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Free play in a control run is limited by maintenance requirements because

  • A.It can reduce the flutter margin
  • B.It changes the hinge moment coefficient
  • C.It affects the aeroplane's static margin
  • D.It alters the trim tab authority

Answer: A

Free play lets the surface move independently of the control run for small displacements, which reduces the effective stiffness of the system and can lower the flutter speed. That is why inspection limits on play are quoted in thousandths of an inch and taken seriously. The aerodynamic coefficients are unchanged. Static margin is a whole-aeroplane property. Tab authority depends on tab size and travel rather than on play in the run.

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