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> Modern fly-by-wire planes are said to have 12-way voting Do you have a source for that? Everything I've ever read about Airbus says the various flight contro
by jcalvinowens 3y ago
> Modern fly-by-wire planes are said to have 12-way voting
Do you have a source for that? Everything I've ever read about Airbus says the various flight control systems are doubly redundant (three units). Twelve sounds like it would be far beyond diminishing returns...
- jojobas 3y agoThat was word of mouth. This website says 5 independent computers, of which 2 use different hardware and software so as not to fail in the same fashion. https://www.rightattitudes.com/2020/04/06/airbus-flight-control-system-single-points-of-failure/ https://www.rightattitudes.com/2020/04/06/airbus-flight-cont... I'd imagine every computer relies on redundant stick/pedal encoders, which is how a 12-way notion appeared.
- jcalvinowens 3y agoThat blog isn't very authoritative, and doesn't go into any detail at all. > I'd imagine every computer relies on redundant stick/pedal encoders, which is how a 12-way notion appeared. That's disingenuous at best. The lug nuts on my car aren't 20x redundant... if you randomly loosen four, catastrophic failure is possible.
- fulafel 3y agoThere's several subsystems that have backup functionality or piloting fallback available incase of subsystem failure, and subsystems have internal 2-weay or 3-way redundancy/voting. See eg https://aviation.stackexchange.com/questions/15234/how-does-the-airbus-flight-computers-voting-system-work https://aviation.stackexchange.com/questions/15234/how-does-...
- numpad0 3y agoThis shallow dismissal sounds "sus". It's just off.