Make the corrections on your landing weight according to the reference weight of 190T, ie if your landing weight is 230T then add the figure that it mentions in your QRH per 10T above 190T, in my case it's +170 per 10T so it would be +680 (170 x 4). If your landing weight is below 190T, just do the opposite. Regarding the overweight increment that has to do with your landing technique to be within the 360ft/min max ROD, therefore shallow flare and increased landing distance. If your max landing weight is 182T, and you land with 183T, you would take the reference distance for 190T (unless you are really willing to to abstract math for 7T less and find out something like 23m of decreased landing distance) and add the figure for overweight ldg proc (+650m). To summarise, anytime you land overweight, add the overweight ldg proc distance, regardless if you are above or below 190T, that is a reference weight, but 183T for you is already overweight.
Regarding the abnormals, for G+B the basic distance I get is 2430m for 190T. Now you need to add the difference for your weight which you stated to be almost the MTOW, so let's take 233T. The difference is 43T. That is +300m per 10T above 190T becomes 1250m. 2430+1250 = 3630m. It's a lot but you're landing 233T of airplane with 2 spoilers per wing and accumulator only...
ps in abnormal you don't have the overweight correction like in normal conditions. That is already taken care by the margins given in the abnormal computations.
Last edited by sonicbum; 22nd May 2014 at 08:46.
Reason: ps