Dear Amber Nectar
the B737 had rudder hardover concerns stemming from a fatal crash or two or three depending on your views .
I was flying the 737 as captain at that time and we received training on rudder hardovers in the simulator.
Selection of certain "crossover" airspeeds in which the ailerons/spoilers had more authority than a rudder hardover allowed for some control, followed by turning off the rudder.
IN addition to this, differential thrust on the engines could also be used, but was not the first course of action.
Rudder hardover in light planes would be inconceivable as the controls are not hydraulic boosted. The condition would be impossible to happen
There are many things we train for. On one type we trained for deployment of thrust reverser in flight. The plane (DC9) was well controllable with the thrust reverser deployed in flight, by following the procedures. You can even view this on youtube, look up the MD80 promo film, near the end they show it happily flying with one reverser deployed.
I do not echo the idea that you would die below 10,000'.
Good luck and WHY do you want to know?