no obstacle’s penetrating the 152 feet per nm obstacle slope
Asked by: CFI 1706 views Instrument Rating
When FAA evaluates an airport for the need to have an obstacle departure procedure based on terrain, i understand that if there is no obstacle's penetrating the 152 feet per nm obstacle slope, then FAA will not designate a departure procedure. How far out in terms of miles away does FAA evaluate the terraine for this obstacle slope? Do they evaluate out to 10 miles, 30 miles, 50 miles? The reason for this question is if i do not see any published departure procedure for an airport, do i assume that there is no obstacle's penetrating this 152 fpnm obstacle slope gradient infinately? It seems to be a bad assumption but i'm not sure.
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