Probably a v/silly question from an ex Herc member of SODC(not AT) fraternity but are not the engines supposed to turn in the same direction? Video shows 1&3 going anticlock and 2&4 clockwise??
Mind you, even after 30 odd years on Albert I still can't remember which way those went but I think they were all the same direction.
But then I didn't have a window seat.
XFT