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An angle of attack vane measures

  • A.The sideslip angle
  • B.The angle between the chord line and the relative airflow
  • C.The aircraft's pitch attitude
  • D.The flight path angle relative to the ground

Answer: B

Because stall occurs at an angle of attack rather than at a speed, the vane gives a warning valid at any weight or load factor. That is the argument for stall protection based on it rather than on indicated airspeed alone.

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