The TT21 is a two-part transponder system, which includes an integrated altitude encoder.
The design and technology are identical to that of the TT22; the only difference is the lower transmit power of the TT21, qualifying it as a Class 2 transponder. These transponders can be used on aircraft with cruising speeds below 175 kt, flying at altitudes below 15000 ft, in VFR or IFR.
The panel controller is smaller than a standard instrument The TT21 can therefore be mounted in even the smallest of aircraft, while remaining a certified unit.
Weight - less than 500 g!
It takes up very little space in the toolbox
Low power consumption
250 Watt rated output
Integrated altitude encoder via static socket
Support for 1090ES ADS-B Out
The TT21 can be mounted in any standard hole for 57 mm instruments or in even more confined spaces: 42 mm in height is enough!
TT21 is TSO approved for European and FAA registered airplanes. b>
The package includes the installation kit.