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20-177 - Design and Installation Guidance for an Airborne System for Non-Required Telecommunication Service in Non Aeronautical Frequency Bands

Date Issued
February 28, 2012
Responsible Office
AIR-130,  Aviation Safety - Aircraft Certification Service, Aircraft Engineering Division

A.  In this advisory circular (AC), the Federal Aviation Administration (FAA) recommends one way to gain airworthiness approval for an Airborne System for Non-Required Telecommunication (ASNRT) service equipment in the cockpit.  This AC is not mandatory and does not constitute a regulation.  This AC describes an acceptable means, but not the only means, to gain airworthiness approval for your ASNRT equipment.  However, if you use the means described in this AC, you must follow it in its entirety.

 B.  ASNRT equipment is intended to provide flight crews with voice and data communication service over non aeronautical frequency bands.  ASNRT consists of electronic onboard equipment which is not required for any phase of operation nor intended for Minimum Equipment List (MEL) dispatch relief. 

 C.  The guidelines contained in this AC are not intended to support airborne systems used for safety of flight communication such as Air Traffic Services (ATS), Airline Operational Control (AOC), or communication systems used to fulfill an operating requirement for a communication system.  In addition, this AC provides guidance for aircraft equipment capable of subscribing to the FAA System Wide Information Management (SWIM) infrastructure.