Originally Posted by
ThreeIfByAir
Is there some kind of auto-dump that happens on the 777 when the crew tells it they're planning on an overweight landing? Is there some imaginable software misfeature that turns on dumping automatically?.
No, there is no "auto-dump", The crew need to positively arm the dump system and then open the jettison nozzles to get the process started. The only obviously "automated" feature is one previously mentioned - if the crew don't intervene any further the system automatically defaults to stopping the dumping when the aircraft gets down to Maximum landing weight. The crew can choose to override that figure.
Never heard of dumping starting automatically...