190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 5-11
Table 5-7 Post-Install Procedures Troubleshooting
Annunciated Fault
Possible Cause
Corrective Action
ERROR – Error
occurred while
starting
<procedure
name>
The GRS 79H or GSU 75H
experienced a mode swap error
(i.e., sensor is not in configuration
mode to perform the post-install
procedure).
• Ensure 60 seconds has passed from
navigating from the Main Menu to the
AHRS Menu and rerun procedure.
• Cycle power to the sensor.
Cannot start
<procedure name>
until aircraft is
stationary
Aircraft is not stationary.
• Ensure aircraft is stationary.
• Ensure GPS has an unobstructed view
of the sky.
• Ensure the GRS 79H or GSU 75H is
not subject to excessive vibration.
• Rerun procedure.
Timeout occurred
while starting
<procedure name>
AHRS did not respond for test/
procedure before internal timeout.
• Cycle power to the GRS 79H or
GSU 75H and ensure 60 seconds has
passed from navigating from the Main
Menu to the AHRS Menu and rerun
procedure.
Unable to begin
<procedure name>
AHRS did not respond with correct
calibration procedure reply.
• Cycle power to the GRS 79H or
GSU 75H and ensure 60 seconds has
passed from navigating from the Main
Menu to the AHRS Menu and rerun
procedure.
Timeout occurred
while completing
<procedure name>
AHRS did not reply
complete
for
the test/procedure before timeout.
• Ensure the GRS 79H or GSU 75H is
receiving valid GPS and Magnetometer
(
green check
).
• Cycle power to unit and retry
procedure.