Pilot's Guide

1-8
Garmin G500H Pilot’s Guide
190-01150-02 Rev. F
Foreword
Sec 1
System
Sec 2
PFD
Sec 3
MFD
Sec 4
Hazard
Avoidance
Sec 5
Additional
Features
Sec 6
Annun.
& Alerts
Sec 7
Symbols
Sec 8
GlossaryAppendix A
Appendix B
Index
will continue to provide attitude and heading information to the PFD as long as
magnetometer and airspeed data are available and valid.
If the magnetometer input fails, the AHRS continues to output valid attitude
information and GPS Track information is used; however, the heading display
on the PFD is flagged as invalid with a red “X,” “TRK” in magenta is annunciated
to the right of the Track value, and the Track value color is changed from white
to magenta.
NOTE: In this case the magnetic standby compass and GPS ground track
can be used to keep the aircraft on the desired heading.
Note that SVT is turned off in “track-based reversionary mode” and must be
manually re-enabled when heading is restored. Also, map orientations change
from HDG UP to TRACK UP and must be manually changed back after heading
is restored.
When heading fails the heading bug is not removed and the GDU continues
driving the autopilot heading error output using track in place of heading.
Track Mode Active
SVT Is Turned Off
When Heading
Fails
Heading Failed
Figure 1-10 Track Mode shown as Active when Heading Info has failed
Failure of the air data input has no effect on the AHRS output while AHRS is
receiving valid GPS information. Invalid or unavailable airspeed data in addition
to complete GPS failure results in loss of all attitude and heading information.
NOTE: Fastest AHRS alignment is achieved with the aircraft stationary
and with all AHRS inputs valid (3-D GPS position, magnetometer, and
air data). During initial power up on the ground, no GPS position and/or
magnetic anomalies are common. If the aircraft is taxied prior to AHRS
alignment, alignment may be delayed until after a valid 3-D GPS position
is available.