The European Union Aviation Safety Agency (EASA) issued on 7 February 2024 the Service Information Bulletin (SIB) No. 2024-03R1, informing the European aviation community about an identified potential issue affecting some Satellite Based Augmentation Systems (SBAS) receivers produced by Collins Aerospace, in particular, the models GPS-4000S, GLU-2100, GLUS-2100 and GLUS-2100A.
The issue refers to a non-compliance with the applicable Minimum Operational Performance Standards (MOPS) for the SBAS receivers, the Radio Technical Commission for Aeronautics (RTCA) DO-229. The identified non-compliance could lead to an incorrect processing of the integrity information message, the Message Type 6 (MT6), sent by the SBAS system for a particular value of the fast correction issue of data (IODF) parameter (specifically, IODF=3). Under this condition, the affected SBAS receivers may not warn the aircrew in case the integrity of the computed navigation solution may be compromised.
In response to the identified risk, EASA released Safety Directive No. 2025-01 and Airworthiness Directive No. 2025-0088 on 16 April 2025, both effective from 30 April 2025. These directives classify the continued use of the affected receivers for LPV-200 operations as a potential unsafe condition. Consequently, these EASA directives require the replacement of the affected receivers already installed having airworthiness approval for LPV-200 operations within 2 years (by the 30th of April 2027), or before the next flight after having obtained the airworthiness approval for LPV-200 operations, whichever occurs later.
Further information on EASA dispositions on this matter can be consulted in the aforementioned EASA SIB No. 2024-03R1, EASA SD No. 2025-01 and AD No. 2025-0088 (e.g. Collins Aerospace SBAS receivers affected and serviceable parts, aircraft models potentially affected…).
EGNOS Safety of Life (SoL) Service for Aviation remains compliant with ICAO Standards and Recommended Practices (SARPs) in accordance with the provisions of the EGNOS SoL for Aviation Service Definition Document (SDD).