The Roselawn incident and the DTW brasilia incident changed procedures. After that you could not use the autopilot in icing conditions, everything had to be hand flown. The autopilot masked the corrections required during ice build up. After a while the autopilot would kick off and send the aircraft out of control. I wonder if that rule is still in effect? Was the autopilot on, masking the corrections required because of the ice build up. Just speculating......God speed to all.
Any of you recall the DHC6 video made by NASA engineers intetionally flying into ice and then inducing a tail plane stall? To Those of you who have seen it remember the final thing the Captain said, "We're not doing that again!!!!!!!!!!!!!!" that is some wicked stuff.
It was just released from the NTSB, that the A/P was ON at the time of the crash. Also reported, evidence of the wreckage, shows the A/P still in the 'engaged' position.
So I guess with the A/P ON, they had absolutely No idea of the control forces on the A/C as a result of the ice.
NTSB news conference today at 4:00PM EST.
For what its worth.
PD