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AIXM Model Overview

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The rank attribute should be coded in accordance with the usage not with local terminology. For the usage of the values provided for the rank attribute the following rules should be taking into account:

CodeFacilityRankingTypeRule
PRIMARYUse for main/normal frequency 
SECONDARYUse for secondary frequency and also if other terms (stand-by freq, back-up freq, alternate freq) are used in the sense of a secondary frequency  
EMERG

Use for emergency frequency, e.g. 121.500 MHZ (Aeronautical emergency frequency), 123.100 MHZ (Auxiliary frequency (SAR))

GUARDUse if used in the sense of "listening only" frequency, except for emergency frequencies
ALTERNATE
OPEN QUESTION: Not clear what is the difference between Secondary and Alternate.

Use for other than specified purpose (e.g. available on request only).


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):

Frequency in use for certain FL only

In AIXM a frequency cannot directly be assigned to an Airspace.  The frequency is related to a Service. The Service then is provided within one or more client Airspace. If a Frequency of a Service is in use for certain FL(s) only, this has to be coded as a Note to the corresponding RadioCommunicationChannel feature. See also topic ATS Unit providing Service.

Coding Rules for Radio Communication Channel

IdentifierData Encoding RuleJustificationData Verification Rule (UID)Remarks
RCC-201

 Each RadioCommunicationChannel shall have assigned frequencyTransmission value

AIXM 4.5 / Minimal data ruleAIXM-5.1_RULE-1A3376
RCC-101RadioCommunicationChannel.frequencyTransmission and RadioCommunicationChannel.frequencyReception shall be encoded in case of two-way radio communication is provided.Data harmonisationTBD
RCC-102If 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 consistencyTBD

Coding Examples

See topics ATS Unit providing Service, Controlling Unit for Route Segment, and Controlling Unit for En-route Holding.

References

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