re: 737max crashes in Ethiopia. Killing 157

quote:

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But the MCAS was designed to take a reading from only one of them...Alternatively, the system could have been designed to check that the angle-of-attack reading was accurate while the plane was taxiing on the ground before takeoff, when the angle of attack should read zero

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Poor.

For something that important, the sensor really should have been checked (automatically) when they were on the ground. Just a simple (sensor1 - sensor 2) and use the one that shows read zero if there was a difference.

I understand why you'd want to feed just one signal in, but for something that vital you'd want to verify that primary instrument was working properly and be able to seamlessly shift to the other if it wasn't.