A few small points;
Hi! The figures are correct just remember that those rules for the preflight desision. once you airborne they can not be apply.
The requirements apply in both the case of flight planning before the flight departs and they also apply to any re-planning enroute. OPS 1.475 Refers.
If it is an emergency then you can perhaps choose between landing on a 12,000ft runway 100nm away or in a big muddy field 1nm away. That is a command decision in the circumstances and depends on many factors - 1 out on a 3 engine aircraft then the 100nm trip is probably a no brainer as may be the muddy field with a fire in the cockpit which one can not extinguish.
However, one would have to later justify one's actions or expect that an investigations would later find the actions reasonable in the circumstances.
Therefore I would suggest that unless one can justify a possible over-run I would not push the limits and try landing on a runway that merely matched the actual landing distance figures in the AFM.
But,!!!!
EU-OPS requires that (jet example) the operator ensures the aircraft can land on a dry runway from 50ft within 60% of the LDA. OPS 1.515
If you do not believe that it is possible to land in the figures published in the AFM then one can not use those figures to ensure compliance with the 60% requirement.
Example;
Aircraft A has a published LDA of 5000ft in the expected conditions are the destination.
Most people seem happy to say two things;
1. I need a runway of 5000 * 1.67 = 8350ft or more
and laso say
2. Don't expect to be able to match the book figures.
If we are to believe 2. above then we have to ask "What extra do you add above the book figure" that you know on a good day you can match?
If the response is "I would add 20%" then in order to comply with EU OPS the following would apply;
Book Figure = 5000ft
Operator figure = 5000 * 1.2 = 6000ft
Now the aircraft needs 6000 * 1.67 = 10020 ft of runway available before that operator can honestly say that they have ensured the aircraft can land within 60% of the runway available.
Remember that the requirements are not that the book figures show it can be done but that the operator
ensure it can be done.
There is quite a difference in runway requirements when the operator uses fingures that it knows can be acheived rather than AFM figures that everyone says can not be acheived in normal operations.................or can they?