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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.
1 Uncompensated delay measured from to the time of validity of position measurement until ADS-B
transmission (i.e. at RF level).
2 As defined in section 6.
3 For GNSS based functions, expressed as an assumption of GNSS performance.
16(21)
AMC 20-24
Appendix 3
Parameter Requirement
Barometric Altitude • Accuracy: as per the installed sensors (refer
to section 8.5.2)
• Maximum Latency: 1 sec (as for SSR)
Aircraft Identification, SPI,
Emergency Status
As for SSR [AMC20-13].
Table 3: Other Minimum ADS-B Surveillance Data Requirements
Parameter Loss Corruption Note
Barometric Altitude Minor Minor As for SSR [AMC20-13].
Aircraft
Identification
Minor Minor As for SSR.[AMC20-13]
Table 4: Failure Condition Categories
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AMC 20-24
Appendix 4
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-126:1
Version 0 Version 1
Parameter
BDS
register
ICAO
Annex 10
Amendment
79, VOL III,
App to chap 5
DO-260/ED-
102
DO-260A
Aircraft identification 0.8 §2.3.4 §2.2.3.2.5 §2.2.3.2.5
SPI 2 0.5 §2.3.2.6 §2.2.3.2.3.2 §2.2.3.2.3.2
Emergency indicator 0.5 §2.3.2.6 §2.2.3.2.3.2 §2.2.3.2.3.2
Barometric altitude 0.5 §2.3.2.4 §2.2.3.2.3.4 §2.2.3.2.3.4
Quality indicator
(NUC/NIC)
0.5 §2.3.1 §2.2.3.2.3.1 §2.2.3.2.3.1
Airborne Latitude 0.5 §2.3.2.3 §2.2.3.2.3.7 §2.2.3.2.3.7
Position Longitude 0.5 §2.3.2.3 §2.2.3.2.3.8 §2.2.3.2.3.8
Emergency status 3 4 6.1 Table 2-97 §2.2.3.2.7.9 §2.2.3.2.7.8
Quality indicator (NACp) 6.5 No definition No definition §2.2.3.2.7.2.7
Quality indicator (SIL) 6.5 No definition No definition §2.2.3.2.3.1.1
Version Indicator5 6.5 No definition No definition §A.1.4.10.5
Table 5: Mandatory ADS-B-NRA Parameters
1 The notion of version “0” and “1” differentiates between DO-260/ED-102 and DO-260A
transponders.
2 If provided by flight deck controls.
3 If provided by flight deck controls.
4 For special conditions under which the non-transmission of selected discrete emergency codes is
allowed, refer to Section 8.8.2.
5 Only for D0-260A based ADS-B transmit systems.
18(21)
AMC 20-24
Appendix 4
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:
Version 0 Version 1
Parameter
BDS
register
ICAO
Annex 10
Amendment
79, VOL III,
App to chap 5
DO-260/ED-
102
DO-260A
Airborne Ground Velocity 0.9 §2.3.5 §2.2.3.2.6 §2.2.3.2.6
Table 6: Optional ADS-B-NRA Parameters
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AMC 20-24
Appendix 4
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,
　
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