I had a little question which I couldn’t find the answer on the Infinite Flight guide.
When there’s both a center and an approach frequency, I suppose that, at your TOD, you must request a descent on the approach frequency if you’re below FL180 and center if you’re at or above. But when you descend and you end up below FL180, you have to switch the frequency to approach.
My question was: do you have to request again a descent to the approach frequency or not?
I apologize in advance for my lack of knowledge about that. I joined IF less than 2 weeks ago!
Thanks in advance for your help!