c4aa4c14____Legal_Information_Institute_Flight_Profile_Distances_Meaning
[Distance] CI [Unit] Feet [Meaning] 
Takeoff Flight Path Distance. The distance from position C at which the helicopter establishes a constant climb angle on the takeoff flight path passing over station A and continuing to position I 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