Originally Posted by
BDAttitude
Well this is not my center of expertise, but if the risk of rudder cables being cut by shrapnel due to modified engine position and increased piercing capability due to increased moment of inertia and particle size this may not simply be grandfathered.
I think you mean momentum, rather than moment of inertia (though KE might be a more appropriate metric), and I don't really see how raising the engine (but with a thrust line the same distance from the aircraft's centreline) would make that much difference to the risk.
But re grandfathering, it's tempting to wonder at what stage in the Max development did Boeing wake up to the possibility that the heavier fan and HPT on the LEAP engine meant poorer containment characteristics, if indeed that's the case (npi).