On many Boeing aircraft I believe a synthetic voice will call "Airspeed Low" when the speed is in the yellow band (or it may be the PM reading the EICAS caution message) ...this may be a "Customer Option".
When the CVR is transcribed we will have a better understanding of all the human and synthetic voices in the final few minutes. (Rad Alt, EGPWS etc.)
Last edited by ZimmerFly; 11th Jul 2013 at 08:02.
Reason: Old age and fading memory