I can add to Uplinker's comments about taking off with 3 engines, having done so in the 146 for real, not just in the sim.
From memory, the engine opposite the dead engine is initially set to a low setting, having pre-determined and marked the appropriate higher setting on the thrust lever housing. At a given airspeed, the thrust is increased to this pre-determined setting, progressively. Even with inboard engines involved, and significantly de-rated thrust on the asymmetric engine, the swing is significant, and requires careful handling.
As for some believing that a single engine take-off is approved, sensible, or even survivable seems incredible.
Perhaps there is a special, previously unknown friction phenomena afforded by special snow on this runway that magically helps the nosewheel to maintain perfect tracking below Vmcg, against the enormous moment caused by the asymmetric thrust, where mere tarmac just can't cut it. Just sayin!
Last edited by pilotmike; 3rd Feb 2017 at 16:58.