NorthernSky. .. .Thanks for putting everybody right about my duff gen. Good job.. .. .What I should have said was "All auotpilots and Flight Control Systems (that include a stall protection capability in their spec) use AoA to avoid the stall" . .. .Sometimes in an attempt at brevity it is all too easy to finish up misleading others, which is an extremely undesirable thing in aviation.. .. .Regards