Thanks for the answer. So, the 1250'/min will not be maintained with thrust unless the speed window is closed?
If, after I reached 330 knots, I inserted 330 for a descent speed into VNAV 3/3 and closed the window, would it attempt to shallow the descent with thrust to 1250'/min to intercept the path?
ADDENDUM: For what it's worth, I just tried this scenario above on my computer with some old Aerosim 747-400 training software as well as the PMDG 747-400 software and found that thrust will not increase until the speed window is closed. Close the speed window with 330 knots in the CDU and the thrust comes in right away to reduce the descent rate to 1250 FPM. So, if those are modeling the airplane correctly (presuming the -400 operates like the 777 in this regard), then I have a partial answer.
It would be nice to see something on this in writing though. I have a 777 FCTM, Rev. 4 (Feb 20, 2014) and I don't see anything that would explain the above action.
Last edited by cf6-80c2b5f; 10th Mar 2015 at 07:07.
Reason: Additional Information