Thanks, I look forward to your reply. Meantime, and without the "Bird", a pilot has no heading (crab) reference, and if Rudder is used to return 447 to "En Ligne de Vol," he has a critical need to know the response his control input has had. Should he stop too soon, or too late, the Rudder gets rapidly out of sync with the Fuselage direction, and each subsequent Rudder input puts the machine more out of whack, until shock loads rip off the VS. This assumes that the Rudder has mechanical stops, but no rated deployment; the Rudder slams to its stop each time he applies any Rudder at all..And below 272 knots, as 587 shows, the engines are scraped off.