However, at a given power setting, reverse thrust tends to generate significantly more noise than forward thrust and an increment ΔL shall be applied to the NPD-derived event level, increasing from zero to a value ΔLrev (5 dB is recommended provisionally [18]) along 0,1 · sstop and then falling linearly to zero along the remainder of the stop distance.
p/po, le rapport entre la pression atmosphérique ambiante à l'altitude du point d'observation et la pression atmosphérique standard au niveau moyen de la mer: po = 101,325 kPa (ou 1013,25 mb)