CS ACNS.B.DLS.B1.020 Data Link Services

ED Decision 2013/031/R

(See AMC1 ACNS.B.DLS.B1.020 and GM1 ACNS.B.DLS.B1.020)

The data link system provides the following services:

(a) Data Link Initiation Capability (DLIC);

(b) ATC Communications Management (ACM);

(c) ATC Clearances and Information (ACL); and

(d) ATC Microphone Check (AMC).

AMC1 ACNS.B.DLS.B1.020 Data Link Services

ED Decision 2013/031/R

When the aircraft has no CPDLC Current Data Authority, the data link aircraft equipment should provide crew members entering an airspace of a data link equipped ATS unit with the capability to initiate a DLIC ‘Logon’ function (e.g. send a CMLogonRequest message) with the applicable ATS unit, in order to identify the aircraft and initiate the use of data link services.

GM1 ACNS.B.DLS.B1.020 Data link services

ED Decision 2022/008/R

Community Specification EN 303 214 ‘Data Link Services (DLS) System’ provides a set of test scenarios to be demonstrated using a verified ground data link system or a ground data link system simulator.

(a) Data link initiation capability (DLIC) service

The DLIC service enables the exchange of information between aircraft and ground data link equipment, necessary for the establishment of data link communications. It ensures:

(1) the unambiguous association of flight data from the aircraft with flight plan data used by an ATS unit,

(2) the exchange of the supported air–ground application type and version information,

(3) the delivery of the addressing information of the entity hosting the application.

(b) ATC Communications Management (ACM) Service

The ACM service provides automated assistance to flight crews for conducting the transfer of ATC communications (voice and data). It includes:

(1) the initial establishment of CPDLC with an ATS unit;

(2) the CPDLC ATC transfer instruction from one ATS unit to the next ATS unit;

(3) the CPDLC ATC instructions for a change in voice channel;

(4) the normal termination of CPDLC with an ATS unit.

(c) ATC Clearances and Information (ACL) Service

The ACL service provides flight crews with the ability to:

(1) send requests and reports to air traffic controllers;

(2) receive clearances, instructions and notifications issued by air traffic controllers to flight crews.

(d) ATC Microphone Check (AMC) Service

The AMC service provides CPDLC ATC instructions to flight crew(s) requesting him/them to verify the status of his/their voice communication equipment

[Issue: CS-ACNS/4]

CS ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

(See AMC1 ACNS.B.DLS.B1.025, AMC2 ACNS.B.DLS.B1.025, AMC3 ACNS.B.DLS.B1.025, GM1 ACNS.B.DLS.B1.025, GM2 ACNS.B.DLS.B1.025 and GM3 ACNS.B.DLS.B1.025)

A means is provided to protect the integrity of the message.

AMC1 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

The data link system should comply with the following applicable ATN Baseline 1 standards:

—      ICAO Document 9705 (Edition 2) for ICS (Sub-Volume V), ULCS (Sub-Volume IV), CM CPDLC (Sub-Volume II) ASE requirements;

—      EUROCAE Document ED-110B;

—      ICAO Document 9776 and ARINC 631-6 for VDL Mode 2 multi-frequency operations.

The data link aircraft equipment should provide support for the CPDLC application message integrity check mechanism , with support for ‘default checksum algorithm’ only.

AMC2 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

Testing demonstrations could be based in two main steps:

—      Equipment testing (done by equipment manufacturer) using adequate simulation testing tools.

—      System testing, at system test bench and/or at aircraft test level (either on ground or in flight).

Equipment qualification testing data may be reused from the avionics manufacturer, provided that full and unrestricted access to the compliance data is established and maintained. However, the applicant remains responsible for all test data used in the course of compliance demonstration.

AMC3 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

Where ARINC 631-6 identifies a specific deviation from ICAO Doc 9776 (Manual on VDL Mode 2), the provisions of the former should take precedence.

ARINC 631-6 also references ARINC 750 for definition of Signal Quality Parameter (SQP) levels. Measurements of SQP levels may be passed over the air-ground link as parameters in the XID exchanges.

GM1 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

EUROCAE Document ED-110B sections 3.3.5.1 and 3.3.6 mentions an ‘ATN Message Checksum Algorithm’ (or ‘Application Message Integrity Check (AMIC)’) that does not exist in ICAO Document 9705 Edition 2. These terms are correctly referenced in ICAO Doc 9705 PDR M60050001. 

GM2 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

Both ICAO Document 9705 and EUROCAE Document ED-110B include requirements for the support of FIS and ADS-C applications. These two applications are not mandated for operations in European airspace. Data link aircraft implementations are free to support these applications and should notify their application availability in the DLIC logon function.

GM3 ACNS.B.DLS.B1.025 Protection mechanism

ED Decision 2013/031/R

Further guidance material from EUROCONTROL is available on EUROCONTROL website (www.eurocontrol.int):

—      LINK2000+/ATC DATA LINK OPERATIONAL GUIDANCE, Version 6.0, Date: 17 December 2012.

—      LINK 2000+ Guidance to Airborne Implementers, Version 1.1, Date: 09 December 2009.

—      LINK2000+/FLIGHT CREW DATA LINK OPERATIONAL GUIDANCE Version 5.0, Date: 17 December 2012.

—      LINK2000+ Programme, Generic Interop Test Plan for Avionics - Part 1, Upper Layers and CM/CPDLC applications, Version 2.3, Date: 15th June 2010.