SEB: . .
Wrt AoA relaibility at slow speeds. There was recently thread about rejected takeoff above V1 incidedent and investigation body's take on in. One interesting tidbit pertaining to our discussion is AoA plot from FDR from that plane as presented in the report. As speed of the plane decreased below ~45-50kts measured AoA started to deviate and at ~40kts in went completely wild (like 60 or even 90deg). That plane was on the ground so it's real AoA remained allmost constant.
447 could not have very low speed for very long. It was either moving forward, or dropping fast enough to keep the AOA vanes pointed into the relative wind.
It still puzzles me why the 330 uses airspeed input to the stall warning. McDouglas airplanes don't.