TM 5-3810-306-24P3.Explanation of Columns (Sections II and III). - (Continued)XA -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 partnumber given, if no NSN is available.NOTE: Cannibalization or controlled exchange, when authorized, may be used as a source of supply for items with theabove source codes, except for those source coded "XA" or those aircraft support items restricted by requirements of AR700-42.(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 3rd and 4th positions of the SMR Code as follows:(a) The maintenance code entered in the 3rd position tells you the lowest maintenance level authorized toremove, replace, and use an item. The maintenance code entered in the 3rd position will indicate authorization to one ofthe following levels of maintenance.CodeApplication/ExplanationC-Crew or operator maintenance done within organization 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.H-General support level can remove, replace, and use the item.L-Specialized repair activity can remove, replace, and use the item.4
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