Previous TT21/TT22 Service Bulletins for pilots
TT21 and TT22 Transponders
Software versions run numerically, the higher the number the more recent the release – so the latest software will always include all the features of earlier versions.
17/04/2018 version 2.13 – Current software version
This software improves GPS-only air/ground determination algorithm for ADS-B Out.
04/09/2017 version 2.12
This software adds support for Trig TN72 as a FAR 91.227 compliant ADS-B position source and adds GPS only air-ground determination algorithm for ADS-B Out.
24/03/2017 version 2.11
This software improves general transponder behaviour in gliders implementing ADS-B. 2.11 also adds some minor performance improvements.
28/10/2016 version 2.10
This software adds compatibility with GPS position sources, such as the Trig TN72.
11/06/2015 version 2.7
This adds compatibility with Garmin’s ADS-B Plus protocol for GNS and GTN navigators. This allows these Garmin units to be used as the GPS source for certified ADS-B Out. Additional support added for Trig ADS-B protocol, this allows Avidyne’s IFD440/540 to be used as the GPS source for ADS-B. Certain transponder warning messages will clear when the warning conditions are no longer present. Introduction of support for TSO-C199 TABS GPS position sources.
14/09/2012 version 2.4
Updates ADS-B Extended Squitter functionality to RTCA DO-260B standard (required by 14 CFR 91.227). New interfaces added for Garmin 4X0W and 5X0W and further interface improvements made.
09/03/2010 version 1.4
This software adds the ability to receive TIS ‘A’ traffic in relevant US airspace.
30/06/2009 version 1.2
This version improves transponder operation in high temperature environments.