The A320 is capable of a surprisingly rapid rate of descent if called for. One day, when I was a new F/O on type and new to jets, we received an ATC clearance which required a higher than normal rate of descent from a mid flight level. I knew this was achieved by disconnecting the autopilot, so that full speed brakes could be applied, and selecting a speed just below the barbers pole. This caused the VSI to proceed well into the amber and gave a very good view of the whites of the Captain's eyes. We easily met our ATC requirement.
