1-4
Garmin G500H Pilot’s Guide
190-01150-02 Rev. J
For
ewor
d
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazar
d
Avoidance
Sec 5
Additional Featur
es
Sec 6
Annun. & Alerts
Sec 7
Symbols
Sec 8
Glossary
Appendix A
Appendix B
Index
1.1.1.3
Attitude Heading Reference System (AHRS)
NOTE
: Aggressive maneuvering while 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 G500H 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.
Figure 1-4 AHRS
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 If the IGRF model in the AHRS is out of
date, the user is prompted to update.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 G500H
splash screen is acknowledged on the MFD.
Attitude and heading information is displayed on the PFD when the AHRS
receives appropriate combinations of information from the external sensor
inputs.
AHRS Inputs
AHRS
Mode
AHRS Outputs
GPS
Magnetometer
Air Data
Attitude
Heading
Available
Available
Available/
Unavailable
Normal
Available
Available
Available
Unavailable
Available
No Mag
Available
GPS Track
Available
Unavailable
Unavailable No Air/
No Mag
Available
GPS Track
Unavailable
Available
Available
No GPS
Available
Available
Summary of Contents for G500H
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