dumping fuel
Period. none of the Gulfstream 4 and 5 series incl 450 550 can dump fuel. that is the straight answer to this questions.
but than.. there is no such thing as a overweight landing in a g5 or 550 its a heavy weight landing and the onboard accelometers will determine if you need a inspection or not in case you once have to land over max landing weight.
and it is probably a good idea to burn of that extra fuel if your nose wheel is not down........ anyway.. good job you've done there dude in ZRH. i am proud of you... the beer is on me ..
CH