The TT31 by Trig is a state-of-the-art, power-efficient Mode S transponder, designed for seamless retrofitting with Bendix King KT76A and KT78A models. With a simple 'plug and play' mechanism, it fits directly into the existing Bendix King tray, ensuring cost-effective upgrades. Besides being the most energy-efficient transponder in the market, the TT31 boasts a user-friendly interface, bright display, flight timer, altitude monitor, and stop-watch features. It supports U.S. TIS traffic service, showcases data on various portable displays, and meets the latest FAA standards for the 2020 ADS-B mandate. As Mode A and C transponders phase out, TT31's advanced Mode S technology, ready for future airspace requirements, makes it a top choice for pilots worldwide.

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

Pilots can buy the TT31 with confidence. Not only is it the easiest upgrade path for their old BK transponder, with a Trig TT31 tray installed the same transponder is mandate ready. 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. This 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.

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 that can alert you of a deviation from your selected altitude. The TT31 includes data link support for the U.S. TIS traffic service, uplinked from approach radars. TIS traffic can be displayed on a variety of portable displays, and coverage includes most US terminal areas.

Mode A and C transponders are now being replaced by Mode S transponders, technology which is optimised for tomorrow’s airspace requirements. Around the world the introduction of ADS-B surveillance technology means the modern transponder has now become the heart of future airspace compliance requirements. Here the TT31 remains the transponder of choice. The TT31 was the world’s first transponder certified to TSO C166b. This is latest FAA standard for the U.S. 2020 ADS-B mandate and demonstrates Trig’s advanced levels of compliance.