Picture of product GTX-325

Part #: 010-01083-01

Model: GTX-325



Part Number :

  • GTX 325 offers a number of useful timing and display functions
  • Timers include trip time, flight time, count-up and count-down, while display functions include readouts for density and pressure altitude as well as static (outside) air temperature
  •  Its solid-state design works to maximize service life and assure dependable ATC traffic surveillance
  • Modern, digital Mode C transponder designed for aircraft that fly in airspace where ADS-B isn’t required or on aircraft that is equipped with a UAT ADS-B solution
  • Offers useful timing and display functions such as timers, altitude monitoring, current pressure altitude readout and more
  • Quick replacement for existing transponders, with common 1.65” tall form factor
  • Optional Garmin altitude encoder simplifies installation, saves space and reduces potential service expenses should the transponder need to be removed
  • Connects to GTN series navigators for transponder code selection and control
  • The GTX 325 transponder can also be paired with an optional Garmin altitude encoder to satisfy Mode C data transmission requirements for IFR
  • The external Garmin altitude encoder mounts separately on the install rack
  • Solid state transmitter (more efficient, longer life): yes
  • Aural alerts: yes
  • Total air temperature (TAT): yes
  • Pressure altitude readout: yes
  • Altitude monitor function: yes
  • Density altitude readout: yes
  • Built-in timers: yes
  • Automatic ALT/GND mode: yes
  • Pressure altitude encoder module (mounts to connector backplate): Optional



weight:  (unit, rack, connectors)  2.9 lbs (1.32 kg) Dimensions: depth is measured from face of instrument panel: 1.68” x 6.30” x 10.07” (42 x 160 x 256 mm)
display type: Digital Voltage range: 14/28 VDC (14 W max)
transmit power: 200 W minimum temperature: -40° C to +70° C
operating altitude: To 55,000 ft (16,800 m) environment compliance: (TSO Approved)  DO-160G
software compliance: (TSO Approved) DO-178 Levels B, C, D hardware compliance: (TSO Approved)  DO-254 Level C; TSO compliance (Approved): TSO-C88b (w/opt. alt. encoder); TSO-C74d
mount type:  Panel transponder type: Mode A/C
squawk code selection:  Push-button cooling input: Not required



Part Number: Description:
010-01083-01 Standard Kit / Catalog Part Number
011-02974-00    Unit Only Part Number


- Mode C 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 questions@seaerospace.com

No. While the GTX-325 is a Mode C transponder replacement for the Mode C GTX-327, they have different connectors.  The GTX-325 uses a 62 pin high-density connector while the GTX-327 has a standard 25 pin D-sub type connector.


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.