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Aviation Alerts and Advisories

Service Bulletin 1559: GTN 650 and GTN 750 Notification of Mod Level 5

 All GTN 650 and GTN 750 navigators marked as Mod Level 4 or previous mod level are affected.

 An issue has been identified where the VOR/LOC/GS may stop functioning in the affected units.  This will be indicated by a message on the GTN and the Nav frequencies will be replaced by a red X.

 Service Bulletin 1559 provides instruction to inspect and return affected GTN 650/750 units to Garmin for a Mod Level change.  Service Bulletin 1559 also provides optional instructions for marking Mod Level 5 on the nameplate (serial tag) of unaffected GTN 650/750 units.

 Mandatory for units listed in Table 2 of this bulletin.  This Service Bulletin must be accomplished by October 31st, 2016.
 Optional for units not listed in Table 2.

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