Appendix 3 to AMC 20-24

• ED Decision 2008/004/R found in: AMC-20 Amdt 23 - Airworthiness of Products, Parts and Appliances (Jan 2022)

Appendix 3 to AMC 20-24 ED Decision 2008/004/R Summary of ADS-B-NRA Airborne Safety and Performance Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td valign="top" width="304"> <p><b>Parameter </b></p> </td> <td valign="top" width="304"> <p><b>Requirement </b></p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position and Horizontal Position Quality Indicator(s) </p> </td> <td valign="top" width="304"> <p>10^-5/fh </p> </td> </tr> <tr> <td valign="top" width="304"> <p>ADS-B System Continuity </p> </td> <td valign="top" width="304"> <p>2*10^-4/fh </p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position Latency<a href="#_ftn39">[39]</a></p> </td> <td valign="top" width="304"> <p>1.5 sec/95% </p> </td> </tr> </table> Table 1: Overall Minimum Airborne ADS-B System[[40]](#_ftn40) Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td valign="top" width="304"> <p><b>Parameter </b></p> </td> <td valign="top" width="304"> <p><b>Requirement  </b></p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position Source </p> </td> <td valign="top" width="304"> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Accuracy (95%)</p> </td> <td valign="top" width="304"> <p>—             5 NM Sep: 926 m</p> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Integrity </p> </td> <td valign="top" width="304"> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Containment Radius (Rc) </p> </td> <td valign="top" width="304"> <p>—             5 NM Sep: Rc=2 NM </p> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Source Failure Probability </p> </td> <td valign="top" width="304"> <p>10^-4/h<a href="#_ftn41">[41]</a></p> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Alert Failure Probability </p> </td> <td valign="top" width="304"> <p>10^-3 (per position source failure event) </p> </td> </tr> <tr> <td valign="top" width="304"> <p>—             Time to Alert </p> </td> <td valign="top" width="304"> <p>—             5 NM Sep: 10 sec </p> </td> </tr> </table> Table 2: Minimum Horizontal Position Source Requirements Note: for DO-260 based ADS-B transmit systems, the related encoding of the horizontal position quality indicator through the Navigation Uncertainty Category (NUC) effectively leads to a containment radius requirement of 1NM for a 5 NM separation service. Note: accuracy and integrity containment radius requirements are expressed here as guidance to related horizontal position source regulation (refer to section 8.4). Note: the containment bound requirements reflect the outcomes of both the collision risk assessment (CAP) and time-to-alert assessment. Note: the accuracy and integrity containment radius requirements have to be met by the horizontal position source, taking into account the effects of on-board latency (if not compensated for). An uncompensated latency of 1.5 seconds translates into a dilution in the order of 450 metres (assuming an aircraft speed of 600 knots in en-route airspace). This value of 450 metres has to be added to the actual performance of the horizontal position source(s), the sum of which has to be within the required bounds. The GNSS equipment specified in 8.4.6 meets the overall accuracy and integrity requirements, including the effects of an uncompensated latency of maximum 1.5 second accumulated up to the time of transmission. <table border="1" cellpadding="0" cellspacing="0" width="601"> <tr> <td valign="top" width="301"> <p><b>Parameter</b></p> </td> <td valign="top" width="301"> <p><b>Requirement</b></p> </td> </tr> <tr> <td valign="top" width="301"> <p>Barometric Altitude </p> </td> <td valign="top" width="301"> <p>—             Accuracy: as per the installed sensors (refer to section 8.5.2) </p> <p>—             Maximum Latency: 1 sec (as for SSR) </p> </td> </tr> <tr> <td valign="top" width="301"> <p>Aircraft Identification, SPI, Emergency Status </p> </td> <td valign="top" width="301"> <p>As for SSR [AMC20-13]. </p> </td> </tr> </table> Table 3: Other Minimum ADS-B Surveillance Data Requirements <table border="1" cellpadding="0" cellspacing="0" width="602"> <tr> <td valign="top" width="159"> <p><b>Parameter </b></p> </td> <td valign="top" width="142"> <p><b>Loss</b></p> </td> <td valign="top" width="142"> <p><b>Corruption</b></p> </td> <td valign="top" width="160"> <p><b>Note</b></p> </td> </tr> <tr> <td valign="top" width="159"> <p>Barometric Altitude </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="160"> <p>As for SSR [AMC20-13].</p> </td> </tr> <tr> <td valign="top" width="159"> <p>Aircraft Identification </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="160"> <p>As for SSR.