A320 Airframe Vibration
Any folks out there found the cause of the occasional airframe vibration which seems to mainly affect "older" MSN's of the A320 family? It seems to present as a rapid vertical vibration and can be stopped by small changes in pitch, roll or yaw with A/P disconnected. Not a safety issue, just an aerodynamic irritation imho, but I would be interested in opinions from the Pprune FBW fraternity.