Which is why the A380 only has 1 f/d switch. You have to ensure that the auto thrust is in SPEED mode hence both f/d's have to be switched off. It has nothing to with who is Chuck Yeager and everything to do with system design. Unfortunately, there has been a lack of understanding of this since the early A320 days including at least 1 well documented fatal accident; if the FCOM says f/d's off for visual approach then this is not open to interpretation. If 1 f/d is on then the auto thrust could be in THR IDLE and therein lies potential catastrophe.