Garmin G3X Pilot’s Guide
190-01115-00 Rev. K
24
System Overview
System
Overview
Flight
Instruments
EIS
CNS
Interface
GPS
Navigation
Flight
Planning
Hazar
d
Avoidance
Additional
Featur
es
AFCS
Annun/Alerts
Appendix
Index
G3X SYSTEM ANNUNCIATIONS
When an LRU or an LRU function fails, a large red ‘X’ is typically displayed over
the instrument(s) or data experiencing the failure (Refer to Appendix F, Abnormal
Operation). Upon G3X power-up, certain instruments remain invalid as equipment
begins to initialize. All instruments should be operational within one minute of power-
up. If any instrument remains flagged, and it is not likely an installation related
problem, the G3X should be serviced by a Garmin-authorized repair facility .
PFD Initialization
AHRS OPERATION
The Attitude and Heading Reference System (AHRS) performs attitude, heading, and
vertical acceleration calculations for the G3X System, utilizing GPS, magnetometer,
and air data in addition to information from its internal sensors. Attitude and heading
information are updated on the PFD while the AHRS receives appropriate combinations
of information from the external sensor inputs.
The AHRS (GSU 73 or GSU 25) corrects for shifts and variations in the Earth’s
magnetic field by applying the Magnetic Field Variation Database. The Magnetic Field
Variation Database is derived from the International Geomagnetic Reference Field
(IGRF). The IGRF is a mathematical model that describes the Earth’s main magnetic
field and its annual rate of change. The database is updated approximately every 5
years. Failure to update this database could lead to erroneous heading information
being displayed to the pilot.
Summary of Contents for G3X Touch
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