Discussion
Statement I: The turn coordinator responds to roll rate as a turn is entered.
Statement II: Its gimbal axis is canted rather than horizontal.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. The turn coordinator's gimbal axis is canted upwards, typically by about 30 degrees, so the gyro senses a component of roll rate as well as yaw rate.
The instrument therefore indicates as soon as the aircraft banks, before any appreciable turn has developed, which gives the pilot an earlier cue. A turn indicator with a horizontal gimbal responds to yaw rate alone and does not move until the turn begins.
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