On a few aircraft, I hear a terrible scraping sound .... Like a wheels-up landing (never done one, but that's the best way I can decribe it).
It happens with certain aircraft only, but with those, it happens all the time on all surfaces (tarmac or carrier deck). I haven't done a complete inventory of which are affected - so far, I've found it on Rob Richardson's Vampire, Flying Stations' Sea Fury, to name a few. In the case of the Sea Fury, it does it with either the stock sounds or Nigel's soundest.
I want to say maybe Falcon409 may have raised this before - searched, but can't find the thread.
Sim is FSX Acell.