Axnes announces Polycon to new PNG STC and trade-up program for AW139 airframes Axnes Press Release | December 15, 2020 Estimated reading time 2 minutes, 3 seconds. Wireless intercom technology innovator, Axnes has announced a comprehensive trade-up program to upgrade existing Polycon wireless intercom systems (ICS) to the new generation digital Polycon Next Generation (PNG) wireless intercom for Leonardo AW139 owners and operators. Following a developmental STC program with a large U.S. para-public AW139 operator, Axnes has received FAA Supplemental Type Certification (STC) approval for the conversion. The Axnes led program involved an initial retrofit for the AW139 as a proof of concept that led to a fleet replacement under the STC authorization.