TT31 Mode S Transponder


TT31 Mode S Transponder

TT31 Mode S Transponder

Catalog No:

Manufacturer: TRIG

Trig’s TT31 transponder is the perfect retro-fit for popular Bendix King KT76A and KT78A transponders. The TT31 is a certified Class 1 Mode S transponder which will ‘plug and play’ straight into the existing Bendix King tray. It is now possible to install the TT31 and configure ADS-B Out using the original tray. This significantly reduces both installation time and cost. It provides pilots with class leading Mode S technology that is 1090ES ADS-B Out capable.

Now STC'd for interface with Garmin GNS400W/500W series navigators for full ADS-B compliance. Please see STC AML for aircraft and equipment applicability.

·         Retrofit – ‘plug and play’ installation for KT6A and KT78A transponders

·         Mode S and 1090ES ADS-B Out capable

·         Certified to FAA TSO C166b - 2020 ‘mandate ready’ ADS-B Out solution

·         Now use the original BK tray for ADS-B Out (requires version 3.11 or later software)

·         Lowest power consumption in class

·         240 watts nominal output

·         Great functionality and performance

·         TIS traffic capabilities

·         Backlit LCD display

·         No cavity tube – no warm up time required

·         No need for dropper resistors

·         Unbeatable value and quality - designed and manufactured in the U.K.

·         Two year worldwide warranty

·         Free FAA ADS-B STC – covers 650 aircraft types and various GPS combinations (see below)

Our exciting FAA ADS-B STC program provides aircraft owners with a highly cost effective way to become ADS-B complaint, using existing panel mounted WAAS GPS equipment or a blind WAAS GPS device. Our STC covers 650 general aviation aircraft, compatible with popular WAAS GPS equipment that includes; popular Garmin GTN and GNS navigators, Trig TN70, FreeFlight 1201 and NexNav Mini units.   


The TT31 is the most power efficient transponder available today; it’s easy to use and operate, with a clear bright display and simple user interface. Features include a flight timer, stop watch and altitude monitor to alert you of a deviation from your selected altitude. In the U.S. the TT31 includes data link support for TIS traffic uplinked from approach radars. TIS traffic can be displayed on a variety of cockpit displays, and coverage includes most US terminal areas.

Mode A and C transponders are now being replaced by Mode S. This advanced technology is optimised for tomorrow’s airspace requirements. By 2020 all pilots in U.S. controlled airspace will require a certified ADS-B Out capability. The advent of ADS-B technology now means the modern transponder has become the heart of future airspace compliance requirements. Here the TT31 remains the transponder of choice. The TT31 is certified to TSO C166b the latest FAA standard for the 2020 ADS-B mandate and demonstrates Trig’s advanced levels of compliance.

Pilots can buy the TT31 with confidence. With a certified WAAS GPS and a ground air determination device the TT31 forms the ideal hub of your future 2020 ADS-B solution today. In fact it’s worth remembering that to receive all ADS-B In transmissions the FAA requires a functioning certified ADS-B Out device, so don’t miss out on airspace information by not fitting a Trig unit. 

The TT31 uses half the electrical power of the leading competitor transponder, whilst still transmitting at a higher signal power, its efficient design reduces waste heat in the avionics stack and reduces the load on the aircraft electrical system improving overall reliability. The flexible power input means that both 14 and 28 volt systems can be used without special configuration or dropper resistors (we recommend that any dropper resistor fitted for a previous transponder should always be removed). The TT31 is compatible with both parallel and serial altitude encoders; it can even act as a serial altitude repeater to provide a convenient altitude source for your GPS.

All Trig products come with a two year warranty, supported by a network of Approved Trig Dealers. Our U.S. Approved Trig Service Center is based at Mid Continent Instruments and Avionics.


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