[dikei]

It's more complicated than that, in the link, they described it better:

>> The microcontrollers, running on PowerPC processors, received three commands from the three flight strings. They act as a judge to choose the correct course of actions. If all three strings are in agreement the microcontroller executes the command, but if 1 of the 3 is bad, it will go with the strings that have previously been correct.

This is a variation of Byzantine Tolerant Concensus, with a tie-braker to guarantee progress in case of absent voter.

[denton-scratch]

> Byzantine Tolerant Concensus

I was taken to task for mis-spelling "consensus"; I used to spell it with two 'c's and two 's's, like you. It was explained to me that it's from the same root as "consent", and that's how I remember the right spelling now.

[dikei]

Good point.

[mcbutterbunz]

I’m curious how often the strings are not in agreement. Is this a very rare occurrence or does it happen often?