I am teaching aviation students theory for the ATPL Exam. And one of the subjects, instrumentation, there is question on the exam that has stumped me.
It claims that the torque motor that will drive the outer gimbal to the correct heading if it gets an error signal, is also used as the system that will erect the gyro and keep it from toppling?
But in all, but limited, information I can find, we are talking about a precession motor. That does the primary job, correcting the error.
Which begs the question: Are there two motors? A precession motor and a torque motor that is activated with a mercury tilt switch if the gyroscope starts to topple?