>> but the icing is overwhelming the heating capability and the tub tubes. >> in a highly automated airplane, if you ice over the tube you no longer have that ram air pressure, which all of these computers are dependant upon. >> with no valid air speed to work with, the auto pilot and other automated systems disconnect. the co-pilots must manually fly the plane without the ability to monitor their air speed. >> the big thing is to not make any major changes with the airplane. in all likelihood it's going to recover shortly. if you start making large inputs, things can get worse. >> with the captain still away from the flight deck, the co-pilot in the right seat, the youngest and least experienced on the crew attempts to level the plane that's being jostled by turbulence, but he over corrects on the side stick controller, pitching the airplane up at a steep angle.