This nasty mode reversion really sets you up for a stall just as workload is very high in a way that is not as easy to spot as it should be.
So, you have seen a safe speed selected, and then, all by it self, it drops by up to 40kts. Not good, especially in shear. It is a quirk that should be emphasised during training, but it doesn't seem to be.
However, my post was not a hypothesis of what happened or why, or any kind of supposition about the pilots in this sad event. It was to clarify the autoflight system operation for the sake of the discussion as many on here are making assumptions about how it is used that are not right for the 737.
Wow, thanks for the detailed explanation.
