Final answer:
The Boeing 777 features a computer-based fly-by-wire system where pilots' inputs are translated into electrical signals by computers, rather than using mechanical cables. This system saves weight, costs, and allows for a two-person crew by relying on extensive computer code.
Step-by-step explanation:
The statement 'mechanical cables run from control wheel and autopilot to PCUs, rather than being electronically connected (via ACE) to the PCUs' is false when referring to modern aircraft such as the Boeing 777. Instead, the Boeing 777 utilizes a sophisticated fly-by-wire system. In this system, the pilot's control inputs are captured by computers, which in turn send electrical signals to the control surfaces' actuators.
Unlike older designs where physical cables were used, fly-by-wire allows for a reduction in weight and cost along with enhanced reliability. The system also permits the Boeing 777 to be operated by just two crew members. This level of automation and efficiency is made possible through the implementation of millions of lines of computer code that ensure precise and dependable operation of the control surfaces.