Appendix J – Comparison between EASA CS ACNS.D.ADSB and FAA AC 20-165A
Requirements
ED Decision 2013/031/R
|
CS
ACNS.D.ADSB Reference |
Comparison |
|
Applicability |
CS refers to Commission Regulation (EU) No 1207/2011, AC to FAA 14 CFR § 91.227. |
|
ADS-B Out System Installation |
CS addresses 1090 ES as the only ADS-B Out data link, AC UAT as well. |
|
ADS-B Out Data Parameters |
Parameters required by CS, optional for AC: GPS Antenna Offset. Parameters required by CS where available in suitable format, optional for AC: Vertical Rate and Selected Altitude. Parameters required by CS where available in suitable, not addressed by AC: Barometric Pressure Setting. Parameters not required by CS, required by AC: ADS-B In Capability. Parameters not addressed by CS, optional for AC: Selected Heading. All other parameters are required by both the CS and AC. |
|
Provision of Data |
No difference. |
|
ADS-B Transmit Unit Installation |
No difference. |
|
Antenna Diversity |
CS requires antenna diversity (as applicable to Commission Regulation (EU) No 1207/2011 aircraft). Within AC, single bottom-mounted antenna installations are allowed for ETSO-C166b classes A1S and B1S. |
|
Transmit Power |
No difference. |
|
Simultaneous Operation of ADS-B Transmit Units |
No difference. |
|
On-the-ground Status Determination |
No difference. |
|
Horizontal Position and Velocity Data Sources |
No difference overall. However, CS specifies ETSO-C129a as a minimum requirement (in line with Commission Regulation (EU) No 1207/2011). |
|
Other Data Sources |
No difference, as applicable to the common data parameters (see also ‘CS ACNS.D.ADSB.020’). |
|
Geometric Altitude |
No difference. |
|
Flight Deck Interface |
No difference. |
|
Integrity |
No difference, however, CS details requirements per data parameter. |
|
Continuity |
No requirement expressed in AC. |
|
Horizontal Position and Velocity Data Refresh Rate |
No difference. |
|
Horizontal Position and Velocity Total Latency |
CS uses time of applicability as a reference, AC time of measurement. In line with the AC recommendation that the difference between the two references should be less than or equal to 500ms, the total latency requirements are effectively the same (CS: 1.5s, AC 2.0s). |
|
Horizontal Position Uncompensated Latency |
No difference. |
|
Flight Test |
AC requires a flight test, for any set of component part numbers of the ADS-B Out system on a given aircraft type. |
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