TT21 Mode S Transponder Complete Kit

  • Model: 00710-00
  • Shipping Weight: 0.8lbs
  • Units in Stock: 0
  • Manufactured by: Trig Avionics

785.368Ft  600.403Ft
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The TT21 is a two part transponder system, which includes an integrated altitude encoder. In design and technology the TT21 is identical to the TT22; the only difference is that the transmitted output power of the TT21 is lower, qualifying the unit as a Class 2 transponder. Class 2 transponders may be used on aircraft cruising slower than 175 knots, and operating below 15,000 feet, IFR or VFR.

The front panel controller is smaller than a standard instrument, and the remote transponder is not much bigger than a pack of cards. The TT21 can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

  • Low Weight - less than 500 grams!
  • Minimal Panel Space
  • Low Power Consumption
  • 130 Watts Nominal Output
  • Integrated Altitude Encoder
  • Simple Installation
  • Support for 1090ES ADS-B Out

The TT21 can be mounted in a standard 57 mm (2¼ inch) instrument hole, or where space is really tight, in a compact mounting just 42 mm high.

The TT21 is TSO approved for fitting to European and FAA registered aircraft.




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