Yep, top of descent if you pull for open descent and then don't close the thrust levers it will basically fly level holding the speed waiting for you to do something....Elevators controlling the speed.
During descent If you were in Managed Descent and manually increase thrust it will speed up and most likely overspeed 5 Kts ( overspeed protections ) before pitching up in normal law. It will also ask you to extend Speedbrake.
Just fly it in open descent to keep it simple, I wouldn't complicate things by using managed. Vary the V/S as required by increasing or decreasing thrust a bit.
You could select V/S to control the V/S but then you'd still need to move the thrust up or down to fly the speed you want. Elevators now controlling the V/S.
Either way, Just keep an Eye on the speed AT ALL TIMES.
Last edited by ACMS; 4th April 2015 at 11:41.