All GTS 8X0 (GTS 800/GTS 820/GTS 850) units with software version 4.12 (or earlier) and interfaced to a GTN 6XX/7XX, GNS 4XX(W)/5XX(W), GNS 480, G500, G500H, G600, GMX 200, MX20, or other 3rd party flight display system are affected by this bulletin.
The current GTS 8X0 software version can be viewed by using the GTS 8X0 Install Tool (refer to the Modification Instructions section of this bulletin), on the software label adjacent to the GTS 8X0 serial number tag (for installations unable to electronically display the software part number), or on the display for those units interfaced through HSDB (e.g. GTN 6XX/7XX, G500, G500H, and G600).
Optional: This Service Bulletin may be incorporated at the owner’s discretion and is not warranty reimbursable.
GTS 8X0 software version 4.13 includes the following enhancements:
- Improves magnetic variation calculation by using the internal Magnetic Variation Database when all other sources are invalid
- Improves NAR (Non-Altitude Reporting) intruder bearing calculation
- Improves own ship airborne/on-ground logic