What causes this large GE90 VIB difference?

[Jet II]

Originally Posted by No Fly Zone

For the most part, a Non-Event, unless the differences are very great. To next stop or - we hope, a Mx base, you'll get there, even if one or both have to be tuned back a bit. Once at your Mx base, RAISE HELL, even of one or both engines need a change. Personally, I would not fly it again, without a dual engine change, but we all have slightly different standards.

No we dont - there is only one standard and that is the one that Mr Boeing puts in the book. This aircraft is totally within limits and I doubt that you would find a maintenance department in the world prepared to change both engines (or even just one) for this - quite why you would want to replace the right engine anyway escapes me.