(2024) Service Bulletin 24042 Rev B: Approval of Part 23 GTX™ 3X5(R) Series Main Software Version 2.85 and ADS-B Software Version 3.51

PRODUCTS AFFECTED:

GTX 3X5(R) Series units installed using Part 23 ADS-B AML STC SA01714WI are affected.

CERTIFICATION AUTHORIZATION:

SA01714WI MDL Revision 23

COMPLIANCE:

Recommended: Compliance with Service Bulletin 24042 is recommended at the next scheduled maintenance interval.

DOCUMENTATION CONSIDERATIONS

As a result of the aircraft modification with this STC, The AFMS, Garmin GTX 33X and GTX 3X5 Transponders with ADS-B, 190-00734-15, Rev. 6 is required to be issued to the aircraft owner/operator before the aircraft is returned to service.

The current revision of the GTX 3X5 Series Pilot’s Guide (Garmin P/N 190-01499-00) Rev G is applicable.

PURPOSE:

This STC Service Bulletin provides notification of an update to STC SA01714WI, GTX 3X5(R) with ADS-B AML STC, MDL Revision 23.

MDL Revision 23 approves the following software changes:

GTX 3X5 Main Software Version 2.85:

• Improved display handling of the alert message dialog subpage
  
• Improvements to the software calibration procedure for units with internal AHRS (GTX 345 only)
  
• Improved the robustness of non-volatile memory data to prevent unit failure due to loss of data
  

CAUTION
Not upgrading software may result in the unit being returned to the factory due to a loss of calibration data.

GTX 3X5 ADS-B Software Version 3.51:

• Improved the AHRS calibration procedure and calibration validity checks
  
• Corrected an issue where assert log information could not be downloaded using HSDB
  
• Expanded support for flight data log retrieval using HSDB
  
• Expanded support for transponder health diagnostic information to be transmitted using HSDB
  
• Expanded support for sourcing of different sensor data for additional systems that have a pilot/copilot flight director transfer switch
  
• Expanded flight data logging capability to include internal AHRS data
  
• Improved the ADS-B SURF application status reporting
  
• Addressed a timing issue that could result in TAS/TCAS-only targets being temporarily removed from the traffic display intermittently
  
• Corrected an issue where daily NOTAM TFRs were only displayed on the first day that they were published. Daily NOTAM TFRs are now displayed until they are no longer active.
  
• Updated aural alert processing to use a heading-based bearing for TAS/TCAS targets. This now matches functionality for ADS-B targets and improves directional callout accuracy primarily for rotorcraft.

WARRANTY INFORMATION:

This modification is warranty reimbursable with a deadline of December 31, 2025.