Appendix 4 to AMC 20-24

• ED Decision 2008/004/R found in: AMC-20 Amdt 21 - Airworthiness of Products, Parts and Appliances (Apr 2021)

Appendix 4 to AMC 20-24 ED Decision 2008/004/R Appendix 4.1: Summary of ADS-B-NRA Air-to-ground Interoperability Requirements The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126:[[42]](#_ftn42) <table border="1" cellpadding="0" cellspacing="0" width="606"> <thead> <tr> <td colspan="2" rowspan="2" width="153"> <p><b>Parameter</b></p> </td> <td rowspan="2" width="66"> <p><b>BDS register </b></p> </td> <td colspan="2" width="296"> <p><b>Version 0</b></p> </td> <td width="91"> <p><b>Version 1</b></p> </td> </tr> <tr> <td width="189"> <p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p> </td> <td width="106"> <p><b>DO-260/ED102</b></p> </td> <td width="91"> <p><b>DO-260A</b></p> </td> </tr> </thead> <tr> <td colspan="2" valign="top" width="153"> <p>Aircraft identification </p> </td> <td valign="top" width="66"> <p>0.8 </p> </td> <td valign="top" width="189"> <p>§2.3.4 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.5 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.5</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>SPI<a href="#_ftn43">[43]</a></p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.6 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.2 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.2</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Emergency indicator </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.6 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.2 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.2</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Barometric altitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.4 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.4 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.4</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (NUC/NIC) </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.1 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.1 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.1</p> </td> </tr> <tr> <td rowspan="2" valign="top" width="77"> <p>Airborne Position</p> </td> <td valign="top" width="76"> <p>Latitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.3 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.7 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.7 </p> </td> </tr> <tr> <td valign="top" width="76"> <p>Longitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.3 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.8 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.8 </p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Emergency status<a href="#_ftn44">[44]</a><a href="#_ftn45">[45]</a></p> </td> <td valign="top" width="66"> <p>6.1 </p> </td> <td valign="top" width="189"> <p>Table 2-97 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.7.9 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.7.8 </p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (NACp) </p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.7.2.7</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (SIL) </p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.1.1</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Version Indicator<a href="#_ftn46">[46]</a></p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§A.1.4.10.5 </p> </td> </tr> </table> Table 5: Mandatory ADS-B-NRA Parameters The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126: <table border="1" cellpadding="0" cellspacing="0" width="607"> <thead> <tr> <td rowspan="2" width="153"> <p><b>Parameter</b></p> </td> <td rowspan="2" width="66"> <p><b>BDS</b></p> <p><b>register</b></p> </td> <td colspan="2" width="296"> <p><b>Version 0</b></p> </td> <td width="91"> <p><b>Version 1</b></p> </td> </tr> <tr> <td width="189"> <p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p> </td> <td width="106"> <p><b>DO-260/ED102</b></p> </td> <td width="91"> <p><b>DO-260A</b></p> </td> </tr> </thead> <tr> <td valign="top" width="153"> <p>Airborne Ground Velocity</p> </td> <td valign="top" width="66"> <p>0.9 </p> </td> <td valign="top" width="189"> <p>§2.3.5 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.6 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.6 </p> </td> </tr> </table> Table 6: Optional ADS-B-NRA Parameters Appendix 4.2: Guidance on Encoding of Positional