Originally posted by Lyman ... Ref THS ...
Logic demands some movement post apogee with ND from PF. None is in evidence.
Post apogee the Elevator was mostly at 30° NU and never came below 15° NU - short term. Why would the THS need to follow?
Excerpt from Owain Glyndwr's explanation ...
For virtually the whole of the event, and certainly for the whole time the aircraft was stalled, the THS had a positive AOA so that it was generating upwards lift and a nose down pitching moment despite the fact that it was set at -13.5 degrees! This is consistent with it being a stable aeroplane as shown by that pitching moment curve. Of course the net HS lift was negative and the net pitching moment positive (nose up), but this was made up of a very large downwards lift from the elevators partly offloaded by the positive lift from the THS itself. If the elevator had been returned to neutral the THS lift would have given a ND pitch and attitude reduction. Look at the traces - that is exactly what happened!
The nose was being held up by the application of elevator.