Cloud base & FD
Many posters have wondered what could possibly have distracted the crew so badly as to leave the speed decay unnoticed.
Here's one theory. The ADS-B data shows that the aircraft passed 700 ft i.e. the cloud base level, almost exactly at the same time when the speed had decayed to Vref and the throttles should (latest) have been advanced from idle, either courtesy of the A/T (which we know was inhibited by the faulty RA1) or manually.
Maybe we have a situation with 3 pairs of eyes looking out the windscreen to try to find the runway in the haze, due to "unexpected removal of the Flight Director Command Bars during approach" which is mentioned as one consequence of the RA fault? And nobody monitoring the speed tape or paying attention to the throttles at this critical time.
Comments? Sorry if this has been posted before.