It is FS9, and the wheel just visually sinks below the ground. However, I have found that to stop it appearing below the ground when starting a new flight, I need to start the flight in a different plane, and then change planes before taxiing anywhere. This has worked a few times at different airports. The landing is where the wheel normally sinks!! I do not land hard (normally about 200-300ft a minute (according the FSpassengers...)), but i did one flight into saudi arabia where the wheel did not sink. FS9 does not register a crash, however, the problem is annoying, as after landing, it is impossible to taxi anywhere, so unloading of the plane usually commences on the runway!!