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For the B737NG, the pilot stick inputs are transferred to hydraulic actuators, via mechanical (steel) cables. For example for the Power Control Units of the ailerons, as also depicted in this question: The site where the image came from also lists a schematic pic for a fly-by-wire setup. There is still a hydraulic actuator but no more steel cable loop to ...


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Different aircraft and manufacturers take very different approaches. 1. Boeing 777 The B777 has three Primary Flight Computers (PFC) that are responsible for flight control laws computation and four Actuator Control Units (ACE) that are responsible for the closed-loop control of their responsible flight control surfaces. The ACE is primarily an analog ...


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