Originally Posted by
DMEarc
With that being said, to excercise the Certified Flight Instructor Certificate you only need a 3rd Class Medical.
Currently one does NOT need ANY medical to exercise the CFI certificate. One needs at least a third class medical to ACT as PIC.
A CFI can instruct WITHOUT acting as PIC. I'm doing it, friends are doing it. Your flight instruction client has to be rated and qualified in the plane plus have their medical so they ACT as PIC.