Quality Indicators In order to be able to check the compliance of the actually transmitted ADS-B data with the required quality on the recipient side, ADS-B message transmissions contain “Quality Indicators”. These are expressed for ED-102/DO-260 and DO-260A compliant ADS-B transmit systems as follows: — ED-102/DO-260: Navigation Uncertainty Category (NUC), a combined expression of (accuracy and) integrity requirements through a single parameter; — DO-260A: Navigation Accuracy Category (NACp) to express the position accuracy (as a 95 percentile), Navigation Integrity Category (NIC) to express the integrity containment radius and Surveillance Integrity Level (SIL) to specify the probability of the true position lying outside that containment radius without alerting. Minimum acceptable NUC and NIC/NACp values in support of 5 NM ADS-B-NRA separation services, based on the requirements summarised in Table 2 of Appendix 4, are as follows in line with the “NIC/NACp to NUC” conversion table below. NUC values (encoding based on HPL, with the accuracy requirements met by GNSS systems by design and in line with the related NACp values in below conversion table): — 5 NM separation: NUC = 4; The corresponding NIC/NACp values are as follows. — 5 NM separation: NIC = 4, NACp = 5, The SIL value is established to SIL≥2 in line with the combination of the position source failure and position integrity alert failure requirements, as summarised in Table 2 of Appendix 4. Note 1: In case the SIL value is not output by the position data sources, it is recommended that the ADS-B transmit system provides for the static setting of SIL as part of the installation procedure and as demonstrated for the applicable position data source configuration. Note 2: ED-126 provides, based on its reference collision risk analysis only, arguments for an equally appropriate encoding of a SIL=2 as a matter of expressing the system integrity as well. As for the presentation of the values presented in this document, it is at the discretion of the ATSP to decide upon the appropriate threshold values required in support of the separation services in its airspace. <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td colspan="2" valign="top" width="202"> <p><b>NUC (max Rc NM) </b></p> </td> <td colspan="2" valign="top" width="203"> <p><b>NIC (max Rc NM) </b></p> </td> <td colspan="2" valign="top" width="203"> <p><b>NACp (95% bound) </b></p> </td> </tr> <tr> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(0.003) </p> </td> <td valign="top" width="101"> <p>11 </p> </td> <td valign="top" width="101"> <p>(0.004) </p> </td> <td valign="top" width="101"> <p>11 </p> </td> <td valign="top" width="101"> <p>(3 m) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.01) </p> </td> <td valign="top" width="101"> <p>10 </p> </td> <td valign="top" width="101"> <p>(0.013) </p> </td> <td valign="top" width="101"> <p>10 </p> </td> <td valign="top" width="101"> <p>(10 m) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(0.04) </p> </td> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(30 m) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.1) </p> </td> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.1) </p> </td> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.05 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.2) </p> </td> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.2) </p> </td> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.1 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(0.5) </p> </td> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.6) </p> </td> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.3 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(1.0) </p> </td> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(1.0) </p> </td> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(0.5 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(2.0) </p> </td> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(2.0) </p> </td> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(1 NM) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(4.0) </p> </td> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(2 NM) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(8.0) </p> </td> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(4 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(10) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(10 