It didn't budge because it never received a command requiring it to. In the sim, the trim wheel movement and behaviour seemed akin to a curve - with full nose down it started moving after a second or two, and had returned to neutral 8 seconds later.
In the case of AF447, the only time full-ND was held on the sidestick for more than a fraction of a second came right at the end by the PNF, and was counteracted by the PF pulling full-back on his.
Remember that 8 seconds to THS neutral has the elevators commanded to full ND throughout.
Last edited by DozyWannabe; 13th Aug 2012 at 18:34.