Skip navigation links
Unsupported Browser Detected – For best results, please update your browser.

Aviation Alerts and Advisories

Service Alert 1456: VNAV Zero Foot Altitude Constraint

All G900X, G950, G1000, Cirrus Perspective®, and Embraer Prodigy™ with GDU software versions 13.01 to 13.07, and 14.00 to 14.03, and all G2000/3000/5000 and Embraer Prodigy Touch™ with GDU software versions 2.10 to 3.50, and 4.00 to 4.10 are affected by this alert.

The issue occurs with flight plans that contain an ILS approach with a hold leg at the final approach fix (FAF) waypoint. If the hold leg is removed from the flight plan by the pilot, the published VNAV altitude constraint for the remaining FAF waypoint is changed to a VNAV altitude constraint of zero feet. FMS (Flight Management System) vertical guidance is then provided to the zero feet altitude constraint at the FAF.

To avoid the issue described above the pilot must accomplish either of the following:

  • Disable VNAV when flying to the FAF waypoint on an affected ILS approach after the hold leg has been removed from the flight plan.


  • Load the vectors transition for the approach after the hold leg has been removed from the flight plan.

Garmin has corrected this behavior in G2000/3000/5000 GDU software versions 3.55 and 5.00, and G1000 GDU software versions 13.08, 14.04, and 15.00.

Download 1456A