I hope someone can give me some advice. When I click on the nav button on the bendix-king Ap the Alt hold kicks in and locks in the value that shows in the VSI. The VSI value has to be dead on zero so that the plane doesn't climb or decend. Using the trim wheel doesn't do any good. The other anomaly I have noticed is that when the radial is intercepted the AP make the plane do S turns until it settles down and tracks properly. Another question. Is there a way to make the AP track (work) on nav 2? Maybe FS is coded so that it wont work that way but it would be nice if it did.Paul

Hi,Your last question:In fs9 it is possible, don't know in fsx.Jan