My two cents,
I think the number that counts is the one obtained when calculating the landing distance during flight, so the 54,5t is OK.
The same thing applies if you were to find less than optimum conditions at your destination, something like a wet runway with medium brake action and a 10kt tailwind then your MLW of 54t calculated at dispatch goes out the window.
I don't fly anywhere near the EU but at my workplace what matters is the number you come up with during flight with the current weather, runway conditions and actual landing weight.
Also dispatch at our airline does all calculations with a dry runway.
Last edited by AVApilot; 20th June 2013 at 22:42.