AAsergeantKK

Has anyone else experienced a loud turbine noise while taxiing the aircraft at speeds above 5 knots? It sounds as if the cockpit window is open, and you can hear the surroundings of the airport along with turbine noises. Additionally, while taxiing, there is a loud knocking sound every 3 seconds. This noise doesn't seem related to the nose gear but rather resembles someone knocking on the cockpit door." Would you like any adjustments to this?