August 23, 20196 yr Recently I have been having a problem with 777 maintaining altitude. take off and climb is no problem. i set cruise altitude at 380. i reach the altitude setting and the 777 levels off at that altitude. about an hour later i will check on the flight and the altitude is now 400. when i descend to the original altitude the plane levels off. then it starts to porpiseing and become unflyable. I cant figure out what I'm doing wrong.
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