Software Version 7.04 available for GTX 23, GTX 33(D)(ES)(H), and GTX 330(D)(ES) products (not applicable to G900X, G950, G1000, Cirrus Perspective®, or Embraer Prodigy™ installations)


This bulletin is applicable to GTX 23, GTX 33(D)(ES)(H), & GTX 330(D)(ES) units with Software Version

7.03 or previous software versions not installed in a Garmin Integrated Flight Deck system (G1000, G1000H, G950, G900X, Cirrus Perspective™, and Embraer Prodigy® Integrated Flight Deck Systems). The GTX 330(D)(ES) current software version is displayed at power up, on the unit’s front panel. The GTX 23/ GTX 33(D)(ES)(H) software version is displayed on the remote screen of the controlling LRU GTN) Startup/Self-Test Page.

This Service Bulletin authorizes this software version in the applicable LRU(s). The installer or TC/STC holder (if any) must determine applicability and provide for airworthiness at the installation level in accordance with FAA requirements.


This Service Bulletin incorporates new unit Software Version 7.04 for GTX units. Software Version 7.04 incorporates the below functionality.

  • Ensures proper function of devices connected to the GTX via RS-232
  • Ensures proper initialization of standby mode at power-on when an external standby input is us

The following two items were incorporated in GTX Software Version 7.03 (which is now obsolete), and are also included in GTX Software Version 7.04.

  • Ensures Flight ID changes are properly transmitted to ATC
  • Decreases the time needed to communicate small changes in the horizontal radius of containment.

Mandatory: This Service Bulletin is mandatory only for GTX units with SW v7.01/7.02/7.03 installed. This Service Bulletin must be accomplished by August 15, 2015 or the next scheduled service interval; whichever occurs first.

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35 years component-level Aviation/Electronics repair/Avionics retrofit experience. FCC General Radiotelephone with Ship Radar. Navcom-Audio, Transponder-Pulse-Radar, Autopilot expertise. IT Administration since 1983. Private Pilot since 1986. CAD designer since 1990. FAA Certified Repair Station Chief Inspector since 1994. Started 3 Avionics Shops. College: Business Administration/Marketing. Motorcycle enthusiast. 6 year USAF Veteran, Ground Radio Equipment Technician (30474, E-5). WordPress novice.

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