AMC1 ACNS.D.ADSB.020(a-b) ADS-B Out data parameters
ED Decision 2013/031/R
During ADS-B Out system installation testing, all the parameters that are broadcast should be demonstrated to be correct for each installed ADS-B transmit unit, i.e. the transmitted data should be in line with the respective source data.
The Emitter Category, Aircraft Length and Width and GPS Antenna Offset parameters might be either configured as a fixed value during ADS-B Out system installation, or provided via a variable data interface. In both cases, during installation, the respective settings should be verified to be correctly set.
The ADS-B Horizontal Position System
Design Assurance (SDA) parameter indicates the probability of an ADS-B Out
system malfunction causing false or misleading position information or
position quality metrics to be transmitted. SDA may be pre-set at installation
for systems that do not utilise multiple position sources with different
design assurance levels, otherwise the system should be capable of adjusting
the SDA broadcast parameter to match the position source being employed at the
time of transmission.
ADS-B transmit equipment that is compliant with AMC1 ACNS.D.ADSB.030 and that is directly
connected to a position source compliant with AMC1 ACNS.D.ADSB.070 may set the
SDA to ‘two’ without further analysis. For more complex ADS-B installations, a
system safety assessment is required to set the SDA. Basically, the lowest
design assurance level of one system in the horizontal position data
transmission chain should define the SDA value.
Additional guidance material on the required surveillance data parameters are provided in Appendix H Part 1 and Part 2.
Appendix H Part 6 provides matrices of the so-called BDS register fields as used by the 1090 ES ADS-B transmit unit to broadcast the ADS-B Out parameters. These matrices detail the ADS-B Out data requirements at data field level for general understanding and in support of integration testing, as appropriate.
If installations transmit ADS-B Out data that do not meet some requirements of the Subpart D Section 4, the respective data should only be transmitted with a ‘zero’ quality indication (if a quality indication is defined in the ADS-B Out transmit system).
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