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8 - ATPL - Some aircraft use a fly-by-wire system to move the primary flight controls. This system is based on:

Question 8 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Hydraulic power only.
Electrical signals from a computer sent to hydraulic actuators.
Secondary controls such as speed brakes.
Mechanical power transmitted by steel wires.

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