Avionics
FAA Releases Revised ADS-B Advisory Circular
New version of AC 20-165B includes significant changes to help facilitate ADS-B OUT upgrades.

The FAA has published AC 20-165B, Airworthiness Approval of Automatic Dependent Surveillance-Broadcast Out Systems, the guidance material for those seeking approval for installation of ADS-B Out systems. According to the Aircraft Electronics Association, “The revision to AC 20-165 contains a number of significant changes.” These include the elimination of “the criteria that ADS-B Out transmitters and position sources be automatically treated as a major alteration.”


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