Originally Posted by PJ2
Sometimes in mountain wave conditions where the speed is increasing, the A/T will reduce the N1, sometimes even to idle if the Mach is getting close to VMO/MMO but for a twenty to twenty-five knot reduction the N1 would not reduce into what could be called "low range". Even if it actually did, it takes a long time to lose enough speed to be at risk.
I agree, and that's what we encounter most of the time when confronted to a low N1. Nevertheless, an updraft due to convective weather could initiate a similar N1 reduction, and so even if the speed was already established at M0.80
Note that the turbulence penetration speed for the 332 is M0.80 @ FL370 compared to M0.78 for the 333 I believe.