All aircraft operating above FL195 in the European region shall be equipped with radio equipment capable operating on a channel spacing of…
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Increasing congestion led to further subdivision of 25 kHz into 8.33 kHz channels in the ICAO European region => By reducing the channel spacing between consecutive frequencies in the VHF aeronautical communication band, 8.33 channel spacing adds two additional channels for every 25 kHz. This is to overcome the frequency congestion in the medium to long term by providing more channels.
Note: The mandatory 8.33 kHz frequency spacing at FL245 and above has been changed by ICAO and Eurocontrol to flight levels above FL195.
Learning Objective 090.06.01.01.05: State the frequency separation allocated between consecutive VHF frequencies.
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