CERTIFICATION APPROVAL: TSO Authorization

COMPLIANCE: Optional: except as noted below, the modification is at the owner/operator’s discretion. Mandatory: for installations that include GNS 480 (CNX80) units interfaced to GTX 33ES/330ES units.

SYSTEM: GNS 480 (CNX80) with Garmin Part No. 430-6100-8xx-xxx.

PURPOSE: This Service Bulletin announces the availability of new GNS 480 (CNX80) Software Version 2.4 and GPS/WAAS Software Version 5.1.

GNS 480 (CNX80) Software Version 2.4 contains of the following new capabilities and features:

Adds support for the GNS 480 to be used as a position source for AC 20-165 compliant ADS-B Out operation of the GDL 88
Adds a new configuration option to the transponder interface menu when the GNS 480 is used as a position source for AC 20-165 compliant ADS-B Out operation of the GTX 33ES/330ES transponder
Corrects an issue that could cause the GNS 480 to perform a system reset when interfaced to a GTX 33ES/330ES transponder
Adds support for new GTX 33ES installer configuration items
Adds support for advisory vertical guidance on LP approaches (LP +V)
Corrects an issue where on some VOR approaches the GNS 480 could load the wrong frequency into the standby position
Corrects the issue, addressed in SA 1047 and IB 1048, in which CDI (Course Deviation Indicator)/HSI (Horizontal Situation Indicator) scaling on a limited number of LNAV/VNAV and LNAV+V approaches was incorrect. The affected LNAV/VNAV and LNAV+V approaches, which have been selectable as LNAV-only approaches in the interim, can now be selected as LNAV/VNAV or LNAV+V