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Why is stick force per g normally specified per aeroplane class and flight phase?

  • A.Because the certification basis has no other structure
  • B.Because the acceptable range depends on the mission and the size of the aeroplane
  • C.Because the hinge moment coefficient is itself a property of the aeroplane class
  • D.Because heavier aeroplanes have lighter controls

Answer: B

A fighter in combat and a transport on approach make very different demands, so the acceptable band is set by class and by flight phase, exactly as the modal requirements are. Hinge moment coefficients are properties of a surface's geometry, not of a class. Heavier aeroplanes tend towards heavier controls unless powered, so the third option is backwards. And the specification structure follows from the engineering rather than the reverse.

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