Originally Posted by
GreatChecko
... Just reading the quote, it approves following the manufacturer procedures, but simply recommends that the autopilot be turned off. I still don't see how the crew erred or deviated from what the FAA said.
They used an autopilot mode that does NOT control speed. The requirement is for the pilots to control speed. That would appear to be how the crew erred or deviated from normal guidelines.
Use of autopilot also made it difficult to diagnose the stick shaker, because they had chosen to ignore whatever evidence they could have gained from hand flying.
But loss of speed to near Vref+20 with gear down and flaps zero was the key problem.