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by defrost 955 days ago
Some event (unknown) triggered multiple spikes in the "tell me three times" redundant three ADIRU units of Qantas Flight 72 causing a WTF unscheduled sudden and dramatic pitch down

https://en.wikipedia.org/wiki/Qantas_Flight_72#Conclusion

Cosmic rays were suspected but unconfirmed (kind of hard to confirm after the fact).

"All the aircaft in the world" for sixty years is kind of a large system given that currently there are on the order of one million people in the air at any moment.