Originally Posted by awblain
Isn't the phugoid period of order 10-20s, and so near the ground, at close to maximum angle of attack, and with a big change in thrust, would it be perceptible in light of other changes?
I really don't know that much about phugoids, and nothing about that of the A320. I merely stumbled on the phugoid when calculating cruise upset trajectories of the A330/340. In that case the period was of the order of 60 - 80s. The point I was trying to make is that increasing thrust doesn't instantly put the airplane in a steady climb at Valphamax.
Am I right that the reason to damp the phugoid is for comfort when making subtle changes when cruising
The two accident/incident reports (Hudson and Bilbao) mention phugoid damping in the alpha protection mode only.