Originally Posted by
wiggy
I know VNAV has it's quirks but FWIW I had few thousand hours on the T7 and can't say I ever saw what you describe happen as a matter of routine.
Given old age I can only guess I'd be suspecting maybe winds (the point Uplinker made)/ or, and I'm clutching at straws here - programmed descent speed vs. programmed cruise speed - does it routinely happen if you transition from Econ cruise to Econ descent?
That's usually when I see it. Winds were my first thought as well, but I'm not sure that's it. "Routine" might be an exaggeration but it certainly hasn't been a one-off. I'll see it a couple of times on a given trip and then not see it for a couple of trips.