Garmin G1000 NXi Supplemental Maintenance Manual page 79

Invalid Data Field
HDG FAIL
G1000 Supplemental Maintenance Manual
Textron Nav III Series
190-02128-04
Associate
d LRU(s)
•
Ensure metal objects (tool boxes, power carts, etc.) are not
interfering with the magnetometer and aircraft is not in
hangar, near other buildings, parked over metal drainage
culverts or on hard surfaces that may contain steel
reinforcements
•
Ensure that a cell phone or a device using cell phone
technology is not turned on (even in a monitoring state) in
the cabin.
•
Cycle power after moving aircraft away from metal objects
to determine if metal objects were the source of the
interference. Allow up to five minutes for the heading to
GSU 75
reinitialize.
(if installed)
•
Perform a Magnetometer Interference Test to check for
interference from onboard electrical system components
&
(e.g. NAV lights). Pay particular attention to any new
GMU 44
electrical devices that have been installed since the aircraft
was new. Correct any discrepancies that do not allow this
test to pass before continuing.
•
Ensure GSU 75 and GMU 44 connectors are secure.
•
Check the wiring and any inline connectors between the
GSU and GMU for faults.
•
Recalibrate the GMU 44
•
Load configuration files to the PFD, GIA1, and GIA2
✓
If problem persists replace the GMU 44.
✓
If problem persists, replace the GSU 75.
GSU 75
(if installed)
•
If this message persists longer than five minutes, perform
AHRS calibration procedures as described in Section 7.10.
&
GMU 44
Solution
Page 5-11
Revision 3