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(2025) Service Bulletin 25006 Rev A: GTX 45R/GTX 345 Transponder Series ADS-B Software Version 3.61
PRODUCTS AFFECTED:
The following GTX 45R/GTX 345 series units are affected:
Table 1. Products Affected
| Model | Appliance P/N |
| GTX 345 | 011-03302-0( ) |
| GTX 345 GPS | 011-03302-4( ) |
| GTX 345R | 011-03303-0( ) |
| GTX 345R GPS | 011-03303-4( ) |
| GTX 345 NV | 011-03302-2( ) |
| GTX 345 NV, GPS | 011-03302-6( ) |
| GTX 345D | 011-04333-00 |
| GTX 345DR | 011-04334-00 |
| GTX 45R | 011-04287-0( ) |
| GTX 45R GPS | 011-04287-4( ) |
CERTIFICATION AUTHORIZATION:
TSO Authorization
TSO authorization does not provide installation airworthiness approval. Separate installation airworthiness approval is required for type certified aircraft. Notification of revision to any Garmin STC(s) will be provided under a separate service bulletin.
COMPLIANCE:
Garmin recommends the incorporation of this TSO Service Bulletin at the next scheduled service interval.
DOCUMENTATION CONSIDERATIONS:
The current revision of the GTX 3X5 Series Pilot’s Guide (Garmin P/N 190-01499-00) Rev H is applicable. Pilot Guides are available at www.garmin.com/manuals.
PURPOSE:
GTX 45R/GTX 345 Transponder Series ADS-B Software Version 3.61 corrects an issue that could result in momentary loss of the ADS-B In function under specific, rare conditions including the presence of a duplicate address aircraft track (1090 MHz) in a high-density traffic environment.
WARRANTY INFORMATION:
This modification is covered under the Garmin factory warranty, with a deadline of August 31, 2025.