Discussion
An autothrottle holding indicated airspeed has what effect on the longitudinal modes?
Answer: B
Speed is half of the phugoid's energy exchange, so a loop that holds it removes the mode's freedom and damps it. That is why speed-hold and altitude-hold are the two effective cures for a poor phugoid, and why a pitch damper is not. Engines cannot respond in the second or two the short period lasts, and thrust makes almost no moment contribution in any case, so that mode is untouched. Nor is any stiffness added, so the short-period frequency stays where the aerodynamics put it.
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