Airliner gear thump?

Update: If you're in an airliner and you're seated in the region of the main gear you can sometimes hear it retract on take off, especially in smaller planes. Is the thump the gear itself coming a rest, is it the locking mechanism taking hold, or is it the wheel well doors shutting? On landing when the gear extends... show more If you're in an airliner and you're seated in the region of the main gear you can sometimes hear it retract on take off, especially in smaller planes. Is the thump the gear itself coming a rest, is it the locking mechanism taking hold, or is it the wheel well doors shutting? On landing when the gear extends you can sometimes hear the added wind noise. Does that noise start as soon as the wheel well doors open or is it when the gear itself drops into the airstream? Thanks much!!
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