Discussion
The spiral mode is characterised by
Answer: C
The spiral is the slowest lateral root, a gradual change of bank and heading that on many aeroplanes is mildly divergent: left alone, a small bank tightens into a descending turn. It is tolerated because it is slow enough for a pilot or an autopilot to correct without effort. A rapid sideslip oscillation is the Dutch roll. A fast roll-rate decay is the roll subsidence. Pitching motion belongs to the longitudinal problem entirely, which decouples from this one for small perturbations.
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