Part #: 010-00294-01

Model: GTX-33D




Remote Mount Mode S Transponder

Part Number :


  • Remote Mount Mode S Digital Transponder with Diversity
  • Version Options Available - See Part Number Chart below for more Details | See GTX-33 For Complete List
  • IFR certified unit features traffic datalink capability and meets European mandates
    for Mode S Level 2 surveillance
  • Solid-State Design
  • Delivers up to 250 watts of nominal power output
  • Includes remote ident and auto standby, TIS interface, and altitude monitor with voice alerts
  • With available Extend Squitter (ES), versions of the GTX 33 are a pathway to ADS-B compliance for FAA's proposed Next Gen airspace system
  • Certified to TSO-C166a standards for 1090 MHz extended squitter transmission
  • ES works seamlessly with existing ATC protocols
  • All the features of the standard GTX 33 transponder are retained in the ES version
  • Antenna diversity option is available with GTX 33D versions
  • Traffic data enabled by remote GTX 33 system can be displayed graphically on Garmin's integrated GPS/Comm/Nav systems that provide built-in transponder code selection

Dimensions: 6.29"W x 1.78"H x 11.05"D Weight: 3.4 lbs (unit only)
Display Type: Digital Voltage Range: 11-33
Temperature Range: -45°C to +70°C Altitude: 55,000 feet
Transmitter Frequency: 1090 MHz ± 1 MHz Transmitter Power: 125 Watts min, 250 Watts nom
Receiver Frequency: 1030 MHz Receiver Sensitivity: -74 dBm nom for 90% replies
Mode A Capability: 4096 Ident Codes Mode C Capability: 100' increments from -1000 to 62,700'
25' increments from -1000 to 50,175' w/suitable serial data altitude
Mode S Capability: Selective Ident Codes, Aircraft Type External Suppression Input: Low ≤ 0.5V; High ≥ 8V
External Suppresion Output: Output: min +18V (300 ohm load) & max +23V (2000 ohm load) Audio Output: 4.04 Vrms to 7.85 Vrms into 500 ohm load
Power Input: 22 Watts Typical, 45 Watts Max Max Full TSO Reply Rate; 1200 PRF, Code 7777: 1.6A @ 27.5 Vdc, 3.1A @ 13.75 Vdc
Maximum Quiescent: 0.85A @ 27.5 Vdc, 1.1A @ 13.75 Vdc Squawk Code Selection: Remote entry through
CNX 80, GNS 480 or G1000
Solid-State Transmitter: Yes Verbal Alerts: Yes
TIS Alerts Compatible: Yes Outside Air Temperature Display: No
Pressure Altitude Readout:


Altitude Monitor Function: No
Density Altitude Readout: No Built-in Timers: No
Automatic ALT/GND Mode: Yes Diversity: No
Panel-Mounted: No    
Compliance: TSO-C112, Class 2A; RTCA DO-239; ETSO-2c112b, Class 1 Level 2s, Level 2es; TSO-C166a, B0, B1; DO-178B, Level C; DO-254, Level C; ETSO-C166a, B0, B1; ICAO Annex 10, Amendment 77; DO-178B, Level D
Part Number: Description:
010-00294-00 GTX33D Unit Only
010-00294-01 GTX33D and Install Kit 
010-00294-20 GTX33D w/ES (Extended Squitter) Unit Only 
010-00294-21 GTX33D w/ES (Extended Squitter) and Install Kit 
010-00294-40 GTX33DH (Helicopter Version) Unit Only 
010-00294-41 GTX33DH (Helicopter Version) and Install Kit 
010-00294-60 GTX33DH w/ES (Extended Squitter) Unit Only 
010-00294-61 GTX33DH w/ES (Extended Squitter) and Install Kit 
011-00779-01 GTX33D - Item PN*  
011-00779-21 GTX33D w/ES - Item PN*
011-00779-41 GTX33DH - Item PN* 
011-00779-61 GTX33DH w/ES - Item PN* 

*Item PN = Actual PN on Unit - DO NOT USE to Place Order*


- Remote Mount Mode S Transponder
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.

As a dealer for an Original Equipment Manufacturer (OEM), it is required to commit to a dealership agreement. Garmin's dealer agreement states that certain TSO'd products must be installed by the dealer for the factory warranty to be valid. There are generally 2 reasons for this policy. First, the OEM wants to minimize their liability risk by assuring their equipment is installed by factory trained and knowledgeable technicians. Second, Garmin wishes to maintain their products integrity by making sure the product is installed and operating properly so the customer is satisfied with the performance. Avionics installations and interfacing can sometimes be very complex. It is very important that pilots, aircraft owners and operators ensure installations are performed by skilled, experienced technical personnel to provide the safest flying environment and experience.
Newly Overhauled parts obtained from Garmin are designated with an N in their part number. This usually follows the 010- in the part number. As with most Garmin 010 part numbers, the N part numbers are for ordering purposes only and do not actually appear on the dataplate of the unit.
In relation to the transponder technology, a squawk refers to a response that a transmitter responder (i.e. transponder) is making to an interrogation from Air Traffic Control (ATC). In a classic Mode A/C transponder, a squawk response included very basic aircraft ID, general status, and pressure altitude information.

A squitter or squit is a transmission that frequently sends aircraft ID and position data while not being interrogated. In some Mode S transponders and ADS-B devices, the squit transmission can include up to almost 50 parameters including lat/long position, direction of flight, velocity, and more.