N0016719Q0089_Answer_to_Additional_Question.docx

Answer to Additional Question It would be acceptable to perform the acid etching at a vendor or third parties facility so long as: (1) the process for the acid etching has been validated to ensure that material removal from etching does not exceed two mils (0.002 inch) and (2) that the process for acid etching is documented in writing—either as a stand-alone etch procedure to be included as an amendment to the dye penentrant inspection procedure or alternatively the etch process could be incorporated directly into the penetrant procedure.