Air Data Computer; Attitude Heading Reference System - Garmin G500 Pilot's Manual

1.1.1.2

Air Data Computer

The Air Data Computer (ADC) compiles information from the Pitot-static
system and an Outside Air Temperature (OAT) sensor. The ADC provides
pressure altitude, airspeed, vertical speed, and OAT information to the
G500/G600 system. The ADC communicates with the GDU 620 and AHRS
using an ARINC 429 digital interface.
1.1.1.3

Attitude Heading Reference System

NOTE: Aggressive maneuvering while the AHRS is not operating in normal
mode may degrade AHRS accuracy.
The Attitude and Heading Reference System (AHRS) unit provides aircraft
attitude information to the G500/G600 display. The unit contains advanced
accelerometers and rate sensors and interfaces with both the ADC and the
GMU 44 magnetometer. The AHRS utilizes GPS data forwarded from the
GDU 620. Attitude and heading information is sent to the GDU 620 using an
ARINC 429 digital interface.
The International Geomagnetic Reference Field (IGRF) model is contained
in the AHRS and is updated once every five years. The IGRF model is part of
the Navigation Database. At system power-up, the IGRF models in the AHRS
and the Navigation Database are compared. If the IGRF model in the AHRS is
out of date, the user is prompted to update. The prompt will appear after the
G500/G600 splash screen is acknowledged on the MFD.
190-00601-02 Rev. J
Figure 1-4 Air Data Computer
Figure 1-5 AHRS
Garmin G500/G600 Pilot's Guide
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