Are there any structures experts out there that would like to comment on our perception of the effect, rather than the cause, of this incident.
As we said before, the effect was severe vibration which caused the cabin sides to move in and out approx. 10-12mm (incidentally, I have moderated this from what I was saying when I first got off the aircraft to allow for the fear factor). I would guess the vibration frequency to be between 20Hz and 40Hz.
If we assume the cause to be flutter in the trim tab causing a vertical oscillating load at the horizontal stabiliser my interpretation of what we experienced is that the fuselage was actually ovalising where we sat in the overwing position. If this is the case would it be right to assume those to the front and rear of us experienced greater vibration, particularly vertically, than we did.
If this is the case my sypathies are with them.