CS ACNS.D.ADSB.090 Flight deck interface

ED Decision 2013/031/R

(See AMC1 ACNS.D.ADSB.090(a) and AMC1 ACNS.D.ADSB.090(b))

(a) The control and display of surveillance data items is as per CS ACNS.D.ELS.030.

(b) A means is provided to indicate the non-operational status or failure of the ADS-B Out system without undue delay.

AMC1 ACNS.D.ADSB.090(a) Flight deck interface

ED Decision 2022/008/R

(a) Installations

(1) Data transmission and display consistency

 The data transmitted by the active ADS-B transmit unit should be consistent with the data displayed to the flight crew.

Consistency may be demonstrated by using a compliant GNSS sensor connected to the transponder and the navigation equipment (i.e. the transponder and navigation equipment receive the same data from the GNSS source).

Where this is not practical, compliance may be demonstrated by installing a stand-alone GNSS receiver connected (only) to the transponder, provided that the GNSS receiver is approved in accordance with ETSO-C145c or ETSO-C146c (or later amendments).

Note 1: Operational Classes 1, 2 or 3 of RTCA DO-229D satisfy the ‘consistency’ criteria.

 Note 2: The horizontal position data displayed to the flight crew may be based on data from more position sources than the one used for ADS-B transmissions.

(2) Single point of flight crew entry

 Installations that do not provide a single point of flight crew entry for the transponder and the ADS-B transmit unit should be evaluated to ensure that dual entry of the Mode A code, SPI, and emergency status does not lead to the transmission by the active ADS-B transmit unit of inconsistent data, particularly when communicating an aircraft emergency.

(b) ADS-B off switch

If control is provided to enable or disable the ADS-B transmit unit, then the status of the active ADS-B transmit unit should clearly be indicated to the flight crew from their normal seated position.

The respective controls should be located such that inadvertent disabling is prevented.

[Issue: CS-ACNS/4]

AMC1 ACNS.D.ADSB.090(b) Flight Deck Interface

ED Decision 2013/031/R

ADS-B   device or function failures, should be indicated in amber or in accordance with the flight deck annunciation philosophy, without undue delay, i.e. a response time within the order of one second.

ADS-B device or function failures may be indicated independently of each other; however, detailed operating instructions should be developed to describe the means to interpret indications.

The ADS-B device or function failure indication should not be confused with an ACAS or Mode S system failure annunciations.

In case of an ADS-B function failure, it is expected that the transponder should continue to support the ACAS, Mode A/C and Mode S functions.

The proper indications of the ADS-B Out system failures should be tested.