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AMC1 ACNS.D.ADSB.025(a) Provision of data -- Approved sources

Available versions for ERULES-1963177438-15905

ED Decision 2013/031/R found in: GM Remote Aerodrome Air Traffic Services (ED 2019/004/R) Issue 2 (Jul 2020)

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AMC1 ACNS.D.ADSB.025(a) Provision of data — Approved sources

ED Decision 2013/031/R

(a) See [AMC1 ACNS.D.ADSB.070](#_DxCrossRefBm573002757)-090 for details on the approval of the respective data sources.

(b) For transmission of optional data items, the following provisions should be considered:

(1) Airspeed

In case of a loss of GNSS horizontal velocity data, the ADS-B transmit unit normally switches to broadcast airspeed information (using subtypes 3 and 4 of register 0916).

Therefore, if airspeed data is provided to the ADS-B transmit unit, it should be provided by an approved airspeed source that is providing data intended for use by the flight crew. An air data computer meeting the minimum performance requirements of holding an EASA equipment authorisation in accordance with ETSO-C106 (JTSO-C106) is an acceptable source.

(2) Heading

In case of a loss GNSS ground track and if heading is provided to the ADS-B transmit unit, the heading source should hold an EASA equipment authorisation in accordance with ETSO-C5e (JTSO-C5e) or any revision of ETSO-C6d (JTSO-C6d).

(3) Other Data Parameters

The Intent Change Flag should be set as appropriate to indicate the availability of information in the Mode S registers 4016 to 4216.

If available, Selected Heading information should come from approved data sources.

The 1090 ES IN capability field should be set correctly.