Originally Posted by
Broncofan
Never flown the Bus. I know it’s bad, but what does Direct law mean? What systems don’t you have?
As you go from normal to alternate to direct, you lose protections along the way. In direct law you have none, you move the stick and the control surface moves proportionally. Since there's no mechanical feedback in bus FBW you have to be careful. You also have to trim manually with the wheel.
Law degradation can be caused by a variety of system failures, but it takes multiple failures to even get to alternate.