Yes, true! I have sent several of my CFI candidates to FSDO and that
very question was part of their oral. Acting as PIC and instructing, say
a primary student, you are not being paid to carry that student as
passenger, just to instruct, so no second class medical needed.

Peter Duniho wrote:
"Bill J" wrote in message
...

You DON'T need a second class to 'fly and instruct'. You can do any
instructing with a third class, or lots of instructing with no medical.


Not true. You need a 2nd class medical any time you are being paid to
exercise the privileges of your pilot certificate. If you are not acting as
PIC, you need no medical at all, but if you are, you need a 2nd class
medical (and a commercial pilot certificate, of course).

Pete