Well that is interesting. The emb has only a basic FMS vnav function that is not very good, so I don't use it. The brain version works for me. It will descend well if you have the speed under control, but an icing encounter can cause a problem cos it increases engine N1 for the icing systems and the rate of descent can be much lower. All I was trying to acheive with this Q was, when on vectors with no holding a bit of slack with the Tart restriction to allow an idle glide onto 24. 06 you can make at idle from Tartn if you manage the energy right, but it has to be said I don't always.
The airbus guys just tell it where to to be at what level and it will sort it for them! Lucky sods.
Must dash, a cool beer is waiting.
D and F
