I have been using the MD-11 in FS9 since it was released on a regular basis and the FMC always tells me that the MLW is 458,000 pounds where the manual states the MLW is 491,500 pounds. I have upgraded my computer twice since the MD-11's FS9 release, this includes a full reinstall of everything. I have attached a screenshot, I always start off with a cold and dark cockpit but I took the screen shots with the engines running to save time.This happens with both the passenger and freighter models.

Daniel, I found this on wikipedia...You can see the various landing weights for the different variants...I would need to check, but I remember seeing two different values for max LW dependent on whether I was in the -F or -C (the passenger version is the combi it would seem, as you can add freight...)Andrew

I didn't think that they modeled that version, only the passenger and freighter. This screen was taken from the Aeromexico GE passenger.