Hmmm, many different opinions.
One wonders..why not look in the respectice aircraft AFM and see exactly what the manufacturer says?
Instead of pontificating, and many times getting it wrong...
And yes, RB.211's, EPR is the primary thrust setting instrument.
If you doubt this, why not call up a Roller tech rep and ask him...the answer you recieve might be enlightening, IE: something might indeed be learned.
Perish the thought....
