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Fully powered controls remove the pilot's feel of hinge moment, so

  • A.Stick force per g becomes irrelevant to certification
  • B.Hinge moments no longer need to be estimated
  • C.An artificial feel system supplies a force gradient
  • D.The pilot flies by trim changes alone, with no gradient available at the column

Answer: C

With hydraulic actuators carrying the load, an artificial feel unit provides the force the pilot feels, commonly scheduled with dynamic pressure so the aeroplane feels heavier as it goes faster. Requirements on force gradients and force per g still apply, since they exist for the pilot's benefit rather than as a property of the aerodynamics. And hinge moments still matter enormously, because they size the actuators and set the hydraulic system's power. That is why a surface carries several devices at once, each answering a different complaint.

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