[AMC20-13]</p> </td> </tr> </table> Table 4: Failure Condition Categories [Amdt 20/3] --- [[39]](#_ftnref39)    Uncompensated delay measured from to the time of validity of position measurement until ADS-B transmission (i.e. at RF level). [[40]](#_ftnref40)    As defined in section 6. [[41]](#_ftnref41)    For GNSS based functions, expressed as an assumption of GNSS performance. Appendix 3 to AMC 20-24 ED Decision 2008/004/R Summary of ADS-B-NRA Airborne Safety and Performance Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td valign="top" width="304"> <p><b>Parameter </b></p> </td> <td valign="top" width="304"> <p><b>Requirement </b></p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position and Horizontal Position Quality Indicator(s) </p> </td> <td valign="top" width="304"> <p>10^-5/fh </p> </td> </tr> <tr> <td valign="top" width="304"> <p>ADS-B System Continuity </p> </td> <td valign="top" width="304"> <p>2*10^-4/fh </p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position Latency<a href="#_ftn39">[39]</a></p> </td> <td valign="top" width="304"> <p>1.5 sec/95% </p> </td> </tr> </table> Table 1: Overall Minimum Airborne ADS-B System[[40]](#_ftn40) Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"> <tr> <td valign="top" width="304"> <p><b>Parameter </b></p> </td> <td valign="top" width="304"> <p><b>Requirement  </b></p> </td> </tr> <tr> <td valign="top" width="304"> <p>Horizontal Position Source </p> </td> <td valign="top" width="304"> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Accuracy (95%)</p> </td> <td valign="top" width="304"> <p>—      5 NM Sep: 926 m</p> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Integrity </p> </td> <td valign="top" width="304"> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Containment Radius (Rc) </p> </td> <td valign="top" width="304"> <p>—      5 NM Sep: Rc=2 NM </p> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Source Failure Probability </p> </td> <td valign="top" width="304"> <p>10^-4/h<a href="#_ftn41">[41]</a></p> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Alert Failure Probability </p> </td> <td valign="top" width="304"> <p>10^-3 (per position source failure event) </p> </td> </tr> <tr> <td valign="top" width="304"> <p>—      Time to Alert </p> </td> <td valign="top" width="304"> <p>—      5 NM Sep: 10 sec </p> </td> </tr> </table> Table 2: Minimum Horizontal Position Source Requirements Note: for DO-260 based ADS-B transmit systems, the related encoding of the horizontal position quality indicator through the Navigation Uncertainty Category (NUC) effectively leads to a containment radius requirement of 1NM for a 5 NM separation service. Note: accuracy and integrity containment radius requirements are expressed here as guidance to related horizontal position source regulation (refer to section 8.4). Note: the containment bound requirements reflect the outcomes of both the collision risk assessment (CAP) and time-to-alert assessment. Note: the accuracy and integrity containment radius requirements have to be met by the horizontal position source, taking into account the effects of on-board latency (if not compensated for). An uncompensated latency of 1.5 seconds translates into a dilution in the order of 450 metres (assuming an aircraft speed of 600 knots in en-route airspace). This value of 450 metres has to be added to the actual performance of the horizontal position source(s), the sum of which has to be within the required bounds. The GNSS equipment specified in 8.4.6 meets the overall accuracy and integrity requirements, including the effects of an uncompensated latency of maximum 1.5 second accumulated up to the time of transmission. <table border="1" cellpadding="0" cellspacing="0" width="601"> <tr> <td valign="top" width="301"> <p><b>Parameter</b></p> </td> <td valign="top" width="301"> <p><b>Requirement</b></p> </td> </tr> <tr> <td valign="top" width="301"> <p>Barometric Altitude </p> </td> <td valign="top" width="301"> <p>—      Accuracy: as per the installed sensors (refer to section 8.5.2) </p> <p>—      Maximum Latency: 1 sec (as for SSR) </p> </td> </tr> <tr> <td valign="top" width="301"> <p>Aircraft Identification, SPI, Emergency Status </p> </td> <td valign="top" width="301"> <p>As for SSR [AMC20-13]. </p> </td> </tr> </table> Table 3: Other Minimum ADS-B Surveillance Data Requirements <table border="1" cellpadding="0" cellspacing="0" width="602"> <tr> <td valign="top" width="159"> <p><b>Parameter </b></p> </td> <td valign="top" width="142"> <p><b>Loss</b></p> </td> <td valign="top" width="142"> <p><b>Corruption</b></p> </td> <td valign="top" width="160"> <p><b>Note</b></p> </td> </tr> <tr> <td valign="top" width="159"> <p>Barometric Altitude </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="160"> <p>As for SSR [AMC20-13].</p> </td> </tr> <tr> <td valign="top" width="159"> <p>Aircraft Identification </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="142"> <p>Minor </p> </td> <td valign="top" width="160"> <p>As for SSR.