A321 Porpoising

Everytime i use the a321 the nose starts pitching up and down very fast. How can i avoid this?

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This is a known issue. It should be fixed soon in the future.

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It’s a known problem

This is a known issue,
To fix this, instead of setting the autopilot to hold your cruising altitude, set your autopilot’s altitude above your cruising altitude and set your vs to 0 once you reach your cruising altitude gently.
This solved the problem for me.

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Love that !!!

+1 to your comment. Setting the V/S to zero works for me.

for me, it seems to be fine, it only pitching up and down when it’s over 540 knts