TM 10-4320-318-24PCodeExplanationXA--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 CAGE 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 CAGE and partnumber given, if no NSN is available.NOTECannibalization or controlled exchange, when authorized, may be used as asource of supply for items with the above source codes, except for thosesource coded "XA" or those aircraft support Items restricted by requirements ofAR 700-42.(2)MaintenanceCode. Maintenance codes tells you the level(s) of maintenance authorized to USE andREPAIR support Items. The maintenance codes are entered in the third and fourth positions of the SMR Codeas 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 third position willindicate authorization to one of the following levels of maintenance.CodeApplication/ExplanationC--Crew or operator maintenance done within unit or aviation unit maintenanceO--Unit or aviation unit category can remove, replace, and use the ItemF--Direct support or aviation Intermediate level can remove, replace, and use theitemH--General support level can remove, replace, and use the itemL--Specialized repair activity can remove, replace, and use the itemD--Depot level can remove, replace, and use the Item.(b)The maintenance code entered in the fourth position tells whether or not the item is to berepaired and identifies the lowest maintenance level with the capability to do complete repair (i.e, perform allauthorized repair functions.) NOTE: Some limited repair may be done on the item at a lower level ofmaintenance, if authorized by the Maintenance Allocation Chart (MAC) and SMR codes. This position willcontain one of the following maintenance codes:3
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