Product Description
The TT31 stack transponder has unparalleled installation benefits and class leading performance.
Trig’s TT31 transponder is the ideal retro-fit for the popular Bendix King legacy transponders. The TT31 will ‘plug and play’ straight into an existing KT76A, KT76C and KT78A tray. This significantly reduces both installation time and cost. It provides pilots with Class 1 Mode S technology that is also 1090ES ADS-B Out capable too – to the latest international standard.
The TT31 is compatible with many popular GPS position sources including Garmin GNS and GTN navigators and the Trig TN70. This makes installation flexibility the best in class. A free FAA STC allows the TT31 to be installed as a compliant ADS-B Out solution in 650 aircraft types.
WHAT'S IN THE BOX
- All Trig products come with a two year warranty, starting from the day of installation
- Install manual and Operating manual (in English, German and French)
- Installation kit (including plastic brackets for round mounts)
- Tray
- EASA Form One
FREQUENTLY ASKED QUESTIONS
Why do you call the TT31 the class leader?
The TT31 was also the first transponder in the world to achieve FAA TSO C166b certification. It is the easiest retro-fit transponder on the market for the popular KT76A, KT76C and KT78A. Mode S is 'plug and play' and configurable serial ports enable the fastest ADS-B Out install, using the existing BK tray. The latest TT31 software also provides the widest compatibility with other third party avionics. In use the TT31 is one of the world’s most energy efficient transponders, producing less heat and using less power. This improves the overall reliability of your entire avionics stack.
How does “plug and play” work?
The TT31 has been specifically designed as a slide in replacement for the Bendix King KT76A, KT76C and KT78A. The transponder and can utilise the existing mounting tray, electrical connector and antenna connector.
The TT31 is also “plug and play” with the KT-76C. The mounting tray can sometimes be a snug fit as the size varies depending on the age of the KT-76C unit.
When I buy a TT31 what comes in the box?
When you purchase a TT31 Transponder (complete kit) you will receive the following items: TT31 unit and tray, install kit, installation and user manuals (in English, German and French) and an EASA Form 1. You will need to supply wiring and have an existing or new antenna.
The TT31 can also be ordered as a kit without the Trig tray.
Should I buy a Trig tray with a new transponder?
If your old transponder is a different model than the KT76A, KT76C or KT78A, or if the condition of the tray is in doubt we would recommend that it’s best to buy a TT31 tray.
| Specification | TT31 Transponder |
| Type | Class 1 Mode S Level 2 els |
| Certification | ETSO C166A, 2C112B and TSO-C112, C166b |
| Compliance | ED-73B, DO-160E, DO-178B Level B, DO181C, DO-260B Class B1S, DO-254 Level C |
| Supply Voltage (DC) | 11 – 33 V |
| Typical Current Consumption (at 14V) | idle: 0.22 A, active: 0.45 A |
| Nominal Transmitter Power | 240 W at connector |
| Operating Temperature | -20°C to + 70°C |
| Cooling Requirement | No fan required |
| Weight | 1.35 kg |
| Dimensions | In tray – H 40 x W 160 x L 239 mm |
