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5.1 Air Traffic Service Provider (ATSP)
ATSP implements the ADS-B-NRA application compliant with relevant requirements of
the safety, performance and interoperability requirements of EUROCAE standard ED-126.
Deviations from, or supplements to the established standards are assessed by the ATSP.
Deviations that potentially impact the airborne domain should be assessed in
coordination with relevant stakeholders as per ED78A.
Section 8 of this document, “Airworthiness Considerations”, lists permissible deviations
from the target requirements related to the use of existing aircraft installations in
support of initial implementations4. These deviations are currently considered
operationally acceptable under the assumption that ground mitigation means as
discussed in the following subsections, are implemented, at the descretion of the ATSP.
5.1.1 Consistency of position quality indicators with associated position information at
time of transmission
In cases where position quality indicators are not consistent with actual position quality
(e.g., due to uncompensated latency in position transmissions), the implementing ATSP
might:
• treat the higher quality indicator encodings as an advised lower one (e.g. NUC=7
may be treated as NUC=5) or,
• consider, for separation purpose, a quality indicator more stringent than the one
stated in ED-126 (e.g. NUC =5 rather than NUC=4).
5.1.2 Encoding of NUC Quality Indicator (DO-260 compliant transponders)
In order to mitigate the encoding of the NUC quality indicator based on accuracy quality
information (HFOM) in the case of the unavailability of the GPS RAIM function (i.e.
unavailability of HPL information), the implementing ATSP may, for instance, rely on the
analysis of the frequency and duration of the unavailability of the RAIM function (as part
of the local safety assessment).
5.1.3 Transmission of generic emergency indicator only
In order to mitigate the transmission of only the generic emergency indicator (and not
also the discrete codes selected by the flight crew), It is assumed that appropriate
operational procedures have been established by the implementing ATSP and that pilots
and controllers have been trained in their use.
4 Refer to sections 8.3.3, 8.3.5 and 8.8.2.
3(21)
AMC 20-24 Effective: 02/05/2008
Annex II to ED Decision 2008/004/R of 25/04/2008
5.1.4 Communications Service Provider (CSP)
In case of CSPs providing (part of) the ground surveillance data communication services
(operation of ADS-B ground stations and/or surveillance data networks), the CSP is
committed to provide communication services to ATSPs with the expected Quality of
Service as defined in a specific Service Level Agreement.
The Service Level Agreement is bilaterally agreed between the CSP and an ATSP. The
terms of reference of the Service Level Agreement are consistent with the performance
requirements of the ED-126 document.
5.2 Aeronautical Information Service
Each State publishes in its AIP/NOTAM, or equivalent notification, information related to
the surveillance provisions, schedule, relevant procedures and confirmation of
compliance with ED-126.
6 SYSTEM DESCRIPTION
The basic concept of ADS-B involves the broadcasting of surveillance information from
aircraft via a data link.
To support the ADS-B-NRA application, the overall ADS-B avionics system (in the
following referred to as “ADS-B System”) would need to provide the following
functions:
• Adequate surveillance data provision capability;
• ADS-B message processing (encoding and generation);
• ADS-B message transmission (1090 MHz ES airborne surveillance data-link);
Whereas the latter two functions are incorporated in the 1090 MHz ES ADS-B transmit
system, the surveillance data provision is realised through various on-board surveillance
data sources (e.g. horizontal position source, barometric altimetry, ATC transponder
control panel).
The horizontal position accuracy and integrity requirements of the ADS-B-NRA
application are associated with quality indicators which form part of the air-to-ground
ADS-B message exchange. The interconnecting avionics architecture is part of the ADS-B
System.
7 FUNCTIONAL CRITERIA
Note: ICAO and EUROCAE/RTCA interoperability references, including aspects of range
and resolution of the various data items listed hereafter, for both ED-102/DO-260 and
DO-260A equipment-based ADS-B transmit systems, are presented in Appendix 4.
7.1 In line with ED-126 (section 4), the ADS-B System needs to meet the following
surveillance data transmission requirements, as a minimum:
• A unique ICAO 24 bit aircraft address (contained within each ADS-B message
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