See here!
I don't know whether to scream or laugh at this. How on earth can it be the 'job' or responsibility of a normal, fare-paying passenger to keep an eye and an ear out for the engine noise making a fatal change? Obviously it's a good idea not to put people next to emergency exits who might have problems moving fast in an emergency - very pregnant women, for instance. But in no way is it a passenger's 'job' to be more vigilant than any other passenger on the plane, regardless of where they sit! What are the cabin staff for, ffs? 
Has anyone encountered this sort of attitude on a carrier?