Flightfactor has updated the Boeing 777 series to 1.5.1.1, Note the extra .1 and not 1.5.1, although only a small change in the "corrected engine limits for auto throttle". It is however important to make sure you have the correct version.   The B777 some had some niggles. Nothing that would really spoil the simulation, but niggles they were. My main niggle was the park brake staying on when you set the auto brake (that was fixed in update 1.5.0) and it drove me senseless in the fact I did a com