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The pendulous vane uses precession to correct a gyro by small jet air, but I do not know how it works. As far as I study, when gyro is tiled, one of the doors open and the other one is closed. This principle seems to be hard for me to understand. Could you let me know the principle of pendulous vane, and how it corrects a gyro's error?

Mun Park
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    Nice diagram here: https://aviation.stackexchange.com/questions/16376/how-are-attitude-indicators-kept-accurate/16417#16417 – BowlOfRed Dec 11 '18 at 21:13
  • There's an excellent explanation of them here if you can ignore the writer's delusional conspiracy ideas in the last paragraph – TomMcW Dec 12 '18 at 02:08

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