Quote Originally Posted by Marc Zeitlin View Post
If you have a transponder, it must be on except in class G airspace, and if it's on, you need a 91.413 check.
So if you have a transponder, but it hasn't been checked as required by 41.413, and you're flying in class E airspace where the transponder isn't required... the regs don't see to give an out, off or on, either way you're in violation?