This bulletin is applicable to GTX 327 units with Software Version 2.12 or previous software versions that use a Gillham based altitude encoder, and are not installed in a Garmin Integrated Flight Deck system (G1000, G1000H, G950, G900X, G500, G500H, G600, Cirrus Perspective™, and Embraer Prodigy® Integrated Flight Deck Systems). The GTX 327 current software version is displayed at power up, on the unit’s front panel.
Software version 2.13 addresses an altitude reporting issue when using a Gillham based altitude encoder with GTX 327 (011-00490-00) serial numbers 83750922 to 83752847 or GTX 327 (011-00490-10) serial numbers 84000356 to 84000357. See serial tag on the side of GTX 327 units to determine serial number, or contact local Garmin dealer for assistance.
Recommended: Garmin recommends that this Service Bulletin be incorporated in GTX 327 units (within the serial number ranges listed in the Products Affected section) that have a software version of 2.12 or prior at the owner’s discretion, and is not warranty reimbursable.
This Service Bulletin incorporates new unit software version 2.13 for the GTX 327.