Threegreens,
You need to be able to land within 60% of the runway. There are two ways to get to this number.
1. Get the runway length, take 60% percent of that and compare with AFM landing distance.
2 get AFM landing distance and multiply by 1.67 to get minimum runway length.
Example: runway is 10.000 max AFM landing distance is 6.000. On the other hand if you check the AFM and calculate that landing distance is 6000,multiply that by 1.67 and you get 10.000
Same calculation just from different sides. To calculate what 60% is multiply by .6 if you have a landing distance that is 60% multiply by 1.67 to find out what 100% is!!
1 divided by .6=1.67
Multiplying runway length by .6 will give you max landing distance, multiplying AFM Landing distance by 1,67 will give you minimum runway length