Civil transport aircraft are rated 2.5g -1g clean. So yes. Pull a Warn Elec or MAWEA cb to get rid of the annoying bank angle reminder and off you go. Even pull a couple of ELAC c.b.s in an airbus to get into alternate law losing the bank angle protection and you could pull off this manouvre. As a passenger you would never know you were upside down if pulled off perfectly. As said in the video it is a 1g manouvre. Have you seen the video of coffee being poured as a barrell roll is carried out and the coffee just pours into the cup as if nothing was happening? Its from an old series called Reach For The Skies, the pilot, happens to specialise in flying aerobatics in a twin asymetric of all things, demonstrates it. The danger is if you bugger up the manouvre...
Sorry just seen this is repeated from another thread, see the other thread for all further questions...