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- Mayday Air Crash Investigation is an addictive series https://en.wikipedia.org/wiki/List_of_Mayday_episodes
- 2 planes had an unexplained uncontrolled pitch down towards the ocean in the same general area.
- Detailed and thorough investigation showed the angle of attack and speed data streams got crossed for a few samples and then crossed again.
- Computer received the wrong data samples and interpreted as stall imminent and did an emergency pitch down to recover.
- Planes self recovered because as the data streams recovered. Best guess was that a nearby base sent radio signals that created enough EMI to jam the planes’ internal data buses.
- Airbus programmers relied on their data bus being perfect and didn’t plan for data corruption on the bus.
- It’s easy to notice one data sample is out of wack and ignore it. Program defensively. Ardupilot does a better job with bad data input.
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