TM 10-1670-296-20&P 0065 00 0065 00-3 SOURCE CODE – continued EXPLANATION - continued XC - Installation drawings, diagrams, instruction sheets, field service drawings; identified by manufacturer’s P/N. XD - Item is not stocked. Order an XD-coded item through normal supply channels using the CAGEC and P/N given, if no NSN is available. NOTE Cannibalization or controlled exchanged, when authorized, may be used as a source of 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. Maintenance Code.Maintenance codes tell you the level(s) of maintenance authorized to use and repair support items. The maintenance codes are entered in the third and fourth positions of the SMR Code as follow: Third position.The maintenance code entered in the third position tells you the lowest maintenance level authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate authorization to one of the following levels of maintenance. MAINTENANCE CODE APPLICATION/EXPLANATION C - 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 item. H - 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.
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