Discussion
Which of the following is not a reason for driving gyros electrically rather than by vacuum?
Electric gyros are immune to precession
Vacuum systems weaken at altitude
Split drive gives redundancy against a single failure
Vacuum pump failure is gradual and hard to detect
Answer: A
Correct answer: Electric gyros are immune to precession
Precession is a property of any gyroscope, whatever drives it. An electric gyro obeys \( \Omega = T/I\omega \) exactly as an air-driven one does.
The other three are genuine reasons: vacuum systems weaken with altitude as the air thins, splitting the drive between vacuum and electrical power means one failure cannot remove every attitude reference, and a pump failing gradually degrades the indication while it still looks plausible - the most dangerous kind of failure.
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