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The erection system of an attitude indicator works by

  • A.Locking the gimbals when the aircraft is level
  • B.Adjusting the rotor speed
  • C.Aligning the gyro with the magnetic field
  • D.Applying small torques that precess the axis towards the vertical

Answer: D

Pendulous vanes or an equivalent sensor detect departure from vertical and apply a torque, which precesses the axis back. Because the sensor cannot distinguish gravity from acceleration, the same mechanism is the source of the instrument's turn and acceleration errors.

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