I agree that there should be three AoA sensors, as Airbus already has, if you're going to connect the AoA sensors to a control surface.<p>But Hansman's comment seems (very surprisingly) inaccurate, because my understanding is that the MAX is not actually aerodynamically unstable: the lift from the nacelles results in a non-monotonic backpressure on the yoke as AoA increases, and that violates airworthiness regulations on yoke handling. But the plane isn't going to fly itself into a stall. The pilot has to do that by pulling back on the yoke at high AoA (and with less backpressure than a 737 pilot would expect).<p>That's not an unstable plane, in the sense that the B-2 bomber is unstable. It's just a plane that handles differently to pilots who originally trained on different but related planes.