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Page 7-20
G1000 System Maintenance Manual
Rev. A
190-00903-00
It is important that all actions are carried out in the order and at the precise elapsed time as
specified in the prepared test sequence. When the operator has completed the actions specified in
the test sequence, press the ENTER button to indicate that the process is complete. When this is
done, the TEST COMPLETE field stops blinking. The PFD informs the operator if the
installation has passed or failed the magnetometer interference test. If the test passes, no further
action is required for this test.
If the test fails, the installation should be considered unreliable until the source of magnetic
interference is identified and remedied. When the magnetometer interference test fails, record the
three magnetometer maximum deviation values and their corresponding timestamps. Any
maximum deviation value greater than 2.5 milliGauss indicates a problem that must be resolved.
Compare the corresponding timestamps with the prepared test sequence to identify which action
produced the problem. Contact Garmin for assistance in resolving the problem.
NOTE
Two common reasons for a failed magnetometer interference test are: 1)
new equipment is installed in close proximity to the GMU 44
magnetometer, and 2) an existing or new electronic device has become
grounded through the aircraft structure instead of via the proper ground
wire in a twisted shielded pair.
Press the ENT key on the PFD to conclude this procedure.
Test
Verify attitude and heading, on PFD in normal mode.
7.1.6
GDC 74B
Original GDC 74B Reinstalled:
No software or configuration loading is required if the original GDC 74B is reinstalled. This
does not include units that were returned for repair as their software and configuration files are
deleted during the repair testing process.
Original GDC 74B(s) Installed in Opposite Locations for Troubleshooting:
If the original GDC 74B #1 and GDC 74B #2 are installed in opposite locations for
troubleshooting, configuration loading is required. Load the following files:
GDC1 Configuration
•
GDC2 Configuration
New or Repaired GDC 74B Installed:
If a new or repaired GDC 74B is installed, load the following files after removing the
Supplemental Database cards from the bottom slots of each display. Note which card was
removed from the MFD so it may be identified later for reinsertion in the MFD when software
and configuration loading is complete. It contains a FliteChart or Chartview database which is
only used by the MFD. Reinstall all the cards after the software and configuration file loads are
complete.
