One which I couldn't identify once was on take-off in the 777...just prior to and after lift off there seemed to be a lot of vibration coming from the undercarriage...I thought that perhaps there was a rough patch on the runway at Gatwick...does anyone have any idea?
It happens on the 747 aswell, sometimes the undercarriage wheels are still moving and so are being slowed down fast before being stowed when gear is selected up.