same as
but has a 15% factor added
#4.
Be very careful with such assumptions. The concept of OLD should provide a more realistic value of the minimum actual landing distance that pilots might achieve, and thus OLD may be greater than previous published actual distances (ALD).
It is very important to read the small print associated with the distances which should explain the assumptions made and the conditions relating to the data.
If the data is expressed as Factored Operational Landing Distance (FOLD) introduced by Airbus, this probably includes the minimum recommended factor of 15% safety margin. Again read the small print, understand the assumptions, and always assess the runway state carefully, being prepared to add a distance margin greater than the minimum or adjusting the braking level etc, etc.
See related item for Airbus and refs
http://www.pprune.org/tech-log/51386...ml#post7822808