Published date: 28 April 2021


This Advisory Circular (AC) is intended to clarify the intent of the rule for providers, those intending to provide UNICOM and AWIB services, and persons providing basic radio communications in the aeronautical radio bands. It provides advice on whether a service is a UNICOM or AWIB service and general advisory information and methods acceptable to the Authority for showing compliance with the UNICOM and AWIB service requirements under Part 139 Aerodromes Certification, Operation and Use.

Related rules

This AC relates specifically to Part 139 Subpart F.

Change notice

This is Revision 1 of this AC. It updates out-of-date links at section GM 139.357–AIS notification of service and other places, and deletes sections relating to revoked parts of Part 139.