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This Continuing Airworthiness Notice (CAN) is issued to advise users of the above mentioned Garmin GTN Xi products that these units are sending erroneous ADS-B OUT data. This issue is described in Garmin Service Advisory 20140 revision B, dated 12 January 2021.

The CAN is issued to advise operators, installers and maintenance providers that certain ADS-B In equipment installations may have been installed under AC43-14, revision 5, Appendix 9, which is not considered to be Acceptable Technical Data (ATD) for ADS-