> Boeing developed a software program that constantly monitored the angle of attack. As soon as this angle became too risky, the Maneuvering Characteristics Aug

> Boeing developed a software program that constantly monitored the angle of attack. As soon as this angle became too risky, the Maneuvering Characteristics Augmentation System (MCAS) would automatically lower the plane's nose without the pilot having to do anything at all. To do so, it doesn't manipulate the rudder, but the horizontal stabilizer trim, the most forceful control surface on the entire aircraft. How could the rudder possibly be used to change the angle of attack? Isn't the horizontal stabilizer the only control surface that can do this?