Appendix A – Background information on Mode A/C surveillance systems
ED Decision 2022/008/R
This Appendix provides additional references, background information, and guidance for maintenance testing, as appropriate to Mode A/C surveillance installations.
ETSO-C74d, Minimum Performance Standards for Airborne ATC Transponder Equipment.
(i) ICAO Annex 10, Volume IV, Aeronautical Communications (Surveillance Radar and Collision Avoidance Systems), Amdt 85;
(ii) ICAO Document 8168-OPS/611 Volume I, Procedures for Air Navigation Services, Aircraft Operations;
(iii) ICAO Document 4444-ATM/501, Procedures for Air Navigation Service, Air Traffic Management; and
(iv) ICAO EUR Regional Air Navigation Plan, Part IV, CNS Supplement SSR Code Allocation List for the EUR region, current edition.
(i) ED-43, Minimum Operational Performance Requirements for SSR Transponder and Alticoder; and
(ii) ED-26, Minimum Performance Specification for Airborne Altitude Measurement and Coding Systems.
(iii) EUROCAE document 1/WG9/71 June 1972 MPS for airborne secondary surveillance radar transponder apparatus - Including Amendment N°1 (measurement procedures)-April 1974 & Amendment N°2-January 2000
(i) DO-144A Minimum Operational Performance Standards (MOPS)
The following diagram presents the Mode A and C transponder and its main functional interfaces.
Mode A and C Transponder Top antenna Bottom antenna Altitude source IDENT (SPI) interface Mode A code interface
[Issue: CS-ACNS/4]
Mode A/C surveillance systems guidance covers maintenance testing, referencing EASA, ICAO, EUROCAE, and RTCA standards. It details transponder equipment performance, air navigation procedures, altitude measurement, and operational requirements. A diagram illustrates Mode A/C transponder interfaces, including antennas, altitude source, and code inputs.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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