Battery/Gyro sound
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It can take 15 minutes for the gyro's to completely spool down and stop spinning.
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I was quite surprised when several beta testers and previewers expressed the same concern. Apparently correctly simulated gyroscopes are more rare in flight simulator than I thought. I often return to my aircraft after more than 30 minutes away and can still hear the gyroscopes spinning. Some purists recommend not pushing/pulling your aircraft on the ground while the gyros are still spinning, which I can't imagine!