NSN is available.NOTECannibalization or controlled exchange, when authorized, may be used as a source of supply for items with the abovesource codes, except for those source coded “XA" or those aircraft support items restricted by requirements of AR 750-1.C-2}}}}
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