Hey all,
I've been starting to learn the A320 based off a tutorial J Van E wrote here. I've been following it well and almost everything is working. However when the plane goes into descent and asks for more drag, I pull down the speedbrakes lever and it doesn't seem to do its job. The plane takes too long to slow, and because of it the plane doesn't descend fast enough and goes off from its vertical path. I am going into descent just before the TOD arrow and that's all working fine.