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(2023) Service Bulletin 22114 Rev A: GPS 175/GNX™ 375/GNC® 355 Main Software Version 3.20 and GNX 375 Transponder Board Software Version 2.80

PRODUCTS AFFECTED:

GPS 175, GNC 355, and GNX 375 products listed below with Main Software Version 3.12 and earlier are affected:

NOTE
The software installation procedure documented in this bulletin can be used to load Main Software Version 3.20.

Table 1. Products Affected

ModelAppliance P/N
 GPS 175011-04377-00
 GNX 375011-04378-00
 GNC 355011-04956-00
 GNC 355A011-04956-30


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 22114 is recommended for the models listed in Table 1.


PURPOSE:

GPS 175/GNX 375/GNC 355 Main Software Version 3.20 contains the following changes:

NOTE
Systems with GTN (v6.72 or earlier) or GPS 175/GNC® 355/GNX™ 375 (v3.20 or earlier) interfaced to G500(H)/G600/G700 TXi (v3.50 or later) or GI 275 (v2.60 or later) no longer support database sync. Databases will need to be loaded onto each G500(H)/G600/G700 TXi and/or GI 275 unit separately. This limitation will be fixed in future GTN and GPS 175/GNC 355/GNX 375 software versions.

  • Added support to use Fuel data from G500(H)/G600/G700 TXi and GI 275 EIS units on the Fuel Planning Page
  • Added support for the following RS-232 Fuel formats for fuel data to display on the Fuel Planning Page:
    • FADC Format 1
    • Fuel Format 1
    • Fuel Format 2
  • Flight plan waypoints that are used for transitions are now displayed in gray text on the flight plan page
  • Route waypoint types have been expanded to include fly-over waypoints
  • User waypoint were expanded to support user airports
  • Added Crossfill support for sharing flight plan information between two Garmin navigators: GPS 175, GNC 355, GNX 375, GTN (v6.72), and GTN Xi (v20.30)
  • Added support GPS 175 and GNC 355 to receive ADS-B traffic and weather data from a GNX 375
  • On GNX 375 OAT user data fields now display when OAT temp probe is installed
  • Fixed an issue where users were receiving “ABORT APPROACH” messages when flying LNAV+V approaches
  • Fixed an issue with Label 100 in GAMA output formats to allow GDU 620 to change the CDI from GPS to VOR
  • Fixed an issue with tuning the GNC 355 COM radio from the G3XT. The MapMx Format 2 interface now sends the correct COM channel spacing value
  • Expanded flight plan feature to allow removing a hold at the final approach fix
  • Improved the accuracy of the internal AHRS processing for calculating attitude (pitch and roll) provided to a portable electronic device


WARRANTY INFORMATION:

This modification is reimbursable under the original Garmin factory warranty.

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