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A comment on Lack of redundancies on Boeing 737 MAX baffles some involved in developing it. Parent comment

Re:Lack of redundancies on Boeing 737 MAX baffles some invol... by danaliv on Tuesday April 02, 2019 @11:48PM (#19560562)
Are you talking about a turn coordinator? That doesn't show "down." The sum of forces acting in a coordinated turn will keep the ball centered even though the airplane is banked.

Also I'm not sure what you're talking about with using the real horizon as a backup to the artificial horizon. It's not meant to be a redundant setup. Artificial horizons aren't required for visual (looking outside) flight, and relying primarily on the instruments in visual flight is an error.

In clouds/poor visibility, the cross-check for the artificial horizon is provided by the other flight instruments: airspeed, altimeter, turn coordinator, vertical speed indicator, and directional gyro (or their equivalents on an electronic display).

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Re:Lack of redundancies on Boeing 737 MAX baffles some invol... by dragonsky67 on Wednesday April 03, 2019 @01:17AM (#19560954)
The point is that you are using a different type of device to cross check the reading from the first. In the case of the faulty sensor, it sounds like they are using the same type of device therefore conditions that impact the effectiveness of that device will likely impact more than one of them.
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