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transmission);
• Horizontal Position (latitude and longitude);
• Horizontal Position Quality Indicator(s) (position integrity for both ED-102/DO-260
and DO-260A based ADS-B transmit systems, as well as accuracy for DO-260A based
ADS-B transmit systems);
• Barometric Altitude;
• Aircraft Identification;
• Special Position Identification (SPI);
• Emergency Status and Emergency Indicator;
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• Version Number (in aircraft operational status message, if avionics are DO-260A
compliant).
7.2 In line with ED-126 (section 4), it is recommended that the ADS-B System
meets the following optional surveillance data transmission requirement:
• Ground Velocity.
8 AIRWORTHINESS CONSIDERATIONS
8.1 Airworthiness Certification Objectives
For the purposes of the ADS-B-NRA application, the ADS-B System installed in the
aircraft needs to be designed to deliver data that satisfy the airborne domain
requirements in line with ED-126 Section 3.4, (Appendix 3 provides a summary for
information purposes).
8.2 ADS-B System
8.2.1 The (overall) ADS-B System integrity level with respect to the processing of
horizontal position data and horizontal position quality indicators, covering the
processing (and data exchange) chain from horizontal position data source(s) to ADS-B
transmit data string encoding) needs to be 10-5/fh (refer also to Table 1 in Appendix 3).
Note 1: this integrity level is required to adequately protect against the corruption of
horizontal position data and horizontal position quality indicators when applying
separation.
Note 2: These performance figures have been set for the “ADS-B out” function, to be
used in ADS-B NRA operations as laid down by the Operational Safety Assessment in
Annex C of ED 126.
Note 3: Compliance with these performance figures do not constitute per se a
demonstration that the safety objectives of ADS-B NRA operations allocated to avionics
are achieved.
Note 4: Also refer to § 3.1.
8.2.2 The (overall) ADS-B System continuity level needs to be 2*10-4/fh (refer also to
Table 1 in Appendix 3).
Note 1: These performance figures have been set for the “ADS-B out” function, to be
used in ADS-B NRA operations as laid down by the Operational Safety Assessment in
Annex C of ED 126;
Note 2: Compliance with these performance figures do not constitute per se a
demonstration that the safety objectives of ADS-B NRA operations allocated to avionics
are achieved;
Note 3: Also refer to § 3.1.
8.2.3 The latency of the horizontal position data, including any uncompensated
latency, introduced by the (overall) ADS-B System does not exceed 1.5 second in 95%
and 3 seconds in 99.9% of all ADS-B message transmission cases (refer also to Table 1
in Appendix 3).
8.3 ADS-B Transmit System
8.3.1 Compliance with the air-ground interoperability requirements, as specified in
ED-126 and presented in Section 7.1 and Appendix 4, needs to be demonstrated.
8.3.2. For 1090 MHz Extended Squitter ADS-B transmit systems, this should be
demonstrated by the relevant tests documented in:
• ED-73B/ETSO-2C112b (or DO-181C);
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• ED-102, as a minimum, or an equivalent standard which is acceptable to the Agency
(e.g. DO-260 or DO-260A).
8.3.3 ADS-B transmit systems need to transmit horizontal position quality indicators
consistent with the associated position information at the time of transmission.
For the expression of the position accuracy quality, the related indicator should therefore
reflect:
• The quality (in terms of both integrity and accuracy) of the position measurement
itself; and
• Any (uncompensated) latency incurring prior to transmission.
Note: guidance on the quality indicators is provided in Appendix 4.
The applicant needs to demonstrate the correctness of consistent quality indicator
encodings in line with (minimum) position source quality and any (uncompensated)
maximum latency as expressed in 8.2.3.
Permissible deviation for initial implementations:
For initial implementations, some aircraft installations may not take into account any
(uncompensated) latency in the encoding of the position accuracy quality indicator as
applicable at the time of transmission. Hence, such installations might transmit
horizontal position quality indicators that are consistent with the associated position
information only for lower quality indicator encodings5 (e.g. NUC=5 or NAC=5) but not
　
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