"ICAO SARPs define the term 'Landing Distance' as "the horizontal distance traversed by the aeroplane by the aeroplane from a point on the approach path at a selected height above the landing surface to the point on the landing surface at which the aeroplane comes to a complete stop" (ICAO Annex 8 Part IIIA Paragraph 2.2.3.3. and Part IIIB Sub-part B Paragraph B2.7 e)")
"LDA is the length of runway which is declared available by the appropriate authority and suitable for the ground run of an aeroplane landing"
EU OPS 1.480
Typically that selected height is 50 ft. Performance tables calculated by Airbus or Boeing or others provide landing distance performance based on those 50 ft, because that is supposed to be your height above the threshold (after an ILS, a PAR, a VOR approach or a visual circuit). That is why I want to know how many meters are there available from the threshold. Cause I can't work out what my ground run will be in my airplane. My FCOM just doesn't give me that information, nor any FCOM or POH I know of (which are just a few, I admit).
As it happens, for landing there is no such thing as clearway, nor stopway. All of the landing distance available must be a suitable for ground run surface even if you will sistematically overfly a significant part of it. A runway is suitable for a ground run from the very threshold, even before in case of displaced threshold. The threshold, displaced or not, is the beginning of the LDA. In fact, the Threshold is
per se a declaration of the beginning of the LDA by the authority. It can be displaced forward, but not backwards. Airplanes don't touch down on the threshold, but still you need the runway to be suitable for ground run from the first inch of it. You can't flare before the runway threshold so you can "take credit" of as many meters before the aiming point (or shouldn't...).
I know that those values are based on tests made by test pilots who want to minimize landing distance as much as possible. That is why the FAA recommended adding a 15% to those values, if I recall correctly. But that is the best we have. I won't mind to use beyond glideslope distance if they give me landing roll distances, though
Jeppesen gives me the LDA in 10-9 in the airport plan view. If there is displaced threshold, LDA is given in the additional runway info, in 10-9 or in 10-9A. I have been looking at a few charts and what I-2021 said is correct: no displaced threshold, only beyond glide slope is given in the additonal rwy info. Displaced threshold, then you get the LDA.