Discussion
During a crosswind approach with wing-low technique, the aeroplane is held in steady sideslip. Which mode is deliberately suppressed by the pilot's inputs?
Answer: C
Holding cross-controlled inputs pins bank angle and heading, which constrains every lateral degree of freedom and so suppresses all three modes for as long as the pilot holds them. That is why a steady sideslip is a static condition, analysed with control-power arguments rather than modal ones, and why the modes reappear the moment the controls are released at the flare. Suppressing only one mode would require the others to be independent of bank and heading, which they are not. And sideslip is precisely the state that excites the Dutch roll, so the last option is wrong twice over.
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