AMC1 ACNS.C.PBN.560 Vertical accuracy when
using SBAS/GNSS geometric altitude sources
ED Decision 2019/011/R
The vertical total system error (TSEZ) is dependent on the navigation system error (NSE), the path definition error (PDEZ) and the flight technical error (FTEZ).
(a) Navigation system error (NSE)
The NSE should be within the accuracy requirements of ICAO Annex 10, Volume 1 to the Chicago Convention with respect to signal-in-space performance. These NSE requirements are considered to be fulfilled without any demonstration if the equipment has been granted an ETSO authorisation against ETSO-C145c, operational Class 3 or ETSO-C146c, operational Class 3 or 4.
(b) Flight technical error (FTEZ)
FTEZ is considered to be equivalent to the ILS approach if the angular deviations are displayed to the flight crew on the existing or comparable display, and the system meets the integration criteria of paragraph 7(a) of Appendix C to Subpart C of CS-ACNS and the SBAS/GNSS receiver has been granted an ETSO authorisation against ETSO-C145c, operational Class 3 or ETSO-C146c, operational Class 3 or 4.
For flight guidance systems, the FTEZ performance is considered acceptable if it meets the criteria of paragraph 7(a) of Appendix C to Subpart C of CS-ACNS and the SBAS/GNSS receiver has been granted an ETSO authorisation against ETSO-C145c, operational Class 3 or ETSO-C146c, operational Class 3 or 4.
(c) Path definition error (PDEZ)
For approaches to LPV minima, there are no performance or demonstration requirements for PDEZ. PDEZ is considered negligible based on the requirements for the FAS data block generation process.
For approaches to LNAV/VNAV minima, the applicant may assume that the PDEZ is negligible, provided that the RNP system’s internal resolution is equal to or better than the resolution provided for the path definition.
[Issue: CS-ACNS/2]
EASA aviation regulations for SBAS/GNSS vertical accuracy require navigation system error (NSE) compliance with ICAO standards, achievable via ETSO authorization. Flight technical error (FTEZ) mirrors ILS approaches with specific display and integration criteria. Path definition error (PDEZ) is negligible for LPV approaches, and minimal for LNAV/VNAV with sufficient RNP system resolution.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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