Originally Posted by
FlyingStone
I would suspect high engine vibration non-normal procedure for most aircraft would involve reducing thrust when flight conditions allow and not now.
Agreed, although it rather depends on the magnitude of the vibrations.
At least in the Boeing world, high vibe indications -
by itself - did not require immediate crew action. Rather, it was informational and to be used with other engine indications to determine if there was an actual engine issue (one exception - on the RB211, high vibes could justify a shutdown due to the potential for catastrophic bearing failure leading to an uncontained engine failure).
That being said, seeing high vibes on the gauge is not the same as feeling the entire airframe shake...