TM 5-4520-244-24PNOTECannibalization 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 byrequirements of AR 750–1.(2) Maintenance Code. Maintenance codes tells you the level(s) of maintenance authorized toUSE and REPAIR support items. The maintenance codes are entered in the third and fourth positions of theSMR code as 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 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.H — General support level can remove, replace, and use the item.L — Specialized repair activity can remove, replace, and use the item.D — 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.CodeO—F—H—L—D—Z—B—Application/ExplanationOrganizational or (aviation unit) is the lowest level that can do complete repair of the item.Direct support or aviation intermediate is the lowest level that can do complete repair of the item.General Support is the lowest level that can do complete repair of the item.Specialized repair activity is the lowest level that can do complete repair of the item.Depot is the lowest level that can do complete repair of the item.Nonreparable. No repair is authorized.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 user level3
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