Hi there,
A little question about the AP disengagement. On the graphs at the end of
http://www.atsb.gov.au/publications/...070_prelim.pdf
(report on Qantas incident), we can see that when AP1 disengaged, a drift in altitude was initiated and it seems to be corrected (see also elevator position) only when the AP2 was engaged: is it common when the AP goes off, that a drift is being observed on flight parameters ?
Jeff