c4aa4c14____Legal_Information_Institute_Flight_Profile_Distances_Meaning
[Distance] EK [Unit] Feet [Meaning] 
Approach Flight Path Distance. The distance from position E at which the helicopter establishes a constant angle on the approach flight path passing over station A and continuing to position K at which the position of the helicopter need no longer be recorded.
14 CFR Part 36, Appendix H to Part 36 - Noise Requirements For Helicopters Under Subpart H | US Law | LII / Legal Information Institute
Meaning