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Aircraft stations in the aeronautical mobile (OR) service operating in the frequency band 22-22.2 GHz are subject to agreement obtained under No. 9.21 with respect to the fixed service and shall not cause harmful interference to, nor claim protection from, the fixed service. The following power flux-density values shall be used as a threshold for coordination under No. 9.21:
−110 dB(W/(m² · MHz))
for
0° ≤ θ ≤ 12.6°
2.86 θ − 146 dB(W/(m² · MHz))
for
12.6° < θ ≤ 15°
0.87 θ − 116 dB(W/(m² · MHz))
for
15° < θ ≤ 30°
0.067 θ − 92 dB(W/(m² · MHz))
for
30° < θ ≤ 90°
where θ is the angle of arrival of the incident wave above the horizontal plane, in degrees. This criterion should be applied at the border of the territory of another administration for any aircraft station located at an altitude of up to 15 km above the ground. In conducting the calculations, the most recent version of Recommendation ITU-R P.525 should be used. (WRC-23)