drseti wrote:VL Roberts wrote:No where does the regulation say "appropriate" medical.
Actually, the word "appropriate" does appear in the FARs with respect to a medical certificate. (I can't cite the specific reg off the top of my head, but I researched this some months ago.) At the time that reg was written (pre-LSA), I'm sure that by "Appropriate" they meant third, second, or first class. They certainly didn't consider driver's licenses, but those are now appropriate medical certificates in some circumstances. Furthermore, I ran this interpretation past John Yodice (former AOPA counsel), and he unofficially validated my interpretation. Although this hasn't been tested at FAA (I'm certainly not going to bring a test case, and John advised against doing so), he did say that position seemed reasonable to him, in his professional estimation.
The regulation breaks it down to operations requiring a third class and operations requiring either a third class or a drivers license. If a CFI is operating with only a drivers license he has the privileges of a Sport CFI only and instructing for Private is not one of the privileges.
At EAA.ORG there is a Sport Aviation "ask the expert" Q and A. The answer given for CFI's with no medical is that they would be restricted to the privileges of a Sport Instructor only.