The use of aileron for help with ground loop by steering toward the loop is technically valid, as MTV points out, but we learn in slow flight practice the primacy of rudder when relative wind decreases. I accept this knowledge, but don't want to go there with student's who might actually try to mitigate ground loop or worse prevent ground loop with aileron rather than rudder. Nothing is more disruptive to keeping the nose aligned with the direction of travel and in thereby keeping the wing level or stabilized in drift correcting bank than aileron. The proper coordinated control usage of aileron is a major error on short final, touchdown, and roll out.
The error of allowing the aileron to become the primary control causes much airplane damage during landing, especially at enough airspeed to make the aileron effective. On short final, touchdown, and roll out, use rudder alone to stabilize both longitudinal alignment and wing level. Yes, use aileron to counter drift and increase aileron into the crosswind on touchdown and roll out. This aileron use for drift management ends once drift is managed on final but increases upon touchdown and roll out because of decreased relative wind and decreased effectiveness of the aileron.
To use both rudder and aileron effectively we must decouple coordination during the crosswind landing and learn to leave the aileron alone in a no wind condition. Side slip to landing is not a major disruptor of landings. Pilots are generally handling that well. Aileron for wings level and coordinated turns for longitudinal alignment in no wind or slight unidentified crosswind is a major disruptor of landings. This error and too much airspeed to land on the beginning end of the runway bends a lot of airplanes.
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