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Annex 10, Volume V, Chapter 4 ,contain a general allotment of the frequency band 117.975 – 137 MHz. The main subdivisions of this band are the frequency bands allocated to both international and national services and frequency bands solely allocated to national services. Specific allotments to services are to be determined regionally. The figure below shows the special frequencies and allotments (Annex 10)
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Traffic advisory frequency
At smaller airports, landing sites or in airspace reserved for specific users (such as gliders) it is possible that a "traffic advisory frequency" is provided. This is used by the pilots flying in the area to announce their flying intentions, for the other pilots to be aware of their position and intended trajectory. In some States this is labelled as "Common traffic advisory frequency". In AIXM, this can be coded using a RadioCommunicationChannel associated with a AirTrafficControlService with type equal-to 'CTAF'. It is not necessary to associate it with a specific Unit, unless there actually exists an ATS Unit that provides some level of air traffic separation service using the same frequency.
Frequency in use for certain FL only
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| Identifier | Data Encoding Rule | Justification | Data Verification Rule (UID) | Remarks |
|---|---|---|---|---|
| RCC-201 | Each Each RadioCommunicationChannel shall have assigned frequencyTransmission value | AIXM 4.5 / Minimal data rule | AIXM-5.1_RULE-1A3376 | |
| RCC-101 | RadioCommunicationChannel.frequencyTransmission and RadioCommunicationChannel.frequencyReception shall be encoded in case of two-way radio communication is provided. | Data harmonisation | TBD | |
| RCC-102 | If a Service has more more than one frequency (radioCommunication), specify its usage (e.g. by rank or other purpose distinction such as flight levels). | Data consistency | TBD |
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