Quote: for digital flight-control use synchronous channels, sensor data to all channels, and exact-match majority voting; needs fault-tolerant clock synchronization, etc.

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The favored approach [to redundancy management of digital flight-control systems] uses synchronized channels, distribution … [refs.] [Each channel should produce the same outputs.] Channel failures can therefore be masked by exact-match majority … Of course, it is crucial to this approach … [Requires Byzantine fault-tolerant clock synchronization]   Google-1   Google-2

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