You're asking this on the caf?That looks very strange indeed.
I have to ask: Are you just sitting at home looking at random flights?
Yes. They have to dump the fuel incase or an emergency landingAre they not able to land with too much fuel or something?
That particular plane can takeoff with around 13 tonnes more than it can safely land with. In an emergency it can land full but it's much more dangerous and likely to damage the wheels and brakes.Are they not able to land with too much fuel or something?