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Speed
Security
2 Scope
This document applies to the use of datalink technologies and applications for 'low risk' ATM functions. (i.e. those which are not critical in terms of safety and / or time.) It is applicable to both Aeronautical Fixed Services and Aeronautical Radio Stations.
This document covers the use of private networks, such as those provided by ARINC and SITA.
The use of datalink technology for applications other than those detailed within this document will either be the subject of an amendment to this document or a new CAP670 requirement.
1.  The benefits listed here are only some of those which have been identified by EUROCONTROL ODIAC Task Force in the EATCHIP Transition Guidelines for Initial Air/Ground Data Communications Services, EUROCAE WG-45 Data Link Applications ED-78, ED-85, ED-89, ED-106, EUROCAE WG-53 / RTCA SC-189 Air Traffic Services ED-100 and ICAO Manual of Air Traffic Services Data Links Applications (Doc 9694).
Part 2 Safety Requirements
3  Safety Objective
To ensure that the level of safety of the ATM function is maintained or improved during installation, transition and operation of datalink equipment, applications and procedures (1003).
4  Requirements
4.1  A comprehensive safety assessment of the datalink application / system and its interfaces with existing ATC equipment, people and procedures shall be performed and submitted as part of the approvals process (371).
4.2  The Safety Assessment for a datalink application / system shall be provided by full and complete adherence to the ATS provider’s Safety Management System, if this exists (372).
4.3  Provided the Safety Assessment concludes that the datalink system / application is at least tolerably safe, then the use of private datalink networks, which may pre-date the ICAO SARPs, shall be permitted for the following categories1 of communications messages:
.  
Meteorological Communications

.  
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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