Re: Background
The B737-MAX has 2 AOA sensors. one goes into Flight Computer 1, one goes into Flight Computer 2. MCAS uses one FC, alternating each flight (to the best of my knowledge). There is also no display of the AOA data from EITHER sensor, or an AOA-Sensor-Disagree light, UNLESS YOU PAY EXTRA FOR THEM.
Lion Air did not pay extra. Therefore the pilots could not know that the AOA was wrong, even if they had known about the MCAS system and what it did/would do in those circumstances. Which they did not, as they had not been trained, and MCAS is not mentioned in the MAX manuals apparently (well, it wasn't before the incident, probably is now)
I do not know at this stage whether Ethiopian did.
Biting the hand that feeds IT
