When I put the gyroscope on this vehicle for the first time, it started to make thruster sound. It doesn't contain any thrusters.
The only mod is Azimuth Open Cockpit but probably it can be reproduced without it.
I also found something similar in MP (probably happens in SP too), atmos thrusters are silent if the grid has no gyro.
Video of the issue: https://streamable.com/7cmko
Actually those sounds are not sound of thrusters, but sounds of ship. For some unknown reason grid without gyro is considered "debris" and will play no sounds (for some reason condition is (("no thrusters" && "no wheels") || "no gyro" -> debris) ).
As it seems, those sounds you probably hear are not sounds of thrusters but 'motor and systems starting'. Those sounds should probably be heard when grid gets powered, but due to gyro being 'essential' it was heard once gyro was placed.
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