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[–] 19971421? ago 

But you aren't looking behind every panel to check every inch of the data wiring are you? A CANbus hack could be clipped on anywhere.

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[–] 19971510? ago 

https://ssl.c.photoshelter.com/img-get2/I0000ZPnubKzeoX4/fit=1000x750/MG-8464.jpg

See the autopilot breaker in the bottom left? Pull it. Squak 7700.

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[–] 19971602? ago 

I don't follow you. I don't know planes but I do know embedded systems in general. OP is right, if you have any CANbus gear it is hackable. There is no authentication so anyone who gets physical access can override what's on the bus. Imitate any device and modify any data. As to how this applies to airplanes specifically I don't know, but that's just how such a bus works. Maybe you can fly manually but your instruments are screwy, I don't know what is possible and of course it would depend on the specific plane.