Originally Posted by
Scoop
We had a MD-90 that Captains used to call "Flipper" all the way back in 2005/2006 when I was flying the 90's out of SLC. It would very mildly, yet constantly porpoise up and down when at cruise with the AP on, thus the "Flipper" moniker.
Also, this was before we got the 90s from China, so unless there is another Flipper I'm not sure the "China" part is deserved.
Scoop
The China part IS deserved... unfortunately there is more than one that earns that moniker.
The DAL 90's are pretty decent, except for that particular one with the porpoise. The Chinese 90's tend to almost ALL do the "upndown"....