Discussion
Consider the following instrument and gyro axis pairs:
Attitude indicator - Spin axis vertical
Directional gyro - Spin axis horizontal
Turn indicator - Spin axis horizontal and lateral
Slip indicator - Spin axis vertical
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
The first three are correct: the attitude indicator's spin axis is vertical, the directional gyro's is horizontal, and the turn indicator's is horizontal and lateral.
The fourth is wrong on a more basic point. The slip indicator has no gyro at all - it is a ball in a curved liquid-filled tube, responding to the resultant of gravity and centrifugal force. It shares a case with the turn indicator, which is why it is often assumed to share its mechanism.
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