my response wasn't intended to distract from ias readings or scanning in general it was just meant to show that even during the last ntsb briefings the relationship between a t state and fd mode was explicitly highlighted which isn't to suggest that anything failed but rather that human factors seem to have been an issue here like you say that still doesn't explain how pilots managed not to monitor airspeed sufficiently unless instrument readings were way off which we have no reason to believe atm however this is something that was explicitly mentioned as a possibility by alpa and the ntsb still didn't evaluate of the fdr parameters b fctm b fcom