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Turn Indicators and Yaw Rate - Question N992836

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  • Turn Indicators and Yaw Rate - Question N992836


    "Under normal conditions, when an aircraft is in a banked turn, the rate-of-turn indicator is a valuable gyroscopic flight control instrument; when it is associated with an attitude indicator it indicates:

    1. The angular velocity of the aircraft about the yaw axis
    2. The bank of the aircraft
    3. The direction of turn of the aircraft
    4. The angular velocity of the aircraft about the real vertical"

    Apparently the correct answer is 1, 3. However, a rate of turn indicator is supposed to indicate rate-of-change-of-heading about the true (earth's) vertical, which would give 1,4. The only circumstance that I can think of giving 1,3 as the correct answer would be if the turn indicator had its rotor axis parallel to the lateral axis *even in a turn*, which would then allow it to measure rate of yaw about the aircraft's yaw axis (and not rate-of-change-of-heading). This is not the case since the springs are designed to keep the rotor axis parallel to the true horizontal, and thus make the instrument sensitive to rate-of-change-of-heading.

    A claraification would be much appreciated. Many thanks.
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