Appendix 3 to ETSO-2C204a

• ED Decision 2020/011/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

###### Appendix 3 to ETSO-2C204a *ED Decision 2020/011/R* This Appendix describes the EASA modifications to RTCA document DO-229E, Section 2. In Section 2.1.1.2, after the first sentence, add the following: ‘The demodulation of data from the GPS signals shall be restricted to the necessary subset of the data defined in Appendix II to IS-GPS-200D, “Navstar GPS Space Segment/Navigation User Interfaces”, December 2004, provided on RF link L1. The pseudo-ranging shall be performed on RF link L1 utilising the coarse/acquisition (C/A) code.’ This is to ensure that only the L1 NAV data, for which the SBAS provides corrections and integrity, is used, and that no CNAV data, which is defined in Appendix III to IS-GPS-200D, is used, for which the SBAS does not provide integrity. [Amdt ETSO/16]