TM 10-4320-303-23PNOTECannibalization or controlled exchange, when authorized, may be used as asource of supply for items with the above source codes, except for those sourcecoded "XA" or those aircraft support Items restricted by requirements of AR 750-1(2) MaintenanceCode . 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 thefollowing levels of maintenanceMaintenanceCodeApplication/ExplanationC-Crew or operator maintenance done within unit/AVUM maintenance.O-Unit level/AVUM maintenance can remove, replace, and use the item.F-Direct support AVIM maintenance can remove, replace, and use the ItemH-General support maintenance can remove, replace, and use the Item.L-Specialized repair activity can remove, replace, and use the item.D-Depot can remove, replace, and use the item.(b) The maintenance code entered In the fourth position tells whether or not the item is to be repaired andidentifies the lowest maintenance level with the capability to do complete repair (i e, perform all authorized repair func-tions )NOTESome limited repair may be done on an Item at a lower level of maintenance, ifauthorized by the Maintenance Allocation Chart and SMR codesMaintenanceCodeApplication/ExplanationO-Unit/AVUM is the lowest level that can do complete repair of the itemF-Direct support/AVIM is the lowest level that can do complete repair of the itemH -General Support is the lowest level that can do complete repair of the itemL-Specialized repair activity is the lowest level that can do complete repair of the itemD-Depot is the lowest level that can do complete repair of the ItemZ-Nonreparable No repair Is authorizedB-No repair is authorized No parts or special tools are authorized for the maintenance of a "B"coded Item However, the Item may be reconditioned by adjusting, lubricating, etc , at the userlevel(3) RecoverabilityCode.Recoverability codes are assigned to Items to indicate the disposition action onunserviceable Items The recoverability code is entered In the fifth position of the SMR Code as follows3
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