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The attitude indicator uses a gyroscope with its spin axis

  • A.Horizontal and aligned with the lateral axis
  • B.Free in all three axes with no erection
  • C.Vertical, with freedom in pitch and roll
  • D.Horizontal and aligned with the aircraft's longitudinal axis

Answer: C

A vertically mounted rotor with two gimbals gives a stable horizontal reference against which pitch and roll are read. An erection system continually corrects it towards the true vertical, since otherwise drift would accumulate without limit.

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