On Thu, 17 Mar 2005 at 03:47:12 in message
, Ralph Nesbitt
wrote:
So did the airframe meet design requirements for gust loading, yaw
deflections and angles, control movements, negative and positive 'g'
etc? If it did not, then why not? Are the design requirements wrong or
did the airframe fail to meet them? Another factor is to what extent are
safeguards against excessively loads built in to airliners and to their
requirements?
--
David CL Francis

IRC the rudder went stop to stop several times in ~ 10 seconds. IMHO a
question which was not adequately addressed by the investigation was why the
rudder went stop to stop not once but several times. The rudder travel is
supposed to be limited at the speed the A/C was moving at the time the
rudder went stop to stop several times.

So that was more than enough to develop a pilot induced oscillation that
could easily drive the aircraft beyond its yaw limits. Time your
reversals so that they do the opposite of a yaw damper and you could
well go beyond any normal load case.

I was also told that the yaw damper was not switched on even though it
is a check list item?
--
David CL Francis