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Version Number, SIL and NACP in aircraft operational status message, if the avionics equipment is RTCA/DO-260A compliant.
11 April 2007
AC 21-45(0): Airworthiness Approval of Airborne Automatic Dependent Surveillance Broadcast Equipment
8.2.4 To provide a more comprehensive data set to other stations, transmission of the following data is highly desirable, as it is used by the Australian ATC system:
.
SPI Indication (in Surveillance Status Subfield of ADS-B airborne position messages);
.
Emergency Flag (in Surveillance Status Subfield of ADS-B airborne position messages);
.
Emergency Priority Status Information (may be broadcast in Extended Squitter Aircraft Status Message, RTCA/DO-260 or RTCA/DO-260A, or the Target State and Status Message RTCA/DO-260A);
.
Velocity Information (Extended Squitter Velocity Message or Surface Position Message);
.
GNSS height (GNSS Altitude Difference From Barometric Altitude in Extended Squitter Velocity Message); and
.
Vertical rate (in Extended Squitter Velocity Message).
Note: Transmission of SSR ATC 4 digit octal Mode A code in ADS-B messages is not required. It may however, be transmitted in “Test messages” in accordance with RTCA/DO-260A.
8.2.5 Additional ADS-B data, defined in ICAO Annex 10, Amendment 77 or RTCA/DO-260 or RTCA/DO-260A, may also be transmitted.
8.2.6 Equipment marked as compliant with ATSO-C1004, ATSO-C1005, TSO-C166, or TSO C166a, are considered capable of transmitting data described above in the correct formats.
8.2.7 Transponders marked as compliant with the following standards:
.
AEEC – ARINC 718A;
.
TSO C112;
.
ED73B;
.
JTSO-2C112a; or
. ETSO-2C112a
may be capable of transmitting this information in the correct formats. Functional testing of the installation would be required to confirm compliance.
8.2.8 ADS-B transmitters should also be compliant with the following :
.
For transmitters that also operate as ATC transponders:
-ATSO-C1004 (Type G1 only);
-ATSO-1C74c;
-TSO-C112 and compliant with RTCA/DO-181C; or
-EUROCAE ED73B or RTCA/DO-181C.
.
Non-transponder ADS-B transmitters:
-ATSO-C1005.
11 April 2007
8.2.9 RTCA/DO-260 compliant ADS-B transmitters use the Horizontal Protection Limit/Horizontal Integrity Limit (HPL/HIL) data from the GNSS receiver as the highest priority data source for determination of Navigation Uncertainty Category (NUC).
For RTCA/DO-260 compliant transmitters, ADS-B transmitters may use the Horizontal Figure of Merit (HFOM) data from the GNSS receiver during periods of HPL non-availability due to operational reasons (e.g. satellite geometry, etc).
For RTCA/DO-260A compliant transmitters, HPL is used for determination of Navigation Integrity Category (NIC) and HFOM is used for determination of Navigation Accuracy Category (NAC).
8.2.10 It is desirable that the flight crew are able to disable the ADS-B function on instruction from ATC without disabling the operation of the ATC transponder function.
8.2.11 Transmitter antenna installation needs to comply with guidance for installation of ATC transponders to ensure satisfactory functioning.
8.3 ADS-B data sources (Mandatory)
8.3.1 The following section describes the minimum data necessary for ADS-B transmitters to function in the ATC environment (for more detailed requirements including references see Appendix B to this AC). Each category is essential to ensure the message being transmitted has all the relevant data necessary to enable separation to be calculated. Failure to comply may render the prospective operator unable to obtain the benefits of ADS-B separation.
8.4 Positional data
8.4.1 Accurate positional data is essential for the ADS-B system to operate in a “radar like manner” and be the basis for the allocation of separation between aircraft. Valid GNSS data input provides an acceptable accuracy and integrity for separation purposes with the delivery of position information at a periodic interval of less than or equal to 1 second.
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