A340 GE Engine test aircraft
What do you mean
GE !!! Look at the pic / work out the A340 series...
It's a test aircraft for the
RR Trent for the -500/-600. You can even see the RR logo...
Centre gear not used when Gear blown down. If it's stuck up, as said above, fine, but limiting weights. Just becomes like an A330 gear wise.
May well be for testing it was even removed, or long term disabled...