I've looped my Beechcraft a couple of times, and yes, it's one of the rare C-23s certified for aerobatics (beefed up structure, spin fin on the bottom of the tail, strakes on the cowlings, quick-releases for the doors, and g-meter). You need to pull a constant 3.5 g's through the manoeuver.
I would NOT want to fall out of the top of a loop in a 747...but I imagine you can always reboot the flight sim.
Mike
C-GTLM