some politician spouting off that he will have to be 1000% sure the 787 is safe before it goes back into service. It seems this has become a vague criteria for ungrounding. Everyone knows 1000% safe is imposible, however 100% safe is also not posible. Unfotunatly nothing is 100% safe. We can probably get to a point where it can be 99.999% safe but with all the hysteria I dont think any politician or FAA official will be brave enough to make that call.
CG
The standard is pretty much set by 25.1309, not sure what the fuss is over by the politician's, maybe they need to learn to read n' rite while they stuff pork into their constituents, and the columnists may benefit from doing some research instead of parroting opinions from a website, and then squealing like the aforementioned piglet. That standard has it's basis in MIL STD-882 (now rev D) FWIW.