PRODUCTS AFFECTED:

GTX 3X5(R) units installed using GTX 3XX Part 27 ADS-B AML STC SR02124SE are affected.

CERTIFICATION AUTHORIZATION:

SR02124SE MDL Revision 6

COMPLIANCE:

Recommended: Compliance with Service Bulletin 24078 is recommended at the next scheduled maintenance interval

PURPOSE:

This STC Service Bulletin provides notification of an update to STC SR02124SE, GTX 3X5(R) with ADS-B AML STC, MDL Revision 6.

GTX 3X5 Main Software Version 2.85:

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 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 Daily NOTAM TFRs are now displayed until they are no longer active.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 relative bearing for TAS/TCAS targets. This now matches functionality for ADS-B targets and improves directional callout accuracy for rotorcraft.

WARRANTY INFORMATION:

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