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A pilot enters a prolonged 20 degree banked turn on instruments. On rolling out the attitude indicator shows a small bank in the opposite direction before slowly correcting.

What has occurred?

  • A.Turn error, as centrifugal force displaced the erection sensor
  • B.The gyro has toppled
  • C.Acceleration error from the airspeed change
  • D.A genuine bank has developed

Answer: A

Centrifugal force in the turn displaces the pendulous sensor, so the erection system precesses the gyro slightly away from true vertical. The residual error decays as the erection system brings the axis back once the turn ends.

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