I am currently working as a 737 Sim Instructor. We teach no rotation equals severe damage. On the instructors panel, selecting this function simulates no N1 and no N2 with no vibration. The only difference to a straight failure being a distinct 'pop' during the actual failure itself. If the candidates treat it as a simple failure to be tackled at the end of the fourth segment, it programs a fire before they reach this point. The Civil Aviation authority we work under treat no rotation as severe damage and expect shutdown in the second segment.
I have had a failure of this nature in real life, although it was a JT8D. It sounded like a bucket of bolts spinning around with initial vibration but once it seized, no vibration at all. There are limitations to even modern simulators and despite the, 'Just like the real thing' sing song they are not and never will be.
Last edited by By George; 17th Nov 2020 at 23:41.