Interesting.
Quote:
Certain engine failures, such as fan blade separation can cause high levels of airframe vibration. Although the airframe vibration may seem severe to the Flight Crew, it is extremely unlikely that the vibration will damage the airplane structure or critical systems.
But it all still seems very subjective to me. I would hope that there is further advice that better defines the circumstances that they are describing.
Was the vibration level observed in the passenger's video "high", as envisaged by the advice from Boeing?
Or was it "extreme"and way beyond anything they ever considered? ((Not saying it was. Just asking)
And how long did they anticipate that the vibration would last or be tolerated for?