On Nov 1, 8:55 am, "Bob Gardner" wrote:
On the ground, the pressure inside the airplane and outside of the airplane
are the same...why would you expect the needle to wiggle?

Bob Gardner


Are you indicating it won't? i.e. are you saying in your experience it
does not wiggle?

I expect it to move because that is what I was taught. And I have
flown a lot of these and have never seen it not "wiggle".

I am interested in how I know the knob works. Is looking for the
wiggle a reliable way to tell if the alt. static system is going to
function when I need it. If not how do I know. Should the item have
been squawked or simply noted as an observation.