@
HazelNuts39
"vibrations that might correspond to buffeting"
I agree with that, and I should have written before the wine glass was empty! Possibly the point I was trying to make, was that the onset of the 5Hz 0.6g (p/p) at cockpit vibrations occurred as the 0.2Hz oscillation of the pitch attitude and AoA commenced. The amplitude of this "buffeting" has risen in tandem with the increasing amplitude of the 0.2Hz longitudinal pitch/AoA oscillation.
I wonder if
PJ2 noted anything similar in the SIM? Possibly not, as that aspect of the airframe dynamics was then outside the known flight envelope.