Revision Authorization Document
ASME Y14.34 :
A document recognized as the authority for making a change to a drawing or associated documentation. Revision authorization documents are frequently identified by terms such as alteration notice (AN), advance drawing change notice (ADCN), change in design (CID), drawing change notice (DCN), engineering change notice (ECN), engineering change order (ECO), engineering notice (EN), engineering order (EO), or notice of revision (NOR) (see ASME Y14.35).
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