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approval of the “Enhanced Air Traffic Services in Non-Radar Areas using ADS-B
Surveillance”
ADS-B SITF/8-IP/14 -2-
Agenda Item 7
2. Discussion
2.1 The SEA ADS-B WG/3 meeting noted that Boeing and Airbus are currently using this
document for aircraft certification in support of the European Pioneer program. It was noted that
Airbus has already received EASA ADS-B approval for some aircraft. The approval resulted in
amendments to the Flight manual. Boeing is planning to certify aircraft in the near future. It was also
noted that AMC20-24 does not require GPS SA aware/SA off nor does it require GPS FDE hence
AMC20-24 aircraft could be subject to reduced availability of ADS-B signals for ATC separation
purposes.
2.2 Australia proposed to amend paragraph 8.4.6.3 to replace wording “highly desired” with
“it is required” for FDE capability in the GNSS systems compatible with TSO C-129. It was further
proposed to add a new paragraph 8.4.9 in the AMC20-24 as follows：
“For GNSS systems operating in environments where the ANSP requires ADS-B data
with (NUC>4 for DO260) or (SIL=2, NIC>5 for DO260A) and an operational
availability above 99.95%, the GNSS system shall not assume that Selective
Availability (SA) is ON.”
2.3 The meeting had lengthy discussion on the proposal. The meeting agreed that
AMC20-24 with proposed changes serves as baseline document for further consideration. The
baseline document with the proposed changes is provided in the Attachment A and Attachment B to
this paper. In view of concerns expressed regarding the AMC20-24 which was just issued by EASA
in end of April 2008 and intended application for the Enhanced Air Traffic Services in Non-Radar
Areas using ADS-B Surveillance, the meeting recommended to refer the document contained in
Attachments for further consideration by ADS-B SITF and CNS/MET Sub-group of APANAPIRG in
2009.
3. Action by the meeting
3.1 The meeting is invited to note the information provided in this paper.
_ _ _ _ _ _ _ _ _ _ _ _
AMC 20-24 Effective: 02/05/2008
Annex II to ED Decision 2008/004/R of 25/04/2008
AMC 20-24
Certification Considerations for the Enhanced ATS in Non-Radar Areas using
ADS-B Surveillance (ADS-B-NRA) Application via 1090 MHZ Extended Squitter.
1 PREAMBLE
1.1 The scope of this Acceptable Means of Compliance (AMC) is the airworthiness
and operational approval of the “Enhanced Air Traffic Services in Non-Radar Areas using
ADS-B Surveillance” (ADS-B-NRA) application.
1.2 Operational benefits of the ADS-B-NRA application include the enhancement of
the Air Traffic Control Service in current non-radar airspace. ADS-B-NRA would provide
controllers with improved situational awareness of aircraft positions, and in consequence
appropriate separation minima could be applied depending on the environment and the
approval of the competent authority. Current non-radar airspace is controlled using
procedural methods which demand large separations. ADS-B-NRA separation minima
would be smaller than that used in current non-radar airspace. Alerting Services in nonradar
airspace will be enhanced by more accurate information on the latest position of
aircraft.
Hence, it is expected that in areas where radar coverage is not feasible or not
economically justified this application will provide benefits to capacity, efficiency and
safety in a way similar to what would be achieved by use of SSR radar.
1.3 The European CASCADE programme is the mechanism for co-ordination of the
European implementation of ADS-B (ADS-B-NRA and other ADS-B based ground and
airborne surveillance applications). One of the programme’s aims is to ensure
harmonisation and efficiency of implementation.
1.4 CASCADE uses the globally interoperable 1090 MHz Extended Squitter (ES)
data link technology, compliant with ICAO SARPS in Annex 10 and in line with the
recommendations of the Conference ICAO ANC-11.
1.5 In parallel, the FAA Airservices Australia and Nav Canada plan to deploy ADS-B
using the same data link technology. It is assumed that aircraft will be interoperable with
all implementation programmes using the EUROCAE/RTCA ADS-B-NRA standard (ED-
126, DO-303).
1.6 The meaning of abbreviations may be found in Appendix 1.
2 PURPOSE
2.1 This AMC is for operators seeking to operate in airspace classifications A to E
where ADS-B-NRA services have been implemented by the Air Navigation Service
Provider. It provides the basis for approval of aircraft systems and identifies operational
considerations.
It may also assist other stakeholders by alerting them to aircraft requirements, operator
　
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