[AMC20-13]</p> </td> </tr> </table> Table 4: Failure Condition Categories [Amdt 20/3] --- [[39]](#_ftnref39)    Uncompensated delay measured from to the time of validity of position measurement until ADS-B transmission (i.e. at RF level). [[41]](#_ftnref41)    For GNSS based functions, expressed as an assumption of GNSS performance. Appendix 3 to AMC 20-24 ED Decision 2008/004/R Summary of ADS-B-NRA Airborne Safety and Performance Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"><tr><td valign="top" width="304"><p><b>Parameter </b></p></td><td valign="top" width="304"><p><b>Requirement </b></p></td></tr><tr><td valign="top" width="304"><p>Horizontal Position and Horizontal Position Quality Indicator(s) </p></td><td valign="top" width="304"><p>10^-5/fh </p></td></tr><tr><td valign="top" width="304"><p>ADS-B System Continuity </p></td><td valign="top" width="304"><p>2*10^-4/fh </p></td></tr><tr><td valign="top" width="304"><p>Horizontal Position Latency<a href="#_ftn39">[39]</a></p></td><td valign="top" width="304"><p>1.5 sec/95% </p></td></tr></table> Table 1: Overall Minimum Airborne ADS-B System[[40]](#_ftn40) Requirements <table border="1" cellpadding="0" cellspacing="0" width="608"><tr><td valign="top" width="304"><p><b>Parameter </b></p></td><td valign="top" width="304"><p><b>Requirement </b></p></td></tr><tr><td valign="top" width="304"><p>Horizontal Position Source </p></td><td valign="top" width="304"></td></tr><tr><td valign="top" width="304"><p>— Accuracy (95%)</p></td><td valign="top" width="304"><p>— 5 NM Sep: 926 m</p></td></tr><tr><td valign="top" width="304"><p>— Integrity </p></td><td valign="top" width="304"></td></tr><tr><td valign="top" width="304"><p>— Containment Radius (Rc) </p></td><td valign="top" width="304"><p>— 5 NM Sep: Rc=2 NM </p></td></tr><tr><td valign="top" width="304"><p>— Source Failure Probability </p></td><td valign="top" width="304"><p>10^-4/h<a href="#_ftn41">[41]</a></p></td></tr><tr><td valign="top" width="304"><p>— Alert Failure Probability </p></td><td valign="top" width="304"><p>10^-3 (per position source failure event) </p></td></tr><tr><td valign="top" width="304"><p>— Time to Alert </p></td><td valign="top" width="304"><p>— 5 NM Sep: 10 sec </p></td></tr></table> Table 2: Minimum Horizontal Position Source Requirements Note: for DO-260 based ADS-B transmit systems, the related encoding of the horizontal position quality indicator through the Navigation Uncertainty Category (NUC) effectively leads to a containment radius requirement of 1NM for a 5 NM separation service. Note: accuracy and integrity containment radius requirements are expressed here as guidance to related horizontal position source regulation (refer to section 8.4). Note: the containment bound requirements reflect the outcomes of both the collision risk assessment (CAP) and time-to-alert assessment. Note: the accuracy and integrity containment radius requirements have to be met by the horizontal position source, taking into account the effects of on-board latency (if not compensated for). An uncompensated latency of 1.5 seconds translates into a dilution in the order of 450 metres (assuming an aircraft speed of 600 knots in en-route airspace). This value of 450 metres has to be added to the actual performance of the horizontal position source(s), the sum of which has to be within the required bounds. The GNSS equipment specified in 8.4.6 meets the overall accuracy and integrity requirements, including the effects of an uncompensated latency of maximum 1.5 second accumulated up to the time of transmission. <table border="1" cellpadding="0" cellspacing="0" width="601"><tr><td valign="top" width="301"><p><b>Parameter</b></p></td><td valign="top" width="301"><p><b>Requirement</b></p></td></tr><tr><td valign="top" width="301"><p>Barometric Altitude </p></td><td valign="top" width="301"><p>— Accuracy: as per the installed sensors (refer to section 8.5.2) </p><p>— Maximum Latency: 1 sec (as for SSR) </p></td></tr><tr><td valign="top" width="301"><p>Aircraft Identification, SPI, Emergency Status </p></td><td valign="top" width="301"><p>As for SSR [AMC20-13]. </p></td></tr></table> Table 3: Other Minimum ADS-B Surveillance Data Requirements <table border="1" cellpadding="0" cellspacing="0" width="602"><tr><td valign="top" width="159"><p><b>Parameter </b></p></td><td valign="top" width="142"><p><b>Loss</b></p></td><td valign="top" width="142"><p><b>Corruption</b></p></td><td valign="top" width="160"><p><b>Note</b></p></td></tr><tr><td valign="top" width="159"><p>Barometric Altitude </p></td><td valign="top" width="142"><p>Minor </p></td><td valign="top" width="142"><p>Minor </p></td><td valign="top" width="160"><p>As for SSR [AMC20-13].</p></td></tr><tr><td valign="top" width="159"><p>Aircraft Identification </p></td><td valign="top" width="142"><p>Minor </p></td><td valign="top" width="142"><p>Minor </p></td><td valign="top" width="160"><p>As for SSR.[AMC20-13]</p></td></tr></table> Table 4: Failure Condition Categories [Amdt 20/3] --- [[39]](#_ftnref39) Uncompensated delay measured from to the time of validity of position measurement until ADS-B transmission (i.e. at RF level). [[41]](#_ftnref41) For GNSS based functions, expressed as an assumption of GNSS performance.