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Jonathan Goodish wrote in message ...
In article , (Robert M. Gary) wrote: I think you are missing something. If both AIs start showing different results you will be suspecious and start asking questions. As I noted a realistic AI failure situation can be very difficult to detect. How is this fundamentally different than if one AI disagrees with the DG and turn coordinator? Because, a real world situation is that the AI dies very, very slowly. There isn't that immediate "hmm, somethings wrong" like with a dead vac (alarms going off etc). The TC has enough bounce in it that there is really no way to detect small differences like 5 degrees when you are in real IMC. Once you start bouncing around in the clouds the TC starts bouncing back and forth. It will keep you upright but is far from close enough to determine 5 or perhaps even 10 degrees off. The DG you may or may not notice. In anycase two AIs being off is a pretty quick and certain thing to notice. Couple that with the fact that you have to decide which is right, the TC or the AI. If you have 3 its easier to pick on that might be bad. |
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