Part #:

Model: TT22


Trig Avionics


Remote Mount ADS-B Transponder (Class 1)

Part Number :


  • Smallest & lightest Class 1 Mode S general aviation transponder
  • Remote Mount 2 Part System: consisting of panel controller & transponder box
  • Based on the design & technology of the TT21 Mode S Transponder, with higher transmitted output power 
  • Designed for High Performance Aircraft
  • 250 Watts Nominal Output 
  • Class 1 Transponder is suitable for aircraft cruising faster than 175 knots, and above 15,000 feet, VFR or IFR 
  • Total weight just over 1 lb
  • Minimal Panel Space, can be installed in standard 2¼" or 45mm cut-out
  • Simple Installation
  • Control includes an integrated altitude encoder
  • Controller acts as a configuration module for the system - easily swap transponder box without reprogramming
  • Fully certified and compliant with all transponder requirements TSO approved for European & FAA registered aircraft
  • Supports 1090 MHz Automatic Dependent Surveillance Broadcast (ADS-B out)
  • NOTE:  Image shown above includes TC20 control.  See different system PNs available.


Type: Class 1 Mode S Level 2els, ADS-B Class B1S Supply Voltage: 9 - 33V DC
Certification: ETSO C88a, C112C, C166A & TSO C88b, C112c, C166b Compliance: ED-73C, DO-160F, DO-178B level B, DO-254 level C, DO-260B, DO-181D
Altitude: 35,000 feet Humidity: tested to Cat A in DO-160F
Operating Temp: -40 to +70°C Transponder; -25 to +70°C Controller Transmitter Frequency: 1090MHz ± 1MHz
Typical Current Consumption (14V): idle: 0.15 A, active: 0.34 A Transmitter Power: 250 W nominal; 125 W minimum
Receiver Frequency: 1030 MHz Receiver Sensitivity: -74dBm ± 3dB
Transponder Weight: 0.8 Lbs  Transponder Dimensions: 1.8"H x 2.6"W x 6.2" L (in tray)
Control Unit Weight: 0.11 Lbs Control Unit Dimensions: 1.8"H x 2.4"W x 2.1"L  
Cooling Requirement: No fan required    
Part Number Transponder Description:
00772-00 Complete System w/ Control
00746-00-01 Complete System w/o Control


- Remote Transponder (Unit only)
Price Condition Status
- Remote Transponder
Price Condition Status
- Mode S Transponder
Price Condition Status
- Mode S Transponder (R/T Only)
Price Condition Status
- Remote ADS-B Transponder Kit
Price Condition Status
- Remote Mode S Transponder Sys (Class 1)
Price Condition Status
- ADS-B Bundle w/ TA70 Antenna (System)

NSN: 5310-00-989-3412

Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

Automatic Dependent Surveillance-Broadcast (ADS-B) is a component of the Next-Generation (Next Gen) Air Transportation System. ADS-B is an advanced surveillance technology that combines an aircraft's positioning source (GPS), aircraft avionics, and a ground infrastructure to create an accurate surveillance interface between the aircraft & aircraft traffic control. ADS-B provides consistent position accuracy regardless of the aircraft's range from the receiver.

The improved accuracy and update rate of ADS-B is a critical segment of the NextGen infrastructure.

The FAA has determined that it will be necessary for all aircraft operating in specific airspaces to be equipped with ADS-B Out by 2020. A nationwide infrastructure of ground stations is scheduled for completion during 2013.

As of June 2010, only ADS-B Out is being mandated. ADS-B Out provides the ATC with real-time position information. ADS-B In is the aircraft's ability to receive and display other aircraft broadcasted information as well as the services provided by the ground stations.

ADS-B requires the use of a Positioning Source. As of June 2010, any positioning source is allowed; however, WAAS is the only positioning service that provides the equivalent availability required.

A Broadcast Link is also required for ADS-B functionality. There are two available options: 1090 MHz Extended Squitter (ES) or Universal Access Transceiver (UAT). FL 180 (the lower boundary of Class A airspace) is the ceiling for operating an aircraft equipped with UAT only.

ADS-B will eventually provide weather services, air traffic information, terrain maps and other flight information services for all pilots through satellite based data and ground stations. In accordance with NextGen, ADS-B will provide benefits that address some shortcomings over other, existing surveillance systems.

Some of these benefits include:
  • Air-to-air surveillance capability
  • Surveillance in remote areas where radar coverage is unavailable
  • Real-time traffic information for aircraft not equipped with active traffic systems (ex. TCAS, TAS)
  • Reduced separation between aircraft due to sharing of flight information between aircraft
  • Better predictability in departure and arrival times

    Ultimately, ADS-B will allow aircraft to fly at safe distances from each another.

Click Here to View the official FAA NextGen Final Rule released on 5/28/10.

You may also View an SEA Summary of the FAA NextGen Final Rule (NOTE: this information has been altered for summary purposes and should be used as Reference Only).

Although some manufacturers call out specific transponder antennas in their installation manuals, almost any transponder antenna can be used with any transponder. Various models are available based on the screw hole pattern desired and the speed & drag considerations based on the aircraft type.

For smaller general aviation aircraft, Southeast Aerospace recommends the stub type AV-22 or CI-101 antenna.



For medium to larger aircraft, Southeast Aerospace recommends the blade type CI-105 or AV-74 antenna.


Ultimately, it is the responsibility of the installer or installing agency to determine what antenna is suitable for the aircraft application.




First of all, your equipment should be properly installed with setup, including transponder & GPS. Next, you must be receiving a signal. Finally you should check to make sure your software has been upgraded to version 1.4 or 1.3. If everything is functioning properly, you are receiving a signal & have the proper software - TIS should be working.

If you software has not been upgraded, please contact Southeast Aerospace for your free software upgrade.

For additional trouble shooting, please contact SEA.

For additional trouble shooting, please contact SEA.
Click here to find the answer.
While the TT21 is certified to TSO C166B, the TT21 is a Class 2 transponder and therefore does not meet the power output requirements for FAA transponder and ADS-B regulations. Currently, the FAA requirement for United States airspace is that ADS-B Out is in conjunction with a Class 1 transponder. Other ADS-B environments (ex. Europe and Australia) do not require a Class 1 transponder.

It is recommended that TT21 owners transition to the higher power, Class 1 TT22 to fully comply with the FAA ADS-B performance requirements.
The Mode S aircraft identification code is listed on AC Form 8050-3, Certificate of Aircraft Registration, as the International Civil Aviation Organization (ICAO) Aircraft Address Code. If the aircraft registration does not contain this information, aircraft owners with a Mode S transponder can obtain an aircraft identification code from the FAA Aircraft Registry in Oklahoma City, Oklahoma. This may be accomplished by writing to the following FAA address:

Federal Aviation Administration
Aircraft Registration Branch AFS-750
P.O. Box 25504
Oklahoma City, OK 73125-0504

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