Can someone then please explain why it always sounds like someone is hitting the fuselage on the F/O side, low, when climbing through about 2500 feet??
It sounds like some-one knocking from the avionics bay, and I continue to look out to see if we still have the groundhandler hanging in his headset somewhere
Being on the receiving end of that particular noise, I'd sure like to know as well. It almost harkens back to an earlier type that had no gear uplocks, and would occasionally hit the landing gear with a shot of hydraulic pressure if it started to sag in the well. Doing some FCOM research, I see that hydraulic pressure is removed from the gear above 260 kts. That could potentially generate a "clunk." This being an Airbus, these things usually occur over more of a range than at a specific point. Just a possibility.