EASA updates SIB on GNSS Outage and Alterations


The European Union Aviation Safety Agency (EASA) has updated the Safety Information Bulletin (SIB) on Global Navigation Satellite System (GNSS) Outage and Alterations Leading to Navigation / Surveillance Degradation. SIB 2022-02 was first published on March 17, 2022 and then updated to Revision 1 (R1) on February 17, 2023. Revision 2 has been published today, November 6, 2023 on the EASA SIB Tool. This follows EASA analysis of recent data from the Network of Analysts and open sources that has concluded that GNSS jamming and/or spoofing has shown further increase in the severity of its impact, as well as an overall growth of intensity and sophistication of these events.

This revision provides the following updated information:

  • Examples of symptoms of suspected GNSS spoofing for aircraft <no change>.
  • The list of the most affected flight information regions (FIR) <no change>.
  • Examples of issues that a degradation of GNSS signal (including Satellite Based Augmentation Systems (SBAS) and Ground Based Augmentation Systems (GBAS)) could generate with the addition of references to Terrain Avoidance and Warning Systems (TAWS).
  • Revised recommendations for civil aviation authorities (CAAs), air traffic management/ air navigation services (ATM/ANS) providers and air operators (including helicopter operators – with specific information on both jamming and spoofing that flight crews and relevant flight operations personnel should be aware of). New for this revision are also recommendations for aircraft and equipment manufacturers.

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