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Four months ago there was a post of another article from theregister.co.uk about another bug. The cockpit/flight deck displays went blank if a Boeing 737 landed at any runway that was oriented at 270 degrees true.

https://news.ycombinator.com/item?id=21991087



That sounds more dangerous than this one, but flying the wrong missed approach or departure is far more dangerous than any display/instrument failure because the crew wouldn't be aware of the problem. If the flight display fails you look at the backup instrument and keep flying, every crew is trained for that.

But if the missed approach or departure procedure is wrong the crew has a high probability of not noticing it (this all happens in a very high workload situation). If you don't notice you can't fix it. What makes it worse is that this bug happens in situations whether the procedure requires a turn "the long way around", they wouldn't design the procedure that way unless it's really necessary. So there is a big chance there is terrain or an obstacle on the other side.

Source: I'm a commercial pilot


Oddly enough, I think the software in both cases is written by the same company: Collins Aerospace.




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