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Which of the following instruments contains no gyroscope?

  • A.The turn coordinator
  • B.The slip and skid indicator
  • C.The attitude indicator
  • D.The directional gyro

Answer: B

Correct answer: The slip and skid indicator

The slip indicator is a ball in a curved liquid-filled tube. It has no rotor, no gimbals and no power supply - it settles along the resultant of gravity and centrifugal force by simple mechanics.

The other three all contain gyroscopes: a vertical-axis gyro in the attitude indicator, a horizontal-axis one in the directional gyro, and a canted rate gyro in the turn coordinator. The ball shares a case with the last of these, which is the source of the confusion.

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