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(2023) Service Bulletin 23109 Rev A: GPS 175/GNX™ 375/GNC® 355 Main Software Version 3.22 and GNX 375 Transponder Software Version 2.80
PRODUCTS AFFECTED:
GPS 175, GNC 355, and GNX 375 products listed below with Main Software Version 3.21 and earlier are affected:
| Model | Appliance P/N |
| GPS 175 | 011-04377-00 |
| GNX 375 | 011-04378-00 |
| GNC 355 | 011-04956-00 |
| GNC 355A | 011-04956-30 |
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:
Recommended: Compliance with Service Bulletin 23109 is recommended at the next maintenance interval.
DOCUMENTATION CONSIDERATIONS:
The GPS 175/GNX 375/GNC 355 Pilot's Guide (Garmin P/N 190-02488-01) Rev C is applicable.
PURPOSE:
GPS 175/GNX 375/GNC 355 Main Software Version 3.22 contains the following changes:
* Fixed an issue with daily NOTAM-TFRs that were only being shown on the first day they were issued. Now they are displayed until the FIS-B ground system stops providing them.
* Fixed an issue where the traffic output via Bluetooth interface to non-Garmin PED was interrupted when 27 or more traffic targets were present. Now traffic data is always output.
GNX 375 Transponder Software Version 2.80 fixes an issue with transponder related discrete inputs showing as not configured.
WARRANTY INFORMATION:
This modification is warranty reimbursable with a deadline of May 31, 2024.