Response times of elevator and THS
Looking at the graph Dozy posted, noticed something I guess never computed before and apologize if it's been discussed to death and it just didn't make an impression. From 2:12.32 until about 2:12.49, pilot sitting in the right hand seat had predominately nose down inputs, with the first input going to the stop in the nose down direction. For this entire 17 seconds the elevators only moved to 15 degrees nose up from the bottom line of 30 degrees. The THS never moved.
Way too late, when the pilot in the left hand seat was finally given control, he input nose down almost to the stops from 2:13.45 to 2:13.52 so a total of perhaps 7 seconds until the dual inputs from the other guy evened out the inputs to around neutral. So full nose down for 7 seconds only moved the elevator to 15 degrees nose up and again, the THS never moved.
Just how long would a nose down input have to last to finally get the THS to full nose down? Took about a minute to roll to full nose up after predominately nose up side stick inputs from 2:10.47 to 2:11.45. Seems like an awful long time to have to wait in an emergency situation.
So can someone explain why it takes so long to get control surfaces to give the actions requested by the pilot. As I see it, the pilot wanted the nose down for 17 seconds and got nothing more than 15 degree nose up then the other wanted FULL nose down for 7 seconds and the computers once again only gave him nose up elevator. Does this have something to do with the cumulative inputs? Can a set of bad inputs cause the airplane to not respond quickly as was needed in this case??