Originally Posted by
NE_Pilot
If you do not know the answer, don't try and make something up, just let them know you are unsure but you know where you can find it (make sure you know were to find it obviously), and then find the answer.
This is one of the biggest things I heard my DE griping about. He told me more than once (outside of checkrides) that some people don't realize that "I don't know" is a perfectly acceptable answer on the oral portion of a checkride. You don't have to know every little tiny detail, but for the stuff you don't know, simply say so...but know where to find the information quickly (ie don't search for it, know exactly where to find it).