TT31 Transponder Installation Manual 1 February 2010
00455-00 Issue AJ
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Page 30 Trig Avionics Limited
12. ADS-B Compliance
TT31 transponders with software version 2.3 and above include support for Extended Squitter ADS-B
out. The TT31 is a DO-260A change 2 compliant category B0 broadcast-only participant, which also
meets the power output levels for category B1.
12.1 ADS-B Parameters Supported
The following table lists the ADS-B parameters that are transmitted by the TT31 transponder when
connected to an appropriate GPS receiver.
Parameter BDS Register
SPI 0,5
Emergency Indicator 0,5
Barometric Altitude 0,5
Quality Indicator (NIC) 0,5
Latitude 0,5
Airborne Position
Longitude 0,5
Quality Indicator (NIC) 0,6
Latitude 0,6
Surface Position
Longitude 0,6
Surface Ground Speed 0,6
Surface Ground Track 0,6
Aircraft Identification 0,8
Airborne Ground Velocity 0,9
Emergency Status 6,1
Quality Indicator (NACp) 6,5
Quality Indicator (SIL) 6,5
Version Indicator 6,5
Surface Length/Width 6,5
In addition the TEST message with 4096 squawk code information can also be transmitted to support
coordination with ATC radar systems. TEST message transmission status is an installation option.
12.2 ADS-B Service Levels
ADS-B forms part of the future plans for airspace management, and is being deployed in certain limited
applications. The following summary of the ADS-B service is current at the date of publication of this
manual, but you should be aware that regulatory changes are taking place in this area, and the most
recent regulatory information should be consulted.
There are currently three levels of service that an ADS-B transmitter can provide.
Operational ADS-B Surveillance
EASA has published the certification requirements for using
ADS-B position information for Air Traffic Control services in a
non-radar environment, AMC20-24. AMC20-24 includes both
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