great
so what is your explanation of the vibration on the approach?
I don't have one. The books I have say transverse flow. Right or wrong, that's what they say. And when it's time to take my next written knowledge exam, I will parrot the FAA answer. Meanwhile you say something else. I don't actually care about the cause, but I do care about whether or not I have ETL when I feel the vibration and that will be the experiment I perform when I next get the chance.