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CodeFacilityRankingTypeRule
PRIMARYUse for main/normal frequency 
SECONDARY

Use 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  

frequency

Info
titleAIXM 5.2 Improvements

A change proposal (AIXM-542) for the next AIXM 5.2 version has been approved by the AIXM Change Control Board, which deletes 'SECONDARY' from CodeFacilityRankingType list of values utilised by RadioCommunicationChannel.rank and Service.rank (and its subclasses)

The coding guidelines provided here are aligned with forward/backward conversion rules contained in the AIXM-542 Change Proposal.

  

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
Note
titleNote
Note: Not clear what is the difference between Secondary and Alternate. Has to be raised to AIXM CCB

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)

:

Info
titleEuropean Regional procedure

Note that in the European Region, EUR Doc 011, EUR FREQUENCY MANAGEMENT MANUAL extends the range of frequencies reserved for data link, starting from 136.500 MHz.


Traffic advisory frequency

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