TM 5-4310-385-23PExplanationAO- (Assembled byorg/AVUM Level)AF- (Assembled byDS/AVIM Level)AH- (Assembled byGS Category)AL- (Assembled bySRA)AD- (Assembled byDepot)ExplanationXA-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 part numbergiven, 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 maintenance authorized to USE andREPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMRcode as follows:(a)The maintenance code entered in the third position tells you the lowest maintenance level authorizedto remove, replace, and use an item. The maintenance code entered in the third position will indicateauthorization to one of the following levels of maintenance.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.F -Direct support or aviation intermediate level can remove, replace, and use the item.3Items with these codes are not to be requested/requisitioned individually. The partsthat make up the assembled item must be requisitioned or fabricated and assembledat the level of maintenance indicated by the source code. If the 3d position code ofthe SMR code authorizes you to replace the item, but the source code indicates theitems are assembled at a higher level, order the item from the higher level ofmaintenance.
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