But let's assume that some slick operator got the sanctioning body for the industry to ONLY require that they be a MECHANIC and that they had to be a VERY GOOD one, in order to be labeled a Certified Auto Mechanic.
I think that you, as a consumer, would be surprised (maybe even upset) if the Certified Auto Mechanic working on your car at the local garage wasn't required to have any automotive experience at all. See, he was a VERY GOOD aviation MECHANIC, and because of that, he meets the "requirements" to be called a Certified Auto Mechanic. But, what about the words "Certified Auto" in the label you ask. Well, that doesn't really matter since the sanctioning body defined the label in such a way that no automotive experience was required. He is a mechanic, and a very excellent one.