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A little #InsideBaseball as to how #United328’s engine problem was handled, from a #B777’s #pilot point of view.. Although startling for both #flightcrew and passengers, an engine issue such as this one is something we constantly train and plan for.. 
As I mentioned on previous tweet, the aircraft handling aspect of the situation is quite normal in that the jet would have, by this point in the flight, most likely have been on autopilot, but if not, the Thrust Asymmetry Compensation (TAC) system works the same way..
In simple terms, the system compares engine parameters, and when it detects that one engine’s rotational velocity is higher than the other by a specific percentage, it applies rudder trim inputs to compensate for what it interprets as disimilar thrust..
infinidim.org/b777-tac-thrus…
infinidim.org/b777-tac-thrus…
