On: U.S. to ground Boeing 737 Max 8

[dlgeek]

One on each side, but only one per flight computer (flight computers are redundant, but only one is active at a time).

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Additionally, there is an optional feature to add a cockpit warning if the two sensors disagree, which could have helped the pilots diagnose the issue in the case of the Lion Air crash. The Lion Air plane did not have this option; not sure about the Ethiopian plane.