Originally Posted by
vilas
No! Backup speed scale is an older mod. It doesn't calculate speed just shows a green band like TCAS to fly based on AoA. That also came after 447 as a remedy. Digital back up speed is actual speed displayed on speed tape that pilot flies. It is calculated by injecting weight, load factor and AoA in lift equation. It has different indication for pilot to know it's calculated speed.
Long time coming. Is anomometric the new back up? So. Flight into known icing with triple redundant pitot probes known to be susceptible to packing up in an Aircraft that would likely startle our flight crew is not criminal? (Rhetorical)..... thanks vilas, much respect