Pilot's Guide

190-00663-03 Rev. A Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT/GTi 20
SYSTEM OVERVIEW
10 10
10
10
360‘
10 10
10
10
10 10
10
10
360‘
AHRS
Classical Mode
AHRS
Primary Mode
AHRS
No-Magnetometer Mode
Heading Invalid,
DG Free Mode Available
AHRS
DG Free Mode
Heading Entered by Pilot
GPS Data Available and Reliable?
Mag Data Available & Reliable?Mag Data Available & Reliable?
Manual DG Selection?
10 10
10
10
360‘ 360‘
FREE
Figure 1-14 AHRS Modes (GRS 7800)
GPS inPut FAiluRe
Two GPS inputs are provided to the AHRS. If GPS information from one of the inputs fails, the AHRS
uses the remaining GPS input and an alert message is issued to inform the pilot. If both GPS inputs fail,
the AHRS can continue to provide attitude and heading information to the PFD(s) as long as magnetometer
data is available and reliable (air data will be used to aid calculations during speed changes and extended
turns).
MAGnetoMeteR FAiluRe
If the magnetometer input fails, the AHRS continues to output valid attitude information; however, the
heading output on the PFD(s) is shown in yellow. The pilot can select DG Free mode to provide heading
inputs.
AiR DAtA inPut FAiluRe
Failure of the air data input has no effect on the AHRS output.