Hi. I think in the latest 2 beta builds i get this sounds while clicking on some options of the FMC or when pressing keys from the NUM pad that I have assigned to some views. This only happens on ground. When airborne, it doesnt happen. Just in cockpit. I have no other functions assigned to those NUM keys on the cockpit. Al also get this when switching from external to cockpit views, using the key from assigned to it. Again, there is no other function assigned to them and only happens when on ground. It is very annoying. This only happens when using the option REALISTIC for Parking brakes simulation from PMDG Setup, Options, Simulation. When using SIMPLE problem described doesn’t occurr. Hope it gets fixed during the next beta builds or next pmdg updates? Thanks!