Assuming that the In-Flt Landing Distance is based on the new Operational Landing Distance (OLD) calculations, then these new distances will be greater than previous advisory ‘actual landing distances’.
Factored distances (FOLD), include a further 15% margin.
None of the increases should be viewed as additional safety margins. The calculation of OLD brings the performance more in line with what a pilot could achieve as an actual landing distance, and FOLD includes the generalised minimum addition to counter variability in operations, be this from flight technique (speed, ht, position), brake use, wind accuracy, or runway condition.
In many circumstances a further addition would reflect good airmanship.
I interpret
Blue’s procedure as requiring the fully factored dispatch RLD as the basis for normal in-flight assessment, and for abnormal landings the higher of RLD or the FOLD for the abnormality (which will probably be longer than the normal FOLD).
This appears to be a very sound and sensible policy for maintaining an acceptable low level of risk, in risk prone situations.
There is a brief explanation of the OLD concept in
Airbus OLD
Also
http://www.ukfsc.co.uk/files/Safety%...ust%202010.pdf
and
Safety First 12