I forget the reason that up in the high flight levels that idle flight N1 is somewhere near 70 - 73 % and down low 20 -30 %.
Also does it matter that the fan turns when the plane is parked for extended periods? I know engine covers do the trick but I've heard some in the know who say there is minimal if any wear on bearings in this free spin in wind scenario.
Also does it matter that the fan turns when the plane is parked for extended periods? I know engine covers do the trick but I've heard some in the know who say there is minimal if any wear on bearings in this free spin in wind scenario.