.
Flight Regularity Communications
.
Aeronautical Information Service Messages
.
Network/Systems Administration (374)
4.4 Communications in categories assigned a higher priority than those listed above may be permitted if the ATS provider supplies SRG with evidence, in addition to the Safety Assessment, proving that:
. The application is not time critical
and
. Procedures exist for ensuring that the failure of datalink systems has no long term, short term, or immediate effect on the ability of the aircraft or ATSU to complete the communication at an appropriate time (375).
NOTE: The message categories are referenced in the ICAO Manual of Air Traffic Services Data Links Applications (DOC 9694) and the ICAO Manual of Technical Provisions for the Aeronautical Telecommunications Network (ATN) (DOC 9705).
1. These message categories are referenced in the ICAO Manual of Air Traffic Services Data Links Applications (Doc 9694) and the ICAO Manual of Technical Provisions for the Aeronautical Telecommunications Network (ATN) (Doc 9705)
COM 04 Appendix - Acceptable Means of Compliance
1 Operational Requirements
The datalink application / system should be demonstrably compliant with its Operational Requirement (OR), produced by the ATS Provider (1157). This OR should form the basis for the collection of evidence that the stable implementation of the application / system is suitable for operational service (1158).
The OR should include performance and safety requirements pertinent to the application / system concerned (1159).
The OR should specifically reference any security needs pertinent to the application / system concerned (1160).
2 Compatibility
Any datalink system supporting existing functionality should be backwards compatible with any existing ATC methods, procedures and equipment which currently provides all or part of the service for which it is designed (1161).
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