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Which is the first thing to check if a manual control feels unexpectedly heavy after maintenance?

  • A.The Dutch roll damping
  • B.The lift curve slope
  • C.Cable tension and rigging
  • D.The aeroplane's static margin

Answer: C

Rigging and cable tension are the first suspects, along with friction in the run and any misassembled balance weight or tab linkage, because they are the things maintenance can have changed. Static margin depends on loading and would show as a change in trim behaviour rather than in friction-like heaviness. Dutch roll damping and the lift curve slope are aerodynamic properties that maintenance does not touch. Reasoning from what was recently disturbed is the quickest route to the cause.

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