Originally Posted by
JD-EE
...
edit: And it cites the sudden change as being downwards from 275 knots, the
cruise speed. So there was apparently, in the data presented, no prior increase in speed.
Just to point out there would be no visible increase in indicated speed if common drain blockage gradual and indicated speed is under auto control. And Mach 0.8 @ FL350 @ ISA +10 is closer to 272 knots according to my calculator, probably within 'about' and lines up with the rudder travel limit.