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]
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