Hi Guppyeng. I also saw Boeing's video about the 777 wing ultimate load test. Amazing stuff. I used to have a hand out from Airbus about the A330/340 wing test and it stated the tips were bent up more than 7 metres before rupture occured. There were photographs of the 747-400 doing stall tests that showed the end of the wings (not the winglet tips) raised well above the top of the fuselage probably just before stall.
GLHCARL, thanks for the extra details. I did my L1011 training at Palmdale and walked the assembly line many times but it was back in 1974 and some of the details have faded from memory. I recall watching a guy drilling the holes for the wing attachment one day. He was basically using a commercial electric drill with a hydraulic jack under it to apply upward pressure and a jig to align it. Not very high tech but it worked.