Garmin G1000 NAV III Line Maintenance Manual page 155

2. The operator should carry out the actions called for in the prepared test sequence.
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.
3. 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.
4. 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.
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.
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.
5. Press the ENT key on the PFD to conclude this procedure.
4.4.6 Test
Verify attitude and heading, on PFD in normal mode.
If no other maintenance is required, continue to Section 5.
G1000 Nav III Line Maintenance Manual
190-00352-00
NOTE
magnetometer interference
When the
NOTE
test fails, record the three magnetometer
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Rev. L