Referring to "22nm" downrange distance, the only place I have heard that number was in the C-5 where Lockheed only needed to produce the climb gradient charts to that distance. When Jepp OpsData did the computations for special OEI departures having 22nm data restricted them in some cases. They also expressed frustration at the limitations that distance caused. Especially in a plane where 22 nm might only have gotten you through flap retaction
Jepp considered 30 nm as the standard endpoint for climb gradient data.
GF