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(2020) Service Bulletin 2039 Rev B: GTX 3X5(R) main software version 2.54, new GTX 345(R) part numbers and GTX 3X5 NV models, and other misc updates


PRODUCTS AFFECTED:

GTX 335/335R/345/345R (GTX 3X5(R)) units installed using Part 27 AML STC SR02124SE are affected.

CERTIFICATION AUTHORIZATION:

AML STC SR02124SE

COMPLIANCE:

Recommended: Garmin recommends the incorporation of this Service Bulletin at the next scheduled service interval.

PURPOSE:

This STC Service Bulletin provides notification of an update to STC SR02124SE, GTX 3X5(R) Part 27 AML STC, MDL Revision 2.

GTX 3X5(R) main software 2.54 provides the following:

  • Added the ability to accept the magnetic heading from a traffic source to calculate true heading for ADS-B
  • Added automatic enablement of the flight and trip timers whenever the squat switch is inactive for rotorcraft using a squat switch
  • Added ability to connect the GTS via HSDB for GTS 8×0 v4.12, GTS 8×5 v3.12
  • Added text displays NO COMM and EMERGENCY under 7600 and 7700 Squawk codes
  • Added Traffic Audio Cancel/Update and Traffic Audio Mute discretes
  • Fixed an issue that incorrectly decode aircraft length and width values
  • Added GNS format to accept GPS and height above terrain data from a GNS 400W/500W Series device (GTX 335 only)
  • Improved Air/Ground determination logic
  • Improved traffic alerting when on ground or in an airport environment
  • Updated ADS-B out encoding to improve position accuracy
  • Fixed altitude reporting errors when using pressure altitude from a GAE

Other major details of the update include:

  • Updated GTX 3X5 ADS-B software to v3.13
    • Fixes an issue where some ADS-B traffic intruders may not be displayed when over 200 ADS-B intruders are within range

NOTE
Active TCAS surveillance is not affected by this issue.

  • Updated GTX 3X5 GPS software to v7.0
  • Added new GTX 3X5 NV transponder models
  • Added new GTX 345(R) part numbers
  • Approval of G500H TXi interface
  • Approval of GTS 8XX interface over HSDB
  • Approval of passive GPS splitter interface for VFR only helicopters
  • Added new rotorcraft models to the AML

MDL Revision 2 includes an expansion to the AML.  Under this update, the following models were added to STC SR02124SE.

Rotorcraft Make (TCDS Holder) – Airbus Helicopters Deutschland GmbH
Rotorcraft Model Designation – EC135P3, EC135T3
TCDS number – H88EU


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