Originally Posted by
tdracer
GE9X on the 777X takes bowed rotor mitigation one step further - there is a small electric motor on the gearbox that uses aircraft power to slowly rotate the core after shutdown at roughly one rotation per minute - that will even out the cooling of the core and prevent the rotor from bowing. It's commonly referred to as the 'rotisserie' for what should be obvious reasons.
Would have been a nice installation on Garrett turboprops -- where procedure is to turn it through by hand when you get out!