Originally Posted by
kilomikedelta
Why would the software maintain the THS at its maximum nose-up position for the last 3.5 minutes of the flight?
That would be the natural reaction of auto-trim to a nose-up command by the PF.
That seems to match the description by BEA that stick-command was predominantly nose-up. Auto-trim wiould try to follow suit in order to allow centralising of stick.
Had the stick command been constantly nose-down, Auto-trim would have reduced THS angle consequently.
Sadly that continuous Nose-down command was apparently not apllied.
CVR might have some cues as to the why.