Discussion
Which of the following is not an error of the attitude indicator?
Lock-in at low rotation rates
Acceleration error during take-off
Turn error in a prolonged turn
Drift from bearing friction
Answer: D
Correct answer: Lock-in at low rotation rates
Lock-in belongs to the ring laser gyro, where the two counter-rotating beams couple together and cease to show a frequency difference below a threshold rate - which is why such gyros are mechanically dithered.
The other three are genuine attitude indicator errors: acceleration error and turn error from the pendulous erection system responding to the resultant of gravity and acceleration, and slow drift from bearing friction. A mechanical gyro has no beams to lock.
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