O Documento ICAO 8168 estipula que, para uma abordagem de não precisão não CDFA, a aeronave não deve exceder o gradiente de 15% ao descer de FAF para MDA.
1.7.4 Stepdown descent The third technique involves an expeditious descent and is described as “descend immediately to not below the minimum stepdown fix altitude/height or MDA/H, as appropriate”. This technique is acceptable as long as the achieved descent gradient remains less than 15 per cent and the missed approach is initiated at or before the MAPt. Careful attention to altitude control is required with this technique due to the high rates of descent before reaching the MDA/H and, thereafter, because of the increased time of exposure to obstacles at the minimum descent altitude.