Angel of Attack wrote on Apr 14^th, 2021 at 1:31am:

Your T/O flow is wrong. however I doubt that along would cause real aircraft to overspeed. I thinke Real Boeing would have more thought about how the AP would behave when mishandled. Try the proper flow to see if that works: 1.For 75/67, VNAV should NOT be armd on ground for TO 2.TO/GA button on TMSP should be select on pre-flight flow even before doors closed and engine started, but it's OK-ish to press here. 3.after lineup with runway and cleard for T/O, you should manually throttle up to about 1.1EPR, let the engine stable, and then press the EPR button above SPD button to engege AT.   also, make sure you have turned F/D on on the ground, and the FMA shows       | TO | TO , before taking off. 4.Gears up, at Thrust reducing Altitude (above 400' at least, but normlly at 1000' , or 1500' for NADP), press VNAV or FLCH, the thrust mode should automaticly change to CLB, no need to press button on TMSP. lower the nose for speed up and retract flaps on schedule at accl alt.

Thanks, I will try your flow later tonight. I do have FDs enabled and TO TO mode is shown, so that was always in line.

From my understanding, VNAV activation depends on airline policy - some airlines require it to be activated on the ground, and some give you a little more flexibility on that, but I am not positive that it's the case with a 767. The weird part is that I am not experiencing this overspeed issue on the 737 by CS, or the 757 by CS, or on any Boeings by another company, so this is something that has happened twice (both flights I have ever done on the 767) and it has me puzzled.

Even if the TO procedure is not exact, once I press the SPD button and preset my speed to .80, the AT should then adjust the power level down to get out of that overspeed condition, no? And if I am not in the SPD mode but in VNAV in cruise and I have the VNAV SPD annunciator lit up on PFD, it should really follow the setting from the FMC, no? It just seems that even if something during takeoff wasn't done 100% by the book, I should still be able to select SPD mode and it should reduce the power to attain the setting I have dialed in, right?

The weird thing is I don't really get this issue on descent. Once I begin descent, the speed management seems to not really be an issue, especially when I am getting close to final and gradually reducing the assigned IAS via the dial - everything is followed exactly as expected.