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(10 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(no integrity) </p> </td> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(&gt; 20) </p> </td> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(unknown) </p> </td> </tr> </table> Table 7: NUC conversion to NIC and NACp [Amdt 20/3] --- [[42]](#_ftnref42)    The notion of version “0” and “1” differentiates between DO-260/ED-102 and DO-260A transponders. [[43]](#_ftnref43)    If provided by flight deck controls. [[44]](#_ftnref44)    If provided by flight deck controls. [[45]](#_ftnref45)    For special conditions under which the non-transmission of selected discrete emergency codes is allowed, refer to Section 8.8.2. [[46]](#_ftnref46)    Only for D0-260A based ADS-B transmit systems. Appendix 4 to AMC 20-24 ED Decision 2008/004/R Appendix 4.1: Summary of ADS-B-NRA Air-to-ground Interoperability Requirements The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126:[[42]](#_ftn42) <table border="1" cellpadding="0" cellspacing="0" width="606"><thead><tr><td colspan="2" rowspan="2" width="153"><p><b>Parameter</b></p></td><td rowspan="2" width="66"><p><b>BDS register </b></p></td><td colspan="2" width="296"><p><b>Version 0</b></p></td><td width="91"><p><b>Version 1</b></p></td></tr><tr><td width="189"><p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p></td><td width="106"><p><b>DO-260/ED102</b></p></td><td width="91"><p><b>DO-260A</b></p></td></tr></thead><tr><td colspan="2" valign="top" width="153"><p>Aircraft identification </p></td><td valign="top" width="66"><p>0.8 </p></td><td valign="top" width="189"><p>§2.3.4 </p></td><td valign="top" width="106"><p>§2.2.3.2.5 </p></td><td valign="top" width="91"><p>§2.2.3.2.5</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>SPI<a href="#_ftn43">[43]</a></p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.2.6 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.2 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.2</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Emergency indicator </p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.2.6 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.2 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.2</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Barometric altitude </p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.2.4 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.4 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.4</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Quality indicator (NUC/NIC) </p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.1 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.1 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.1</p></td></tr><tr><td rowspan="2" valign="top" width="77"><p>Airborne Position</p></td><td valign="top" width="76"><p>Latitude </p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.2.3 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.7 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.7 </p></td></tr><tr><td valign="top" width="76"><p>Longitude </p></td><td valign="top" width="66"><p>0.5 </p></td><td valign="top" width="189"><p>§2.3.2.3 </p></td><td valign="top" width="106"><p>§2.2.3.2.3.8 </p></td><td valign="top" width="91"><p>§2.2.3.2.3.8 </p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Emergency status<a href="#_ftn44">[44]</a><a href="#_ftn45">[45]</a></p></td><td valign="top" width="66"><p>6.1 </p></td><td valign="top" width="189"><p>Table 2-97 </p></td><td valign="top" width="106"><p>§2.2.3.2.7.9 </p></td><td valign="top" width="91"><p>§2.2.3.2.7.8 </p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Quality indicator (NACp) </p></td><td valign="top" width="66"><p>6.5 </p></td><td valign="top" width="189"><p>No definition </p></td><td valign="top" width="106"><p>No definition </p></td><td valign="top" width="91"><p>§2.2.3.2.7.2.7</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Quality indicator (SIL) </p></td><td valign="top" width="66"><p>6.5 </p></td><td valign="top" width="189"><p>No definition </p></td><td valign="top" width="106"><p>No definition </p></td><td valign="top" width="91"><p>§2.2.3.2.3.1.1</p></td></tr><tr><td colspan="2" valign="top" width="153"><p>Version Indicator<a href="#_ftn46">[46]</a></p></td><td valign="top" width="66"><p>6.5 </p></td><td