Am I right in thinking that in the case of sudden changes of wind speed/direction, either due to gusts or windshear or sudden turns, the ASI won't be quite accurate, in some helicopters at least, due to the flow of air over the pitot tube being disturbed, lag in all instruments etc? I seem to remember that's the case, and it makes sense...but I'm not saying it for certain since I'm slightly out of my depth here.