Early on, we did some exercises using the doors to generate enough drag to steer the aircraft. Simulating loss of specific flight control surfaces. In the end, I think that my instructor had to employ those techniques to prevent the aircraft where he was a passenger from crashing into homes around Ensenada. The end assessment was a locked up control surface due to improper maintenance. Since he is no longer with us, his name was Ralph Buck. He was an instructor at Flying J Aviation at Brown Field south of San Diego. Over 50,000 hours of flight time and dead over improper maintenance of the aircraft where he was passenger.
My CFI was a Delta captain and built homebuilt aircraft in his spare time. That was almost 50 years ago - once I got a job that prevented me from flying at least once a week, I felt I wasn't sharp enough and quit. Still have my ticket but my medical isn't current.