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Which errors are air-driven attitude indicators with pendulous vanes susceptible to?
  • A
    Pitch and slip error.
  • B
    Slip and yaw error.
  • C
    Slid and skip error.
  • D
    Pitch and roll error.

Refer to figures.
Air-driven attitude indicators, which are also referred to as artificial horizons, use a gyroscopic system powered by the force of airflow. This system remains fixed in space as the aircraft moves, providing the pilot with a visual reference of the aircraft's attitude relative to the horizon.

These instruments are susceptible to errors: acceleration and turning errors.

Acceleration errors (pitch error due to ecceleration) occur when the aircraft speeds up or slows down in a straight line, making the horizon appear to tilt in the opposite direction of the aircraft's pitch attitude.

Turning errors occur when the aircraft turns, causing the horizon to appear to tilt in the direction of the turn.

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