Its more that airbus didnt explain well in the FCOM the definitions between dispatch and inflight calculations. Those are notes from an old slide that I cant find.
RLD = 1.667xALD
ALD= 4,5 sec flare, assumes Vls at 50ft, no REV for dry or wet, MAX manual braking, Vapp at touch, Vls if athr off.
LD (in flight)= 7 sec flare, 96% Vapp at touch, credits as selected in flysmart
FLD (Factored LD)= LDx1.15
With inflight failures we go to the last 2. Without, we go to the dispatch.
What drove me crazy for long time was the takeoff performance in wet. Its calculated with 2 reversers in wet. Do a takeoff run in flysmart with runway limited numbers and zero margin. Lose an engine and your reverse is inop now. Well, you are out of the runway. (Play with reverse inop MEL item for the same takeoff)
Yes, I know, the 2 seconds at V1 speed but, that drove my OCD for long time! V1 is the speed where if you lose an engine you would have taken the desicion to stop within the remaining runway! LOL