Part #: 010-00188-12

Model: GTX-327




Digital Transponder

Part Number :

GTX 327
  • Solid-state Mode C digital transponder
  • TSO certified
  • Solid-state transmitter provides 200 watts nominal power output
  • Low power consumption, low heat emission, no warm up time
  • Easy-reading DSTN Liquid Crystal Display reverses yellow numbers out of black for optimal viewing
  • Dedicated VFR button allows for quick and easy 1200/VFR squawking
  • Offers timing functions such as flight time and count-up/down times
  • Offers flight level and pressure altitude


TSO Compliance: C74c Class 1A Temperature Range: -20C to +55C
Weight: 2.1 lbs Power Requirements: 11.0 to 33.0 VDC; Max power input: 15 watts
Altitude: 50,000 feet Humidity: 95% @ +55C for 16 hours; 85% @ +38C for 32 hours
Transmitter Frequency: 1090 MHz Transmitter Power: 200 watts nominal
Receiver Sensitivity: -74 dm nominal for 90% replies Mode A Capability: 4096 ident codes
Mode C Capability: 100 foot increments from -1000 to 63,000 feet Dimensions: 8.2"L x 6.25"W x 1.63"H
Part Number: Description:
Please Note: Garmin "010" P/N's are Catalog ONLY
010-00188-03 Catalog System P/N - Black Bezel 
010-00188-12 Catalog System P/N - Gray Bezel
011-00490-00 Unit Only P/N - Black Bezel
011-00490-10 Unit Only P/N - Gray Bezel


- Digital Transponder
Price Condition Status
- Digital Transponder w/ Install Kit
Price Condition Status
- Digital Transponder w/Install Kit (Gray)
Price Condition Status
- Digital Transponder (Gray Bezel)
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.

Garmin has provided Service Advisory 2051 for general recommendations, materials, and supplies to clean and disinfect Garmin products. Otherwise, not following the recommendations could void the warranty.

  • Cleaners containing ammonia will harm the anti-reflective coating on many Garmin aviation display lenses.
  • Disinfectant with a solution of 70% isopropyl alcohol that does not contain ammonia is preferred. Solutions of up to 91% isopropyl alcohol are also acceptable.
  • Clean the display lens using a clean lint-free cloth and a cleaner that is specified as safe for anti-reflective coatings.
  • For other exposed surfaces such as knobs, buttons, and bezels, a damp cloth with soap and water is acceptable.
  • Bleach-based cleaners, ammonia-based cleaners, or other harsh chemicals on any surface are not recommended.
  • Remove all soap/soap residue to prevent buttons and knobs from gumming up or becoming slippery.
  • Many aviation products are not rated as waterproof. Spraying or wetting the units to the extent where moisture could go beyond the exterior surfaces could damage the unit.

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 most cases, if you already have Garmin equipment, the easiest route to comply with ADS-B is to stay with Garmin. Based on what you gave me below, you would need to upgrade your GNS530 to the 530W (WAAS) and replace your GTX327 with the GTX330ES (Extended Squitter). Most shops will give you a trade-in value for the GTX327 and there are some used GTX330ES units out there on the market. This route will make you compliant with the 1090ES part of ADS-B compliance.

Otherwise, if you choose to keep the GTX327 and go with the GDL88 or GDL84 UAT (978 compliance), you will still have to get your GNS530 upgraded to WAAS and then handle some additional considerations.

Yes, the RANGR Lite is meant for owner/operators who do not have an ES (Extended Squitter) upgradeable transponder or WAAS GPS in their aircraft. The less expensive unit (TXL) is Transmit only while the other (XVRL) includes ADS-B In as well which will display (traffic and weather) on the GNS-430 but would be need to be interfaced.

Yes, the GTX-327 utilizes the same mounting rack and mating connector as the GTX-320 and GTX-320A. The GTX-327 offers a few additional features but matches the standard connection pins as the GTX-320 and GTX-320A.

Garmin part numbers beginning with 010 are used by Garmin to identify products as "Shipping Level Part Numbers", Catalog or Kit part numbers. 010 type part numbers do not appear on the actual dataplate for almost all Garmin aviation units.

Garmin part numbers beginning with 011 are the actual unit part numbers, meaning the 011 part numbers are on the dataplate and paperwork of the unit. In most cases, related system accessories within the 010 standard kit and 010 catalog p/n with install kit do have individual 011 part numbers, but are ordered with the single 010 part number that designates a complete kit.

While external suppression should be connected when a GTX-327 is installed into an aircraft with a DME, the GTX-327 suppression input/output is not compatible with the Bendix/King KN-62, KN-64, and KNS-80. These DMEs have an output only suppression port and can be damaged by the GTX-327 mutual suppression output. Therefore, the suppression pin should be left open. If the suppression line is connected between the GTX-327 and above King DME units then the DME will appear to be inoperative, display will be blank and will not transmit.
Yes, anytime a transponder is removed or replaced an altitude correlation between what the transponder is reporting and what is displayed on the altimeter needs to be performed. This is outlined in FAA CFR Part 91.413. This regulation indicates that following any installation or maintenance of a transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E. Furthermore, these references indicate that an integration test between the altitude reporting equipment and transponder system must be conducted.

For complete information, please refer to these FAA regulations or contact Southeast Aerospace Tech Support team at

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.




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.