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Aviation Alerts and Advisories

Service Advisory 20109 Rev B: Erroneous GPS position and momentary false TAWS alerts

REVISION B:

Added the G1000(H) NXi

PRODUCTS AFFECTED:

All SBAS-enabled Garmin Integrated Flight Decks (G900X, G950, G1000(H) G1000(H) NXi, Cirrus PerspectiveTM, Embraer ProdigyTM, G2000, G3000, G5000, and Embraer Prodigy® Touch systems), GTN Xi Series, GPS 175, GNX 375, GNC 355, GNS 400W/500W Series, GNS 480, GTN 6XX/7XX Series products operating within the area (depicted in the Service Advisory linked below) are affected.

ISSUE:

Affected Garmin equipment may periodically experience GPS position errors for approximately six seconds, and momentary TAWS false alerts when utilizing corrections from the Japanese MSAS (MTSAT Satellite Augmentation System) space-based augmentation system.

ACTION:

Disable MSAS.

NOTE
Refer to the applicable pilot’s guide for instructions on how to disable MSAS.

RESOLUTION:

MSAS will be disabled automatically in the November 2020 aviation database cycle. A future software and database update will address the issue and re-enable the use of MSAS in the affected products.

Service Advisory 20109 Rev B