valign="top" width="189"><p>No definition </p></td><td valign="top" width="106"><p>No definition </p></td><td valign="top" width="91"><p>§A.1.4.10.5 </p></td></tr></table> Table 5: Mandatory ADS-B-NRA Parameters The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126: <table border="1" cellpadding="0" cellspacing="0" width="607"><thead><tr><td rowspan="2" width="153"><p><b>Parameter</b></p></td><td rowspan="2" width="66"><p><b>BDS</b></p><p><b>register</b></p></td><td colspan="2" width="296"><p><b>Version 0</b></p></td><td width="91"><p><b>Version 1</b></p></td></tr><tr><td width="189"><p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p></td><td width="106"><p><b>DO-260/ED102</b></p></td><td width="91"><p><b>DO-260A</b></p></td></tr></thead><tr><td valign="top" width="153"><p>Airborne Ground Velocity</p></td><td valign="top" width="66"><p>0.9 </p></td><td valign="top" width="189"><p>§2.3.5 </p></td><td valign="top" width="106"><p>§2.2.3.2.6 </p></td><td valign="top" width="91"><p>§2.2.3.2.6 </p></td></tr></table> Table 6: Optional ADS-B-NRA Parameters Appendix 4.2: Guidance on Encoding of Positional Quality Indicators In order to be able to check the compliance of the actually transmitted ADS-B data with the required quality on the recipient side, ADS-B message transmissions contain “Quality Indicators”. These are expressed for ED-102/DO-260 and DO-260A compliant ADS-B transmit systems as follows: — ED-102/DO-260: Navigation Uncertainty Category (NUC), a combined expression of (accuracy and) integrity requirements through a single parameter; — DO-260A: Navigation Accuracy Category (NACp) to express the position accuracy (as a 95 percentile), Navigation Integrity Category (NIC) to express the integrity containment radius and Surveillance Integrity Level (SIL) to specify the probability of the true position lying outside that containment radius without alerting. Minimum acceptable NUC and NIC/NACp values in support of 5 NM ADS-B-NRA separation services, based on the requirements summarised in Table 2 of Appendix 4, are as follows in line with the “NIC/NACp to NUC” conversion table below. NUC values (encoding based on HPL, with the accuracy requirements met by GNSS systems by design and in line with the related NACp values in below conversion table): — 5 NM separation: NUC = 4; The corresponding NIC/NACp values are as follows. — 5 NM separation: NIC = 4, NACp = 5, The SIL value is established to SIL≥2 in line with the combination of the position source failure and position integrity alert failure requirements, as summarised in Table 2 of Appendix 4. Note 1: In case the SIL value is not output by the position data sources, it is recommended that the ADS-B transmit system provides for the static setting of SIL as part of the installation procedure and as demonstrated for the applicable position data source configuration. Note 2: ED-126 provides, based on its reference collision risk analysis only, arguments for an equally appropriate encoding of a SIL=2 as a matter of expressing the system integrity as well. As for the presentation of the values presented in this document, it is at the discretion of the ATSP to decide upon the appropriate threshold values required in support of the separation services in its airspace. <table border="1" cellpadding="0" cellspacing="0" width="608"><tr><td colspan="2" valign="top" width="202"><p><b>NUC (max Rc NM) </b></p></td><td colspan="2" valign="top" width="203"><p><b>NIC (max Rc NM) </b></p></td><td colspan="2" valign="top" width="203"><p><b>NACp (95% bound) </b></p></td></tr><tr><td valign="top" width="101"><p>9 </p></td><td valign="top" width="101"><p>(0.003) </p></td><td valign="top" width="101"><p>11 </p></td><td valign="top" width="101"><p>(0.004) </p></td><td valign="top" width="101"><p>11 </p></td><td valign="top" width="101"><p>(3 m) </p></td></tr><tr><td valign="top" width="101"><p>8 </p></td><td valign="top" width="101"><p>(0.01) </p></td><td valign="top" width="101"><p>10 </p></td><td valign="top" width="101"><p>(0.013) </p></td><td valign="top" width="101"><p>10 </p></td><td valign="top" width="101"><p>(10 m) </p></td></tr><tr><td colspan="2" valign="top" width="202"><p>- </p></td><td valign="top" width="101"><p>9 </p></td><td valign="top" width="101"><p>(0.04) </p></td><td valign="top" width="101"><p>9 </p></td><td valign="top" width="101"><p>(30 m) </p></td></tr><tr><td valign="top" width="101"><p>7 </p></td><td valign="top" width="101"><p>(0.1) </p></td><td valign="top" width="101"><p>8 </p></td><td valign="top" width="101"><p>(0.1) </p></td><td valign="top" width="101"><p>8 </p></td><td valign="top" width="101"><p>(0.05 NM) </p></td></tr><tr><td valign="top" width="101"><p>6 </p></td><td valign="top" width="101"><p>(0.2) </p></td><td valign="top" width="101"><p>7 </p></td><td valign="top" width="101"><p>(0.2) </p></td><td valign="top" width="101"><p>7 </p></td><td valign="top" width="101"><p>(0.1 NM) </p></td></tr><tr><td valign="top" width="101"><p>5 </p></td><td valign="top" width="101"><p>(0.5) </p></td><td valign="top" width="101"><p>6 </p></td><td valign="top" width="101"><p>(0.6) </p></td><td valign="top" width="101"><p>6 </p></td><td valign="top" width="101"><p>(0.3 NM) </p></td></tr><tr><td valign="top" width="101"><p>4 </p></td><td valign="top" width="101"><p>(1.0) </p></td><td valign="top" width="101"><p>5 </p></td><td valign="top" width="101"><p>(1.0) </p></td><td valign="top" width="101"><p>5 </p></td><td valign="top" width="101"><p>(0.5 NM) </p></td></tr><tr><td valign="top" width="101"><p>3 </p></td><td valign="top" width="101"><p>(2.0) </p></td><td valign="top" width="101"><p>4 </p></td><td valign="top" width="101"><p>(2.0) </p></td><td valign="top" width="101"><p>4 </p></td><td valign="top" width="101"><p>(1 NM) </p></td></tr><tr><td colspan="2" valign="top" width="202"><p>- </p></td><td valign="top" width="101"><p>3 </p></td><td valign="top" width="101"><p>(4.0) </p></td><td valign="top" width="101"><p>3 </p></td><td valign="top" width="101"><p>(2 NM) </p></td></tr><tr><td colspan="2" valign="top" width="202"><p>- </p></td><td valign="top" width="101"><p>2 </p></td><td valign="top" width="101"><p>(8.0) </p></td><td valign="top" width="101"><p>2 </p></td><td valign="top" width="101"><p>(4 NM) </p></td></tr><tr><td valign="top" width="101"><p>2 </p></td><td valign="top" width="101"><p>(10) </p></td><td valign="top" width="101"><p>1 </p></td><td valign="top" width="101"><p>(20) </p></td><td valign="top" width="101"><p>1 </p></td><td valign="top" width="101"><p>(10 NM) </p></td></tr><tr><td valign="top" width="101"><p>1 </p></td><td valign="top" width="101"><p>(20) </p></td><td valign="top" width="101"><p>1 </p></td><td valign="top" width="101"><p>(20) </p></td><td valign="top" width="101"><p>1 </p></td><td valign="top" width="101"><p>(10 NM) </p></td></tr><tr><td valign="top" width="101"><p>0 </p></td><td valign="top" width="101"><p>(no integrity) </p></td><td valign="top" width="101"><p>0 </p></td><td valign="top" width="101"><p>(&gt; 20) </p></td><td valign="top" width="101"><p>0 </p></td><td valign="top" width="101"><p>(unknown) </p></td></tr></table> Table 7: NUC conversion to NIC and NACp [Amdt 20/3] --- [[42]](#_ftnref42) The notion of version “0” and “1” differentiates between DO-260/ED-102 and DO-260A transponders. [[43]](#_ftnref43) If provided by flight deck controls. [[44]](#_ftnref44) If provided by flight deck controls. [[46]](#_ftnref46) Only for D0-260A based ADS-B transmit systems. Appendix 4 to AMC 20-24 ED Decision 2008/004/R Appendix 4.1: Summary of ADS-B-NRA Air-to-ground Interoperability Requirements The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126:[[42]](#_ftn42) <table border="1" cellpadding="0" cellspacing="0" width="606"> <thead> <tr> <td colspan="2" rowspan="2" width="153"> <p><b>Parameter</b></p> </td> <td rowspan="2" width="66"> <p><b>BDS register </b></p> </td> <td colspan="2" width="296"> <p><b>Version 0</b></p> </td> <td width="91"> <p><b>Version 1</b></p> </td> </tr> <tr> <td width="189"> <p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p> </td> <td width="106"> <p><b>DO-260/ED102</b></p> </td> <td width="91"> <p><b>DO-260A</b></p> </td> </tr> </thead> <tr> <td colspan="2" valign="top" width="153"> <p>Aircraft identification </p> </td> <td valign="top" width="66"> <p>0.8 </p> </td> <td valign="top" width="189"> <p>§2.3.4 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.5 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.5</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>SPI<a href="#_ftn43">[43]</a></p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.6 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.2 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.2</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Emergency indicator </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.6 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.2 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.2</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Barometric altitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.4 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.4 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.4</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (NUC/NIC) </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.1 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.1 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.1</p> </td> </tr> <tr> <td rowspan="2" valign="top" width="77"> <p>Airborne Position</p> </td> <td valign="top" width="76"> <p>Latitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.3 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.7 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.7 </p> </td> </tr> <tr> <td valign="top" width="76"> <p>Longitude </p> </td> <td valign="top" width="66"> <p>0.5 </p> </td> <td valign="top" width="189"> <p>§2.3.2.3 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.3.8 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.8 </p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Emergency status<a href="#_ftn44">[44]</a><a href="#_ftn45">[45]</a></p> </td> <td valign="top" width="66"> <p>6.1 </p> </td> <td valign="top" width="189"> <p>Table 2-97 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.7.9 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.7.8 </p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (NACp) </p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.7.2.7</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Quality indicator (SIL) </p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.3.1.1</p> </td> </tr> <tr> <td colspan="2" valign="top" width="153"> <p>Version Indicator<a href="#_ftn46">[46]</a></p> </td> <td valign="top" width="66"> <p>6.5 </p> </td> <td valign="top" width="189"> <p>No definition </p> </td> <td valign="top" width="106"> <p>No definition </p> </td> <td valign="top" width="91"> <p>§A.1.4.10.5 </p> </td> </tr> </table> Table 5: Mandatory ADS-B-NRA Parameters The minimum set of parameters that should be provided to support the ADS-B-NRA application are summarised in the following table extracted from ED-126: <table border="1" cellpadding="0" cellspacing="0" width="607"> <thead> <tr> <td rowspan="2" width="153"> <p><b>Parameter</b></p> </td> <td rowspan="2" width="66"> <p><b>BDS</b></p> <p><b>register</b></p> </td> <td colspan="2" width="296"> <p><b>Version 0</b></p> </td> <td width="91"> <p><b>Version 1</b></p> </td> </tr> <tr> <td width="189"> <p><b>ICAO Annex 10 Amendment 79, VOL III, App to chap 5 </b></p> </td> <td width="106"> <p><b>DO-260/ED102</b></p> </td> <td width="91"> <p><b>DO-260A</b></p> </td> </tr> </thead> <tr> <td valign="top" width="153"> <p>Airborne Ground Velocity</p> </td> <td valign="top" width="66"> <p>0.9 </p> </td> <td valign="top" width="189"> <p>§2.3.5 </p> </td> <td valign="top" width="106"> <p>§2.2.3.2.6 </p> </td> <td valign="top" width="91"> <p>§2.2.3.2.6 </p> </td> </tr> </table> Table 6: Optional ADS-B-NRA Parameters Appendix 4.2: Guidance on Encoding of Positional Quality Indicators In order to be able to check the compliance of the actually transmitted ADS-B data with the required quality on the recipient side, ADS-B message transmissions contain “Quality Indicators”. These are expressed for ED-102/DO-260 and DO-260A compliant ADS-B transmit systems as follows: — ED-102/DO-260: Navigation Uncertainty Category (NUC), a combined expression of (accuracy and) integrity requirements through a single parameter; — DO-260A: Navigation Accuracy Category (NACp) to express the position accuracy (as a 95 percentile), Navigation Integrity Category (NIC) to express the integrity containment radius and Surveillance Integrity Level (SIL) to specify the probability of the true position lying outside that containment radius without alerting. Minimum acceptable NUC and NIC/NACp values in support of 5 NM ADS-B-NRA separation services, based on the requirements summarised in Table 2 of Appendix 4, are as follows in line with the “NIC/NACp to NUC” conversion table below. NUC values (encoding based on HPL, with the accuracy requirements met by GNSS systems by design and in line with the related NACp