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Finally, you will have a one-to-one with a guy who will know more than you ever will, so, no bullsh1tting. If you don't know, say so. This person may be a DER or Designated Engineering Representitive. DER's are extremely experienced A&P's with Inspector Authorised ratings who are authorised to act on behalf of the FAA and will have been there, seen it and done it (CAA take note). Because they are from our side of the fence, they can smell a porky pie before you even say it, so be totally honest.
I believe you are confusing a DME for a DER. A DME, Designated Mechanic Examiner is the person authorized to administer the oral and practical exams.
A DER holds a university issued engineering degree and is not authorized to administer mechanic examinations