Hacker News Reader

Well there's an option for dual AOA but neither Lion or Ethiopian took it. In the case of AOA disagreement a light illuminates. Source https://twitter.com/trevorsumner/status/1106934415610073091 and https://theaircurrent.com/aviation-safety/southwest-airlines...

View on HN

That's not quite accurate. The plane has dual AoA in either case. The option is for AoA indicators and disagreement light.

So, the US airlines who bought the option will have a disagree light, but it's still the case that their MCAS is only being fed by one sensor, so they could experience the same control problems.

That is true, here's a source https://qz.com/1574441/a-warning-signal-that-could-have-prev...

A pet peeve is people not sourcing corrections

Maybe it's because we're looking at the design with hindsight, but it seems strange to me that the AOA disagreement light would be an optional feature.

Reply on news.ycombinator.com