values in below conversion table): — 5 NM separation: NUC = 4; The corresponding NIC/NACp values are as follows. — 5 NM separation: NIC = 4, NACp = 5, The SIL value is established to SIL≥2 in line with the combination of the position source failure and position integrity alert failure requirements, as summarised in Table 2 of Appendix 4. Note 1: In case the SIL value is not output by the position data sources, it is recommended that the ADS-B transmit system provides for the static setting of SIL as part of the installation procedure and as demonstrated for the applicable position data source configuration. Note 2: ED-126 provides, based on its reference collision risk analysis only, arguments for an equally appropriate encoding of a SIL=2 as a matter of expressing the system integrity as well. As for the presentation of the values presented in this document, it is at the discretion of the ATSP to decide upon the appropriate threshold values required in support of the separation services in its airspace. <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td colspan="2" valign="top" width="202"> <p><b>NUC (max Rc NM) </b></p> </td> <td colspan="2" valign="top" width="203"> <p><b>NIC (max Rc NM) </b></p> </td> <td colspan="2" valign="top" width="203"> <p><b>NACp (95% bound) </b></p> </td> </tr> <tr> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(0.003) </p> </td> <td valign="top" width="101"> <p>11 </p> </td> <td valign="top" width="101"> <p>(0.004) </p> </td> <td valign="top" width="101"> <p>11 </p> </td> <td valign="top" width="101"> <p>(3 m) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.01) </p> </td> <td valign="top" width="101"> <p>10 </p> </td> <td valign="top" width="101"> <p>(0.013) </p> </td> <td valign="top" width="101"> <p>10 </p> </td> <td valign="top" width="101"> <p>(10 m) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(0.04) </p> </td> <td valign="top" width="101"> <p>9 </p> </td> <td valign="top" width="101"> <p>(30 m) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.1) </p> </td> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.1) </p> </td> <td valign="top" width="101"> <p>8 </p> </td> <td valign="top" width="101"> <p>(0.05 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.2) </p> </td> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.2) </p> </td> <td valign="top" width="101"> <p>7 </p> </td> <td valign="top" width="101"> <p>(0.1 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(0.5) </p> </td> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.6) </p> </td> <td valign="top" width="101"> <p>6 </p> </td> <td valign="top" width="101"> <p>(0.3 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(1.0) </p> </td> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(1.0) </p> </td> <td valign="top" width="101"> <p>5 </p> </td> <td valign="top" width="101"> <p>(0.5 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(2.0) </p> </td> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(2.0) </p> </td> <td valign="top" width="101"> <p>4 </p> </td> <td valign="top" width="101"> <p>(1 NM) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(4.0) </p> </td> <td valign="top" width="101"> <p>3 </p> </td> <td valign="top" width="101"> <p>(2 NM) </p> </td> </tr> <tr> <td colspan="2" valign="top" width="202"> <p>- </p> </td> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(8.0) </p> </td> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(4 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>2 </p> </td> <td valign="top" width="101"> <p>(10) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(10 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(20) </p> </td> <td valign="top" width="101"> <p>1 </p> </td> <td valign="top" width="101"> <p>(10 NM) </p> </td> </tr> <tr> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(no integrity) </p> </td> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(&gt; 20) </p> </td> <td valign="top" width="101"> <p>0 </p> </td> <td valign="top" width="101"> <p>(unknown) </p> </td> </tr> </table> Table 7: NUC conversion to NIC and NACp [Amdt 20/3] --- [[42]](#_ftnref42)    The notion of version “0” and “1” differentiates between DO-260/ED-102 and DO-260A transponders. [[43]](#_ftnref43)    If provided by flight deck controls. [[44]](#_ftnref44)    If provided by flight deck controls. [[46]](#_ftnref46)    Only for D0-260A based ADS-B transmit systems.